@string{IEEEMI = "{IEEE Trans. Med. Imag.}"}


@Book{Abramowitz1,
  author =       {Milton Abramitz and Irene A. Stegun},
  title =        "{Handbook of Mathematical Functions}",
  publisher =    {Dover Publications},
  year =         {1972},
  OPTkey =       {},
  OPTeditor =    {},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTseries =    {},
  address =      {New York},
  OPTedition =   {},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Alpert82,
  author =       "{N. M. Alpert et al}",
  title =        "{Estimation of the Local Statistical Noise in
                  Emission Computed Tomography}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      IEEEMI,
  year =         "1982",
  volume =       "MI-1",
  number =       "2",
  pages =        "142-146",
  month =        "Oct.",
  OPTnote =      "",
  OPTannote =    ""
}

@InProceedings{Atal1,
  author =       "{B. S. Atal and J. R. Remde}",
  title =        "{A New Model of LPC Excitation for Producing
                  Natural-Sounding Speech at Low Bit Rates}",
  OPTcrossref =  "",
  OPTkey =       "",
  OPTeditor =    "",
  volume =       "1",
  OPTnumber =    "",
  series =       "{ICASSP}",
  pages =        "614-617",
  booktitle =    "Proceedings of ICASSP",
  year =         "1982",
  organization = "IEEE",
  OPTpublisher = "",
  OPTaddress =   "",
  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}

@Article{Ballard1,
  author =       "{D. H. Ballard}",
  title =        "{Generalizing the Hough Transform to detect
                  arbitrary shapes}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      "Pattern Recognition Letters",
  year =         "1981",
  volume =       "13",
  number =       "2",
  pages =        "111-122",
  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}
                  
@Book{Beta1,
  author =       {Lennart R{\aa}de and Bertil Westergren},
  title =        "{BETA: Mathematics Handbook}",
  publisher =    {Chartwell-Bratt Ltd},
  year =         {1980},
  OPTkey =       {},
  OPTeditor =    {},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTseries =    {},
  OPTaddress =   {},
  OPTedition =   {},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Beylkin1,
  author =       "{Gregory Beylkin}",
  title =        "{Discrete Radon Transform}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      "{IEEE Tr. ASSP}",
  year =         "1987",
  volume =       "35",
  number =       "2",
  pages =        "162-172",
  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}

@Article{Beylkin2,
  author =       {Gregory Beylkin},
  title =        "{The Inversion Problem and Application of the
                  Generalized Radon Transform}",
  journal =      {Communications on Pure and Applied Mathematics},
  year =         {1984},
  OPTkey =       {},
  volume =       {XXXVII},
  OPTnumber =    {},
  OPTmonth =     {},
  pages =        {579-599},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Blake1,
  author = 	 "{A. Blake and A. Zisserman}",
  title = 	 "{Comparison of the Efficiency of Deterministic and
                  Stochastic Algorithms for Visual Reconstruction}",
  OPTcrossref =  "",
  OPTkey = 	 "",
  journal =	 "{IEEE Trans.\ Neural Networks}",
  year =	 "1989",
  volume =	 "11",
  number =	 "1",
  pages =	 "2-12",
  OPTmonth =	 "",
  OPTnote = 	 "",
  OPTannote = 	 ""
}

@Article{Blake2,
  author =       {A. Blake},
  title =        "{Comparison of the Efficiency of Deterministic and
                  Stochastic Algorithms for Visual Reconstruction}",
  journal =      {IEEE Trans.\ Pattern Analysis and Machine Intelligence},
  year =         {1989},
  OPTkey =       {},
  volume =       {PAMI-12},
  OPTnumber =    {},
  OPTmonth =     {},
  pages =        {2-12},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Bluestein1,
  author = 	 "{L. I. Bluestein}",
  title = 	 "{A linear filtering approach to the computation of
		  the discrete Fourier transform}",
  OPTcrossref =  "",
  OPTkey = 	 "",
  journal =	 "NEREM Rec.",
  year =	 "1968",
  OPTvolume = 	 "",
  OPTnumber = 	 "",
  pages =	 "218-219",
  OPTmonth = 	 "",
  OPTnote = 	 "",
  OPTannote = 	 ""
}

@InProceedings{Cabral1,
  author =      "{Brian Cabral, Nancy Cam, and Jim Foran}",
  title =       "{Accelerated Volume Rendering and Tomographic
                  Reconstruction using Texture Mapping Hardware}",
  booktitle =   "{1994 Symposium on Volume Visualization}",
  organization = "ACM SIGGRAPH",
  publisher =    "ACM Press",
  pages =       "91-98",
  month =       "oct",
  year =        "1994",
}
                 
                  
@Article{Canny1,
  author =       "{J. Canny}",
  title =        "{A Computational Approach to Edge Detection}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      "IEEE Trans. PAMI",
  year =         "1986",
  volume =       "8",
  number =       "6",
  pages =        "679-698",
  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}

                  

@Booklet{Carlson1,
  title =        {Fundamentals of Medical Imaging},
  OPTkey =       {},
  author =       {J. Carlson et al},
  howpublished = {Notes for the tutorial course with title
                  Fundamentals of Medical Imaging
                  held at the IEEE Medical Imaging Conference (MIC) 1995.},
  OPTaddress =   {},
  year =         {1995},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}

@PhdThesis{Caroline1,
  author =       {Caroline Axelsson},
  title =        "{Direct Fourier Methods in 3D-Reconstruction from
                  Cone-Beam Data}",
  school =       {Link{\"{o}}bing University},
  year =         {1994},
  OPTkey =       {},
  address =      {Dep. of Electrical Engineering, S-581 83
                  Link{\"{o}}bing, Sweden},
  OPTtype =      {},
  month =        {Jan.},
  note =         {E-mail caroline@isy.liu.se},
  OPTannote =    {}
}
                                   
@Article{Carson1,
  author =       {R. E. Carson and K. Lange},
  title =        "{The EM parametric image reconstruction algorithm}",
  journal =      {Journal of the American Statistical Association},
  year =         {1985},
  OPTkey =       {},
  volume =       {389},
  number =       {80},
  month =        {March},
  pages =        {20-25},
  OPTnote =      {},
  OPTannote =    {}
}

@InProceedings{Censor1,
  author = 	 {Yair Censor},
  title = 	 "{Finite Series-Expansion Reconstruction Methods}",
  OPTcrossref =  {},
  OPTkey = 	 {},
  OPTeditor = 	 {},
  volume =	 {71},
  OPTnumber =	 {},
  OPTseries = 	 {},
  pages =	 {409-419},
  Booktitle =	 {Proc. of the IEEE},
  year =	 {1983},
  OPTorganization = {},
  OPTpublisher = {},
  OPTaddress = 	 {},
  month =	 {March},
  OPTnote = 	 {},
  OPTannote = 	 {}
}

@Article{Chapman1,
  author =       {C. H. Chapman},
  title =        "{Generalized Radon transforms and slant stacks}",
  journal =      {Geophys. J. R. ast. Soc.},
  year =         {1981},
  OPTkey =       {},
  volume =       {66},
  OPTnumber =    {},
  OPTmonth =     {},
  pages =        {445-453},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Chen1,
  author =       {X. Ouyang {\it el al}},
  title =        "{Incorporation of Correlated Structural Images in PET
                  Image Reconstruction}",
  journal =      IEEEMI,
  year =         {1994},
  OPTkey =       {},
  volume =       {13},
  OPTnumber =    {},
  OPTmonth =     {},
  pages =        {627-640},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Cherry93,
  author =       "{S. R. Cherry et al}",
  title =        "{Improved Detection of Focal Cerebral Blood Flow
                  Changes Using Three-Dimensional Positron Emission Tomography}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      "{J. Cereb Blood Flow Metab}",
  year =         "1993",
  OPTvolume =    "",
  number =       "4",
  pages =        "{630--638}",
  OPTmonth =        "",
  OPTnote =      "",
  OPTannote =    ""
}

@Article{Chi1,
  author =       "{C. Y. Chi, J. M. Mendel and D. Hampson}",
  title =        "{A Computationally Fast Approach to
                  Maximum-Likelihood Deconvolution}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      "Geophysics",
  year =         "1984",
  volume =       "49",
  number =       "5",
  pages =        "550-565",
  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}


@Article{Clack1,
  author = 	 "{R. Clack}",
  title = 	 "{Towards a complete description of three-dimensional
		  filtered backprojection}",
  OPTcrossref =  "",
  OPTkey = 	 "",
  journal =	 "Physics in Medicine \& Biology",
  year =	 "1992",
  volume =	 "37",
  number =	 "3",
  pages =	 "645-660",
  month =	 "March",
  OPTnote = 	 "",
  OPTannote = 	 ""
}

@Article{Clack2,
  author = 	 "{R. Clack, D. Townsend and M. Defrise}",
  title = 	 "{An Algorithm for three-dimensional Reconstruction
		  Incorporating Cross-Plane Rays}",
  OPTcrossref =  "",
  OPTkey = 	 "",
  journal =	 IEEEMI,
  year =	 "1989",
  volume =	 "MI-8",
  number =	 "1",
  pages =	 "32-42",
  OPTmonth = 	 "",
  OPTnote = 	 "",
  OPTannote = 	 ""
}

@Article{Cohen1,
  author =       "{L.\ Cohen and I.\ Cohen}",
  title =        "{Finite Element Methods for Active Contour Models
                  and Balloons for 2-D and 3-D Images}",
  journal =      "{IEEE Trans.\ Pattern Analysis and Machine Intelligence}",
  year =         {1993},
  OPTkey =       {},
  OPTvolume =    {PAMI-15},
  OPTnumber =    {},
  OPTmonth =     {},
  OPTpages =     {1133-1147},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Colsher1,
  author = 	 "James G. Colsher",
  title = 	 "{Fully three-dimensional positron emission tomography}",
  OPTcrossref =  "",
  OPTkey = 	 "",
  journal =	 "Physics in Medicine and Biology",
  year =	 "1980",
  volume =	 "25",
  number =	 "1",
  pages =	 "103-115",
  OPTmonth = 	 "",
  OPTnote = 	 "",
  OPTannote = 	 ""
}

@Article{Cookey1,
  author =       "{M. Cookey, H. J. Trussel and I. J. Won}",
  title =        "{Seismic Deconvolution by Multipulse Methods}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      "IEEE Trans. ASSP",
  year =         "1990",
  volume =       "38",
  number =       "1",
  pages =        "156-160",
  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}

@InProceedings{Crandall95,
  author =       "{P. S. Crandall and C. W. Stearns}",
  title =        "{A Scalable Multi Processor Implementation of the
                  Reprojection Algorithm for Volumetric PET Imaging}",
  OPTcrossref =  "",
  OPTkey =       "",
  OPTeditor =    "",
  OPTvolume =    "",
  OPTnumber =    "",
  OPTseries =    "",
  OPTpages =     "",
  booktitle =    "{Conference Record of the IEEE 1995
                  Nuclear Symposium 
                  and Medical Imaging Conference.}",
  year =         "1995",
  OPTorganization = "",
  OPTpublisher = "",
  OPTaddress =   "",
  OPTmonth =     "",
  note =         "In press.",
  OPTannote =    ""
}

@Article{DaubeWitherspoon1,
  author =       {M. Daube-Witherspoon and G. Muehllehner},
  title =        "{Treatment of axial data in threee-dimensional PET}",
  journal =      {J. Nucl. Med.},
  year =         {1987},
  OPTkey =       {},
  volume =       {28},
  OPTnumber =    {},
  OPTmonth =     {},
  pages =        {1717-1724},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{DeGrado1,
  author = 	 "{Timothy R. DeGrado {\it et. al}}",
  title = 	 "{Performance Characteristics of a Whole-Body PET Scanner}",
  OPTcrossref =  "",
  OPTkey = 	 "",
  journal =	 "The Journal of Nuclear Medicine",
  year =	 "1994",
  volume =	 "35",
  OPTnumber = 	 "",
  pages =	 "1398-1406",
  month =	 "August",
  OPTnote = 	 "",
  OPTannote = 	 ""
}

@Article{DeGrado94,
  author =       "{T. R. DeGrado et al}",
  title =        "{Performance Characteristics of a Whole-Body PET Scanner}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      "{J. Nucl. Med.}",
  year =         "1994",
  volume =       "35",
  number =       "8",
  pages =        "{1398--1406}",
  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}



@Book{Deans1,
  author =       {S. R. Deans},
  title =        "{The Radon Transform and Some of Its Applications}",
  publisher =    {Krieger Publishing Company},
  year =         {1993},
  OPTkey =       {},
  OPTeditor =    {},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTseries =    {},
  address =      {Malabar, Florida},
  edition =      {2},
  OPTmonth =     {},
  note =         {Previously John Wiley \& Sons Inc., 1983},
  OPTannote =    {}
}

@Article{Deans2,
  author =       "{S. R. Deans}",
  title =        "{Hough Transform From the Radon Transform}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      "IEEE PAMI",
  year =         "1981",
  volume =       "3",
  number =       "2",
  pages =        "185-188",
  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}

@Article{Defrise1,
  author = 	 "M. Defrise, D. W. Townsend and R. Clack",
  title = 	 "{Three-dimensional image reconstruction from complete
		  projections}",
  OPTcrossref =  "",
  OPTkey = 	 "",
  journal =	 "{Physics in Medicine \& Biology}",
  year =	 "1989",
  volume =	 "34",
  number =	 "5",
  pages =	 "573-587",
  OPTmonth = 	 "",
  OPTnote = 	 "",
  OPTannote = 	 ""
}

@Article{Defrise2,
  author =       {M. Defrise},
  title =        "{A factorization method for the 3D x-ray transform}",
  journal =      {Inverse Problems},
  year =         {1995},
  OPTkey =       {},
  volume =       {11},
  OPTnumber =    {},
  OPTmonth =     {},
  pages =        {983-994},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Deriche1,
  author =       "{R. Deriche}",
  title =        "{Using Canny's Criteria to Derive a Recursively
                  Implemented Optimal Edge Detector}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      "International Journal of Computer Vision",
  year =         "1987",
  volume =       "2",
  number =       "1",
  pages =        "167-187",
  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}

@Article{Diebold1,
  author =       "{John B. Diebold and Paul L. Stoffa}",
  title =        "{The Traveltime Equation, tau-p mapping, and
                  inversion of common midpoint data}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      "{Geophysics}",
  year =         "{1981}",
  volume =       "{46}",
  number =       "{3}",
  pages =        "{238-254}",
  month =        "{March}",
  OPTnote =      "",
  OPTannote =    ""
}

@Book{Dirac1,
  author =       "{P. A. M. Dirac}",
  title =        "{The Principles of Quantum Mechanics}",
  publisher =    "{Oxford University Press, Oxford}",
  year =         "1984",
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}

@Article{Dix1,
  author =       "{C. Hewitt Dix}",
  title =        "{Seismic Velocities from Surface Measurements}",
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  OPTkey =       "",
  journal =      "{Geophysics}",
  year =         "{1955}",
  volume =       "{XX}",
  number =       "{1}",
  pages =        "{68-86}",
  month =        "{Jan.}",
  OPTnote =      "",
  OPTannote =    ""
}

@Article{Duda1,
  author =       "{R. O. Duda and P. E. Hart}",
  title =        "{Use of the Hough Transformation to Detect Lines and
                  Curves in Pictures}",
  OPTcrossref =  "",
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  journal =      "{Communication of the Association for Computing Machinery}",
  year =         "1972",
  volume =       "15",
  number =       "1",
  pages =        "11-15",
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}

@Book{Dudgeon1,
  author =       {Dan E. Dudgeon and Russel M. Mersereau},
  title =        "{Multidimensional Digital Signal Processing}",
  publisher =    {Prentice-Hall},
  year =         {1984},
  OPTkey =       {},
  OPTeditor =    {},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTseries =    {},
  address =      {Englewood Cliffs,N.J},
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  OPTnote =      {},
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}

@Article{Durrani1,
  author =       "{T. S. Durrani and D. Bisset}",
  title =        "{The Radon Transform and its Properties}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      "{Geophysics}",
  year =         "{1984}",
  volume =       "{49}",
  number =       "{8}",
  pages =        "{1180-1187}",
  month =        "{Aug.}",
  note =         "{Correction note in vol. 50, no. 5, pp. 884--886,
                  May 1985}",
  OPTannote =    ""
}

@Article{Edholm1,
  author =       "{P. R. Edholm and G. T. Herman}",
  title =        "{Linograms in Image Reconstruction from Projections}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      IEEEMI,
  year =         "{1987}",
  volume =       "{6}",
  number =       "{7}",
  pages =        "{301-307}",
  month =        "{Dec.}",
  OPTnote =      "",
  OPTannote =    ""
}
                  
                                                    
@Article{Fishbach1,
  author =       {Gerald D. Fishbach},
  title =        "{Mind and Brain}",
  journal =      "{Scientific American}",
  year =         {1992},
  OPTkey =       {},
  volume =       {267},
  number =       {3},
  month =        {September},
  pages =        {24-33},
  OPTnote =      {},
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}

@Article{Fokkema1,
  author =       "{J. T. Fokkema, P. van den Berg and M. Vissinga}",
  title =        "{On the Computation of Radon Transforms of Seismic Data}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      "Journal of Seismic Exploration",
  year =         "1992",
  volume =       "1",
  OPTnumber =    "",
  pages =        "93-105",
  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}

@Article{Foster1,
  author =       "{D. J. Foster and C. C. Mosher}",
  title =        "{Suppression of Multiple Reflections Using the Radon
                  Transform}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      "Geophysics",
  year =         "1992",
  volume =       "57",
  number =       "3",
  pages =        "386-395",
  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}

                  
                  
@Book{Gelfand1,
  author =       {Gel'fand et al},
  title =        "{Generalized Functions}",
  publisher =    {Academic Press},
  year =         {1964},
  OPTkey =       {},
  OPTeditor =    {},
  volume =       {5},
  OPTnumber =    {},
  OPTseries =    {},
  address =      {Baltimore and London second},
  edition =      {2},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}

                  
                  
@Article{Geman1,
  author =       {D. Geman and S. Geman},
  title =        "{Stochastic Relaxation, Gibbs distributions and the
                  Bayesian Restoration of Images}",
  journal =      {IEEE Trans.\ Pattern Analysis and Machine Intelligence},
  year =         {1984},
  OPTkey =       {},
  OPTvolume =    {PAMI-6},
  OPTnumber =    {},
  OPTmonth =     {},
  OPTpages =     {721-741},
  OPTnote =      {},
  OPTannote =    {}
}

@Misc{GeomviewWWW,
  OPTkey =       {},
  author =       {The Geometry Center},
  title =        "{Homepage of The Geometry Center. Authors of Geomview}",
  howpublished = "{\tt http://www.geom.umn.edu}",
  OPTyear =      {},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}

                  
@Book{Golub1,
  author =       {G. H. Golub and C. F. Van Loan},
  title =        "{Matrix Computations}",
  publisher =    {The Johns Hopkins University Press},
  year =         {1991},
  OPTkey =       {},
  OPTeditor =    {},
  volume =       {4},
  OPTnumber =    {},
  OPTseries =    {},
  address =      {Baltimore and London second},
  OPTedition =   {},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}
                  
@Article{Guan1,
  author =       {Huaiqun Guan and Richard Gordon},
  title =        "{A projection access order for speedy convergence of
                  ART (algebraric reconstruction technique): a
                  multilevel scheme for cumputed tomography}",
  journal =      {Phys. Med. Biol.},
  year =         {1994},
  OPTkey =       {},
  volume =       {39},
  OPTnumber =    {},
  OPTmonth =     {},
  pages =        {2005-2022},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{HanLar1,
  author =       "{K. V. Hansen and J. Larsen}",
  title =        "{An Algorithm for Successive Identification of Reflections}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      "{IEEE IP}",
  year =         "1994",
  volume =       "3",
  number =       "3",
  pages =        "281-291",
  month =        "May",
  OPTnote =      "",
  OPTannote =    ""
}

@Article{HanToft1,
  author =       {K. V. Hansen and P. A. Toft},
  title =        "{Fast Curve Estimation Using Pre-Conditioned
                  Generalized Radon Transform}",
  OPTcrossref =  {},
  OPTkey =       {},
  journal =      {IEEE Image Processing},
  year =         {1996},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTpages =     {},
  OPTmonth =     {},
  note =         {To appear in IEEE Image Processing. Preprint
                  Department of MAthematical Modelling,
                  Technical University of Denmark, DK2800 Lyngby},
  OPTannote =    {}
}

@InProceedings{HanToft2,
  author =       "{P. A. Toft and K. V. Hansen}",
  title =        "{Fast Radon Transform for Detection of Seismic Reflections}",
  OPTcrossref =  "",
  OPTkey =       "",
  OPTeditor =    "M.J.J. Holt et al",
  volume =       "I",
  OPTnumber =    "",
  OPTseries =    "",
  pages =        "229-232",
  booktitle =    "Signal Processing VII - Theories and Applications",
  year =         "1994",
  organization = "EURASIP EUSIPCO94",
  OPTpublisher = "",
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  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}

@Article{Haneveld1,
  author =       "{C. J. Haneveld and G. C. Herman}",
  title =        "{A Fast Algorithm for Computation of Radon Transforms}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      "Geophysical Prospecting",
  year =         "1990",
  volume =       "38",
  OPTnumber =    "",
  pages =        "853-860",
  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}

@PhdThesis{Hansen1,
  author =       "{Kim Vejlby Hansen}",
  title =        "{Detection of Primary Reflection Curves in CMP gathers}",
  school =       "{Electronics Institute, Technical University of Denmark}",
  year =         "1994",
  OPTcrossref =  "",
  OPTkey =       "",
  address =      "{Joint work with {\O}degaard \& Danneskiold-Sams{\o}e.}",
  OPTmonth =     "",
  OPTtype =      "",
  OPTnote =      "",
  OPTannote =    ""
}

@Book{Helgason1,
  author =       {Sigurdur Helgason},
  title =        "{The Radon Transform}",
  publisher =    {Birkh{\"a}user},
  year =         {1980},
  OPTkey =       {},
  OPTeditor =    {},
  volume =       {5},
  OPTnumber =    {},
  series =       {Progress in Mathematics},
  address =      {Boston Basel Stuttgart},
  OPTedition =   {},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}

@Misc{HendrixOOGL,
  OPTkey =       {},
  author =       {Technical University of Denmark. Section
                  for Digital Signal Processing},
  title =        "{Home of the OOGL database of 3D objects}",
  howpublished = "{\tt http://hendrix.ei.dtu.dk/oogl/ooglhome.html}",
  OPTyear =      {},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}
                  
@Misc{HendrixWWW,
  OPTkey =       {},
  author =       {Department of mathematical Modelling, Technical
                  University of Denmark. Section for Digital Signal
                  Processing},
  title =        "{Homepage of the danish part of the Human Brain Project}",
  howpublished = "{\tt http://hendrix.ei.dtu.dk}",
  OPTyear =      {},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Herman1,
  author = 	 {Gabor T. Herman and Lorraine B. Meyer},
  title = 	 "{Algebraric Reconstruction Techniques Can Be Made
		  Computationally Efficient}",
  OPTcrossref =  {},
  OPTkey = 	 {},
  journal =	 IEEEMI,
  year =	 {1993},
  volume =	 {12},
  number =	 {3},
  pages =	 {600-609},
  month =	 {Sep.},
  OPTnote = 	 {},
  OPTannote = 	 {}
}

@Book{Herman2,
  author =       {G. T. Herman},
  title =        "{Image Reconstruction from Projections: The
                  fundamentals of Computerized Tomography}",
  publisher =    {Academic Press},
  year =         {1980},
  OPTkey =       {},
  OPTeditor =    {},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTseries =    {},
  OPTaddress =   {},
  OPTedition =   {},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Herman3,
  author =       {G. T. Herman and D. Odhner},
  title =        "{Performance evaluation of an iterative image
                  reconstruction algorithm for positron emission tomography}",
  journal =      IEEEMI,
  year =         {1991},
  OPTkey =       {},
  volume =       {10},
  OPTnumber =    {},
  OPTmonth =     {},
  pages =        {336-246},
  OPTnote =      {},
  OPTannote =    {}
}

@Book{Hertz1,
  author =       {J. Hertz, A. Krogh and R.G. Palmer},
  title =        "{Introduction to the Theory of Neural Computation}",
  publisher =    {Addison Wesley, New York},
  year =         {1991},
  OPTkey =       {},
  OPTeditor =    {},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTseries =    {},
  OPTaddress =   {},
  OPTedition =   {},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}
@InProceedings{Holm95,
  author =       "{S. Holm et al}",
  title =        "{3D PET activation studies with
                  $\mbox{H}_2^{\phantom{2}15}\mbox{O}$ bolus injection.
                  Count rate performance and dose optimization}",
  OPTcrossref =  "",
  OPTkey =       "",
  OPTeditor =    "",
  OPTvolume =    "",
  OPTnumber =    "",
  OPTseries =    "",
  OPTpages =     "",
  booktitle =    "{Quantification of Brain Function using PET.}",
  year =         "1995",
  OPTorganization = "",
  publisher =    "{Academic Press, San Diego}",
  OPTaddress =   "",
  OPTmonth =     "",
  note =         "In press.",
  OPTannote =    ""
}

@Article{HolmJCBF95,
  author =       "{S. Holm et al}",
  title =        "{Count Rate Performance and Dose Optimization for
                  rCBF with O-15 Water Bolus Injection in the New 3D PET}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      "{J. Nucl. Med.}",
  year =         "1995",
  volume =       "36",
  OPTnumber =    "",
  pages =        "{105P}",
  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}

@InProceedings{HolmToft1,
  author =       "{S{\o}ren Holm Peter Toft and Mikael Jensen}",
  title =        "{Estimation of the noise contributions from Blank,
                  Transmission and Emission scans in PET}",
  OPTcrossref =  "",
  OPTkey =       "",
  OPTeditor =    "",
  OPTvolume =       "",
  OPTnumber =    "",
  OPTseries =       "",
  OPTpages =     "",
  booktitle =    "To appear in proceedings",
  year =         "1995",
  organization = "IEEE MIC",
  OPTpublisher =    "",
  OPTaddress =   "",
  month =        "October",
  OPTnote =      "",
  OPTannote =    ""
}

@Article{HolmToft2,
  author =       "{S{\o}ren Holm, Peter Toft, and Mikael Jensen}",
  title =        "{Estimation of the noise contributions from Blank,
                  Transmission and Emission scans in PET}",
  journal =      "{IEEE Transactions on Nuclear Science}",
  year =         {1996},
  OPTkey =       {},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTmonth =     {},
  OPTpages =     {},
  note =         {Submitted},
  OPTannote =    {}
}

@Misc{Hough1,
  OPTcrossref =  "",
  OPTkey =       "",
  author =       "{P. V. C. Hough}",
  title =        "{A Method and Means for Recognizing Complex Patterns}",
  howpublished = "US Patent: 3,069,654",
  year =         "1962",
  month =        "Dec.",
  OPTnote =      "",
  OPTannote =    ""
}

@Article{Huang1,
  author =       "{K. Y. Huang {\it et al}}",
  title =        "{Image Processing of Seismograms: (A) Hough
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  OPTkey =       "",
  journal =      "Pattern Recognition",
  year =         "1985",
  volume =       "18",
  number =       "6",
  pages =        "429-440",
  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}

@Article{Illingworth1,
  author =       "{J. Illingworth and J. Kittler}",
  title =        "{A Survey of the Hough Transform}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      "{Computer Vision, Graphics, and Image Processing}",
  year =         "1988",
  volume =       "44",
  OPTnumber =    "",
  pages =        "87-116",
  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}

@Manual{JJJPolyr,
  title =        {3D Visualisering},
  OPTkey =       {},
  author =       {Jesper James Jensen},
  organization = {IMM Technical University of Denmark},
  address =      {{\tt ftp://ei/dist/1995/james.3Dvis.ps.Z} and {ftp://ei/dist/Radon/polyr.tar.gz}},
  OPTedition =   {},
  OPTyear =      {},
  OPTmonth =     {},
  note =         {Manual in Danish. A software package called Polyr
                  for converting a volume into a surface mesh has also
                  been made.},
  OPTannote =    {}
}
@Article{Jaffe1,
  author =       {Jules S. Jaffe},
  title =        "{Limited Angle Reconstruction Using Stabilized Algorithms}",
  journal =      IEEEMI,
  year =         {1990},
  OPTkey =       {},
  volume =       {9},
  number =       {3},
  month =        {Sep.},
  pages =        {338-344},
  OPTnote =      {},
  OPTannote =    {}
}

@Book{Jain1,
  author =       {A. K. Jain},
  title =        "{Fundamentals of Digital Image Processing}",
  publisher =    {Prentice Hall},
  year =         {1989},
  OPTkey =       {},
  OPTeditor =    {},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTseries =    {},
  address =      {Baltimore and London second},
  edition =      {2},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}
                  
@Article{Kaczmarz1,
  author = 	 {S. Kaczmarz},
  title = 	 "{Angen{\"{a}}hrte Ausl{\"{o}}sung von Systemen
		  linearer Gleichungen}",
  OPTcrossref =  {},
  OPTkey = 	 {},
  journal =	 {Bull. Int. Acad. Pol. Sci. Lett. A},
  year =	 {1937},
  volume =	 {35},
  OPTnumber = 	 {},
  pages =	 {355-357},
  OPTmonth = 	 {},
  OPTnote = 	 {},
  OPTannote = 	 {}
}
                 
                                   
@InCollection{Kal1,
  author =       {Keikke K{\"a}lvi{\"a}inen et al},
  title =        "{Probabilistic and Non-probalistic Hough Transforms:
                  Overview and Comparations}",
  booktitle =    {Randomized Hough Transform: New Extentions},
  OPTcrossref =  {},
  OPTkey =       {},
  publisher =    {Lappeenranta University of Technology},
  year =         {1994},
  OPTeditor =    {},
  OPTvolume =    {},
  number =       {35},
  series =       {Research Letters},
  OPTchapter =   {},
  OPTtype =      {},
  OPTaddress =   {},
  OPTedition =   {},
  OPTmonth =     {},
  OPTpages =     {},
  note =         {email: Heikki.Kalvianen@lut.fi},
  OPTannote =    {}
}

@InProceedings{Kao1,
  author =       {Chien-Min Kao et al},
  title =        "{Improved Bayesian Image Reconstruction in Positron
                  Emission Tomography}",
  booktitle =    {Conference Issue of IEEE Medical Imaging Conference},
  OPTcrossref =  {},
  OPTkey =       {},
  OPTeditor =    {},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTseries =    {},
  year =         {1995},
  OPTorganization = {},
  OPTpublisher = {},
  OPTaddress =   {},
  OPTmonth =     {},
  OPTpages =     {},
  note =         {To appear},
  OPTannote =    {}
}

@MastersThesis{KatjaToft1,
  author =       "{Katja Blankensteiner og Peter Toft}",
  title =        "{Development and Implementation of a Fast and Robust
                  Algorithm for Estimation of the Generalized Radon
                  Transform for Seismical Signal Processing}",
  school =       "Electronics Institute. Technical
                  University of Denmark",
  year =         "1993",
  OPTcrossref =  "",
  OPTkey =       "",
  OPTaddress =   "",
  OPTmonth =     "",
  note =         "In danish.",
  OPTtype =      "",
  OPTannote =    ""
}

@Article{Kaufman1,
  author =       {Linda Kaufman},
  title =        "{Maximum Likelihood, Least Squares, and Penalized
                  Least Squares for PET}",
  journal =      IEEEMI,
  year =         {1993},
  OPTkey =       {},
  volume =       {12},
  number =       {2},
  month =        {June},
  pages =        {200-214},
  OPTnote =      {},
  OPTannote =    {}
}

@TechReport{Kaufman2,
  author =       {Linda Kaufman and Arnold Neumaier},
  title =        "{Image Reconstruction Through Regularization by
                  Envelope Guided Conjugate Gradients}",
  institution =  {Bell Labs},
  year =         {1993},
  OPTkey =       {},
  OPTtype =      {},
  OPTnumber =    {},
  OPTaddress =   {},
  OPTmonth =     {},
  note =         {Report 11274-94-14},
  OPTannote =    {}
}

@Article{Kaufman3,
  author =       {Linda Kaufman},
  title =        "{Implementing and Accelerating the EM Algorithms for
                  Positron Emission Tomography}",
  journal =      IEEEMI,
  year =         {1987},
  OPTkey =       {},
  volume =       {MI-6},
  number =       {1},
  month =        {march},
  pages =        {37-51},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Kawata1,
  author =       {S. Kawata and O. Nalcioglu},
  title =        "{Constrained iterative Reconstruction by the
                  Conjugate Gradient Method}",
  journal =      IEEEMI,
  year =         {1985},
  OPTkey =       {},
  volume =       {MI-4},
  number =       {2},
  month =        {June},
  pages =        {65-71},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Kinahan1,
  author = 	 "{P. E. Kinahan and J. G. Rogers}",
  title = 	 "{Analytic 3D Image Reconstruction Using All Detected Events}",
  OPTcrossref =  "",
  OPTkey = 	 "",
  journal =	 "IEEE Transactions on Nuclear Science",
  year =	 "1989",
  volume =	 "36",
  number =	 "1",
  pages =	 "964-968",
  month =	 "Feb.",
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  OPTannote = 	 ""
}
                  
@Misc{Kinahan2,
  OPTkey =       {},
  author =       {Paul Kinahan},
  OPTtitle =     {},
  howpublished = {Personal Communication},
  OPTyear =      {},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}

@InProceedings{Kinahan3,
  author =       {Paul E. Kinahan {\it et al}},
  title =        "{A Comparison of Transform and Iterative
                  Reconstruction Techniques for a Volume-Imaging PET
                  Scanner With a Large Axial Acceptance Angle}",
  booktitle =    {Conference Record},
  OPTcrossref =  {},
  OPTkey =       {},
  OPTeditor =    {},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTseries =    {},
  year =         {1994},
  organization = {IEEE Nuclear Science Symposium \& Medical Imaging
                  Conference},
  OPTpublisher = {},
  OPTaddress =   {},
  OPTmonth =     {},
  OPTpages =     {},
  OPTnote =      {},
  OPTannote =    {}
}

@InProceedings{Kinahan4,
  author =       {Paul E. Kinahan and Joel Karp},
  title =        "{Determining when 3D reconstruction methods are
                  required in volume PET imaging}",
  booktitle =    {Conference Record},
  OPTcrossref =  {},
  OPTkey =       {},
  OPTeditor =    {},
  volume =       {2},
  OPTnumber =    {},
  OPTseries =    {},
  year =         {1992},
  organization = {IEEE Nuclear Science Symposium \& Medical Imaging
                  Conference},
  OPTpublisher = {},
  OPTaddress =   {},
  OPTmonth =     {},
  pages =        {904-906},
  OPTnote =      {PMB 39:631-642, 1994},
  OPTannote =    {}
}
                  

                  
@Article{Lam1,
  author =       {Wilson Lam et al},
  title =        "{An Analysis on Quantizating the Hough space}",
  journal =      {Pattern Recognition Letters},
  year =         {1994},
  OPTkey =       {},
  volume =       {15},
  OPTnumber =    {},
  month =        {Nov.},
  pages =        {1127-1135},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Lautsch1,
  author =       {Michael Lautsch},
  title =        "{A Spline Inversion Formula for the Radon Transform}",
  journal =      {SIAM J. Numer. Anal.},
  year =         {1889},
  OPTkey =       {},
  volume =       {26},
  number =       {2},
  OPTmonth =     {},
  pages =        {456-467},
  OPTnote =      {},
  OPTannote =    {}
}

@Book{Lavergne1,
  author =       {Michel Lavergne},
  title =        "{Seismic Methods}",
  publisher =    {Graham \& Trotman Limited},
  year =         {1989},
  OPTkey =       {},
  OPTeditor =    {},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTseries =    {},
  address =      {Sterling House, London},
  edition =      {2},
  OPTmonth =     {},
  note =         {Also at Krieger Inc.},
  OPTannote =    {}
}

@Book{Leavers1,
  author =       "{V. F. Leavers}",
  title =        "{Shape Detection in Computer Vision Using the Hough Transform}",
  publisher =    "Springer-Verlag",
  year =         "1992",
  OPTcrossref =  "",
  OPTkey =       "",
  OPTeditor =    "",
  OPTvolume =    "",
  OPTnumber =    "",
  OPTseries =    "",
  OPTaddress =   "",
  OPTedition =   "",
  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}

@TechReport{LehmannToft,
  author =       "{Peter Toft et al}",
  title =        "{Linux: UNIX for PC}",
  institution =  "Electronics Institute, DTU",
  year =         "1994",
  OPTcrossref =  "",
  OPTkey =       "",
  OPTtype =      "",
  OPTnumber =    "",
  OPTaddress =   "",
  OPTmonth =     "",
  note =         "In danish",
  OPTannote =    ""
}

@Misc{LetsPlayPETWWW,
  OPTkey =       {},
  author =       {Department of Molecular and Medical Pharmacology, UCLA},
  title =        "{Homepage: Let's Play PET}",
  howpublished = "{\tt http://www.nuc.ucla.edu/lpp/lpphome.html}",
  OPTyear =      {},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}
                  
                  
@Article{Lewellen95,
  author =       "{T. K. Lewellen et al}",
  title =        "{Investigations of the Count Rate Performance of
                  General Electric Advance Positron Emission Tomograph}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      "{IEEE Trans. Nucl. Sci.}",
  year =         "1995",
  volume =       "NS-42",
  number =       "4",
  pages =        "{1051--1057}",
  month =        "August",
  OPTnote =      "",
  OPTannote =    ""
}

@InProceedings{LewellenMIC95,
  author =       "{T. Lewellen et al}",
  title =        "{Investigations of the Performance of the General
                  Electric Advance Position Emission Tomograph in 3D mode}",
  OPTcrossref =  "",
  OPTkey =       "",
  OPTeditor =    "",
  OPTvolume =    "",
  OPTnumber =    "",
  OPTseries =    "",
  OPTpages =     "",
  booktitle =    "{Submitted}",
  year =         "1995",
  OPTorganization = "",
  OPTpublisher = "",
  OPTaddress =   "",
  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}

@Article{Lewitt1,
  author = 	 {Robert M. Lewitt},
  title = 	 "{Reconstruction Algorithms: Transform Methods}",
  OPTcrossref =  {},
  OPTkey = 	 {},
  journal =	 {Proc. of the IEEE},
  year =	 {1983},
  volume =	 {71},
  number =	 {3},
  pages =	 {390-408},
  month =	 {March},
  OPTnote = 	 {},
  OPTannote = 	 {}
}

@Article{Lewitt2,
  author =       {Robert M. Lewitt},
  title =        "{Alternatives to voxels for image representation in
                  iterative reconstruction algorithms}",
  journal =      {Phys. Med. Biol.},
  year =         {1992},
  OPTkey =       {},
  volume =       {37},
  number =       {2},
  OPTmonth =     {},
  pages =        {706-716},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Li1,
  author =       "{H. Li, M. A. Lavin and R. J. Le Master}",
  title =        "{Fast Hough Transform: A Hierachical Approach}",
  OPTcrossref =  "",
  OPTkey =       "",
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  year =         "1986",
  volume =       "36",
  OPTnumber =    "",
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}

@Article{Liang1,
  author =       {Piang Liang},
  title =        "{A New and Efficient Transform for Curve Detection}",
  journal =      {Journal of Robotic Systems},
  year =         {1991},
  OPTkey =       {},
  volume =       {8},
  number =       {6},
  OPTmonth =     {},
  pages =        {841-847},
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  OPTannote =    {}
}

@TechReport{LinuxToft,
  author =       "{Peter Toft}",
  title =        "{Anvendelse af Linux}",
  institution =  "Electronics Institute, DTU",
  year =         "1995",
  OPTcrossref =  "",
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  OPTmonth =     "",
  note =         "In danish",
  OPTannote =    ""
}

@Article{Louis0,
  author =       {Alfred K. Louis and Frank Natterer},
  title =        "{Mathematical Problems of Computerized Tomography}",
  journal =      {Proceesings of the IEEE},
  year =         {1983},
  OPTkey =       {},
  volume =       {71},
  number =       {3},
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  pages =        {379-389},
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}

@Article{Mallon1,
  author =       {A. Mallon and P. Grangeat},
  title =        "{Three-dimensional PET reconstruction with
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  journal =      {Physics in Medicine \& Biology},
  year =         {1992},
  OPTkey =       {},
  volume =       {37},
  number =       {2},
  OPTmonth =     {},
  pages =        {717-29},
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  OPTannote =    {}
}

@PhdThesis{Maria1,
  author =       {Maria Magnusson},
  title =        "{The Linogram Method for Image Reconstruction from
                  Projections}",
  school =       {Link{\"{o}}bings tekniska h{\"{o}}gskola},
  year =         {1889},
  OPTkey =       {},
  address =      {Dep. of Electrical Engineering, S-581 83
                  Link{\"{o}}bing, Sweden},
  OPTtype =      {},
  OPTmonth =     {},
  note =         {Revised version 1993},
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}
                  
@Article{Mataj1,
  author = 	 {S. Matej et al},
  title = 	 "{Evaluation of task-oriented performance of several
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  year =	 {1994},
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  pages =	 {355-367},
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@Article{McMechan1,
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  journal =      {Bulletin of the Seismological Society of America},
  year =         {1980},
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@Article{Meikle93,
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}

@Article{Mer1,
  author =       {R. M. Mersereau},
  title =        "{Recovering Multidimensional Signals from their Projections}",
  journal =      {Computer Graphics and Image Processing},
  year =         {1973},
  OPTkey =       {},
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  month =        {Dec.},
  pages =        {179-195},
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}

                  
                  
@InProceedings{Moeller1,
  author =       {P. K. M{\o}ller and H.C. Larsen},
  title =        {Reduction of Dispersive Ground-Roll using Time Delay
                  Spectrometry},
  OPTcrossref =  {},
  OPTkey =       {},
  OPTeditor =    {},
  volume =       {III},
  OPTnumber =    {},
  OPTseries =    {},
  pages =        {101-104},
  booktitle =    {Proceesings of IEEE ICASSP},
  year =         {1992},
  organization = {IEEE},
  OPTpublisher = {},
  OPTaddress =   {},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Moraski1,
  author = 	 "Kevin J. {Moraski and David C. Munson, Jr.}",
  title = 	 "Fast Tomographic Reconstruction Using Chirp-z Interpolation",
  OPTcrossref =  "",
  OPTkey = 	 "",
  journal =	 IEEEMI,
  year =	 "1991",
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  OPTnumber = 	 "",
  OPTpages = 	 "",
  OPTmonth = 	 "",
  OPTnote = 	 "",
  OPTannote = 	 ""
}

                  
@Article{Murphy1,
  author =       {Lesley M. Murphy},
  title =        "{Linear feature detection and enhancement in noisy
                  images via the Radon transform}",
  journal =      {Pattern Recognition Letters},
  year =         {1986},
  OPTkey =       {},
  volume =       {4},
  OPTnumber =    {},
  month =        {Sep.},
  pages =        {279-284},
  OPTnote =      {},
  OPTannote =    {}
}

@Book{Natterer1,
  author =       {Frank Natterer},
  title =        "{The Mathematics of Computerized Tomography}",
  publisher =    {John Wiley \& Sons},
  year =         {1986},
  OPTkey =       {},
  OPTeditor =    {},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTseries =    {},
  OPTaddress =   {},
  edition =      {2},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Nievergelt1,
  author =       {Yves Nievergelt},
  title =        "{Elementary Inversion of Radon's Transform}",
  journal =      {SIAM Review},
  year =         {1986},
  OPTkey =       {},
  volume =       {28},
  number =       {1},
  month =        {March},
  pages =        {79-84},
  OPTnote =      {},
  OPTannote =    {}
}

@Book{NumRes,
  author = 	 "William H. Press {\it et. al}",
  title = 	 "{Numerical Recipes in C}",
  publisher = 	 "Cambridge University Press",
  year = 	 "1992",
  OPTcrossref =  "",
  OPTkey = 	 "",
  OPTeditor = 	 "",
  OPTvolume = 	 "",
  OPTnumber = 	 "",
  OPTseries = 	 "",
  OPTaddress = 	 "",
  edition =	 "2.",
  OPTmonth = 	 "",
  OPTnote = 	 "",
  OPTannote = 	 ""
}

@Article{Older1,
  author = 	 {Julia K. Older and Paul C. Johns},
  title = 	 "{Matrix formulation of computed tomography reconstruction}",
  OPTcrossref =  {},
  OPTkey = 	 {},
  journal =	 {Physics in Medicine \& Biology},
  year =	 {1993},
  volume =	 {38},
  OPTnumber = 	 {},
  pages =	 {1051-1064},
  OPTmonth = 	 {},
  OPTnote = 	 {},
  OPTannote = 	 {}
}

@Article{Ollinger1,
  author =       {John M. Ollinger},
  title =        "{Maximum-Likelihood reconstruction of transmission
                  images in emission computed tomography via the EM 
                  algorithm}",
  journal =      IEEEMI,
  year =         {1994},
  OPTkey =       {},
  volume =       {13},
  number =       {1},
  month =        {March},
  pages =        {89-101},
  OPTnote =      {},
  OPTannote =    {}
}

@Book{Oppenheim1,
  author =       "{A. V. Oppenheim and R. W. Schafer}",
  title =        "{Discrete-Time Signal Processing}",
  publisher =    "{Englewood Cliffs, New Jersey, Prentice-Hall Inc.}",
  year =         "1989",
  OPTcrossref =  "",
  OPTkey =       "",
  OPTeditor =    "",
  OPTvolume =    "",
  OPTnumber =    "",
  OPTseries =    "",
  OPTaddress =   "",
  OPTedition =   "",
  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}

@Article{Orlov1,
  author = 	 "S. S. Orlov",
  title = 	 "{Theory of three dimensional
		  reconstruction. 1. Conditions for a complete set of 
                  projections}",
  OPTcrossref =  "",
  OPTkey = 	 "",
  journal =	 "Sov. Phys. Crystallogr.",
  year =	 "1975",
  volume =	 "20",
  number =	 "3",
  pages =	 "312-314",
  OPTmonth = 	 "",
  OPTnote = 	 "",
  OPTannote = 	 ""
}

@Article{Orlov2,
  author = 	 {S. S. Orlov},
  title = 	 "{Theory of three dimensional
		  reconstruction. The recovery operator}",
  OPTcrossref =  {},
  OPTkey = 	 {},
  journal =	 {Sov. Phys. Crystallogr.},
  year =	 {1975},
  volume =	 {20},
  number =	 {4},
  pages =	 {429-433},
  OPTmonth = 	 {},
  OPTnote = 	 {},
  OPTannote = 	 {}
}
                  
@MastersThesis{PAPJJJ1,
  author =       "{Jesper J. Jensen and Peter A. Philipsen}",
  title =        "{Direkte Methods til rekonstruction af PET billeder}",
  school =       "Electronics Institute. Technical
                  University of Denmark",
  year =         "1995",
  OPTcrossref =  "",
  OPTkey =       "",
  OPTaddress =   "",
  OPTmonth =     "",
  note =         "In danish.",
  OPTtype =      "",
  OPTannote =    ""
}

@MastersThesis{PAPJJJ2,
  author =       "{Jesper J. Jensen}",
  title =        "{Iterative Methoder til rekonstruktion af PET billeder}",
  school =       "Electronics Institute. Technical
                  University of Denmark",
  year =         "1995",
  OPTcrossref =  "",
  OPTkey =       "",
  OPTaddress =   "",
  OPTmonth =     "",
  note =         "In danish.",
  OPTtype =      "",
  OPTannote =    ""
}
                  
@MastersThesis{PAPJJJ3,
  author =       "{Peter A. Philipsen}",
  title =        "{Preprocessering og postprocessering af PET billeder}",
  school =       "Electronics Institute. Technical
                  University of Denmark",
  year =         "1995",
  OPTcrossref =  "",
  OPTkey =       "",
  OPTaddress =   "",
  OPTmonth =     "",
  note =         "In danish.",
  OPTtype =      "",
  OPTannote =    ""
}
                                                     
@Book{PCH1,
  author =       {Per Christian Hansen},
  title =        "{Rank-Deficient and Discrete Ill-Posed Problems}",
  publisher =    {Polyteknisk Forlag, Lyngby, Denmark},
  year =         {1996},
  OPTkey =       {},
  OPTeditor =    {},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTseries =    {},
  OPTaddress =   {},
  OPTedition =   {},
  OPTmonth =     {},
  note =         {Doctoral Dissertation},
  OPTannote =    {}
}

@Misc{PCH2,
  OPTkey =       {},
  author =       {Per Christian Hansen},
  OPTtitle =     {},
  howpublished = {Personal Communication},
  OPTyear =      {},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}
                  
@TechReport{PCH3,
  author =       {Per Christian Hansen},
  title =        "{Regularization Tools; A Matlab Package for Analysis
                  and Solution of Discrete Ill-Posed Problems}",
  institution =  {UNIC},
  year =         {1992},
  OPTkey =       {},
  OPTtype =      {},
  number =       {UNIC-92-03},
  address =      {UNIC, Technical University of Denmark, DK-2800 Lyngby},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}

@Book{PKM1,
  author =       {Peter Koefoed M{\o}ller},
  title =        "{Den hurtige Fouriertransformation (FFT)}",
  publisher =    {Electronics Institute, DTU},
  year =         {1991},
  OPTkey =       {},
  OPTeditor =    {},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTseries =    {},
  OPTaddress =   {},
  OPTedition =   {},
  OPTmonth =     {},
  note =         {In Danish},
  OPTannote =    {}
}

@Article{PToftNORSIG96,
  author =       {Peter Toft},
  title =        "{Detection of Lines with Wiggles using the Radon Transform}",
  journal =      {Submitted to NORSIG'96},
  year =         {1996},
  OPTkey =       {},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTmonth =     {},
  OPTpages =     {},
  note =         {Preprint from Department of Mathematical Modelling,
                  Technical University of Denmark},
  OPTannote =    {}
}
             

@PhdThesis{PToftPhD,
  author =       {Peter Toft},
  title =        "{The Radon Transform - Theory and Implementation}",
  school =       {Department of Mathematical Modelling, Technical
                  University of Denmark},
  year =         {1996},
  OPTkey =       {},
  OPTaddress =   {},
  OPTtype =      {},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}

@Misc{PToftWWW,
  OPTkey =       {},
  author =       {Peter Toft},
  title =        "{Homepage of Peter Toft. Section for Digital Signal
                  Processing IMM}",
  howpublished = "{\tt http://www.ei.dtu.dk/staff/ptoft/ptoft.html}",
  OPTyear =      {},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Pajavic95,
  author =       "{S. Pajavic et al}",
  title =        "{Noise Properties of 3D PET Images}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      "J. Nucl. Med.",
  year =         "1995",
  volume =       "36",
  OPTnumber =    "",
  pages =        "{p. 105 (abstract)}",
  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}

@Book{Papoulis1,
  author = 	 "Athanasios Papoulis",
  title = 	 "{Probability, Random Variables and Stochastic Processes}",
  publisher = 	 "McGraw-Hill",
  year = 	 "1984",
  OPTcrossref =  "",
  OPTkey = 	 "",
  OPTeditor = 	 "",
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  OPTnumber = 	 "",
  OPTseries = 	 "",
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  edition =	 "2.",
  OPTmonth = 	 "",
  OPTnote = 	 "",
  OPTannote = 	 ""
}

@Article{Peterson1,
  author =       {C. Peterson and J.R. Anderson},
  title =        "{A Mean Field Learning Algorithm for Neural Networks}",
  journal =      "{Complex Systems}",
  year =         {1987},
  OPTkey =       {},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTmonth =     {},
  pages =        {995-1019},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Phinney1,
  author =       {Robert Phinney et al},
  title =        "{Transformation and Analysis of Record Sections}",
  journal =      {Journal of Geophysical Research},
  year =         {1981},
  OPTkey =       {},
  volume =       {86},
  number =       {B1},
  month =        {Jan.},
  pages =        {359-377},
  OPTnote =      {},
  OPTannote =    {}
}

@InProceedings{Princen1,
  author =       {J. Princen et al},
  title =        "{A Comparison of Hough Transform Methods}",
  booktitle =    {Third International Conference on Image Processing
                  and its Applications},
  OPTcrossref =  {},
  OPTkey =       {},
  OPTeditor =    {},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTseries =    {},
  year =         {1989},
  organization = {IEE},
  OPTpublisher = {},
  OPTaddress =   {},
  month =        {18-20 July},
  pages =        {73-77},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Princen2,
  author =       {J. Princen et al},
  title =        "{A Formal Definition of the Hough Transform:
                  properties and Relationships}",
  journal =      {Journal of Mathematical Imaging and Vision},
  year =         {1992},
  OPTkey =       {},
  volume =       {1},
  OPTnumber =    {},
  OPTmonth =     {},
  pages =        {153-168},
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}

@Article{Rabiner1,
  author = 	 "{L. R. Rabiner et al}",
  title = 	 "{The Chirp z-Transform Algorithm}",
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@Article{Radon1,
  author =       {J. Radon},
  title =        {\"{U}ber die Bestimmung von Funktionen durch ihre
                  Integralwerte l\"{a}ngs gewisser Mannigfaltigkeiten},
  OPTcrossref =  {},
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  journal =      {Ber. Ver. S\"{a}chs. Akad. Wiss. Leipzig, Math-Phys. Kl.},
  year =         {1917},
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  pages =        {262-277},
  month =        {April},
  note =         {In German. An english translation can be found in
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  OPTannote =    {}
}

@Book{Robinson1,
  author =       "{E. A. Robinson, T. S. Durrani and L. G. Peardon}",
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  year =         "1980",
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@InProceedings{Robinson2,
  author =       "{Enders A. Robinson and Eduard J. Douze}",
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  series =       "Acoustical Imaging",
  pages =        "169-186",
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  year =         "1985",
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@Misc{RoentgenWWW,
  OPTkey =       {},
  OPTauthor =    {Richard Terrass},
  OPTtitle =     {},
  howpublished = {{\tt http://web.wn.net/ricter/web/history.html}},
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@Article{Rogers1,
  author = 	 "{J. G. Rogers, R. Harrop and P. E. Kinahan}",
  title = 	 "{The Theory of Three-Dimensional Image Reconstruction
		  for PET}",
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  journal =	 IEEEMI,
  year =	 "1987",
  volume =	 "MI-6",
  number =	 "3",
  pages =	 "239-243",
  month =	 "September",
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@Book{RosKak1,
  author =       "A. Rosenfeld and A. C. Kak",
  title =        "{Digital Picture Processing}",
  publisher =    "Academic Press",
  year =         "1982",
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@Article{Roth1,
  author =       {M.W. Roth},
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                  Target Recognition}",
  journal =      {IEEE Trans.\ Neural Networks},
  year =         {1990},
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  number =       {1},
  OPTmonth =     {},
  pages =        {28-43},
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@Booklet{Scales1,
  title =        "{Iterative methods for large, sparse, inverse 
                  calculations.}",
  OPTkey =       {},
  author =       {John A. Scales},
  howpublished = {Samizdat Press. Colorado School of Mines},
  address =      {76 Olcott Drive, White River Junction, Vermont 05001},
  year =         {1993},
  month =        {April},
  note =         {Lecture notes},
  OPTannote =    {}
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@Article{Schneider1,
  author =       "{W. A. Schneider}",
  title =        "{The Common Depth Point Stack}",
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  journal =      "{Proceedings of the IEEE}",
  year =         "1984",
  volume =       "72",
  number =       "10",
  pages =        "1238-1254",
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@Article{Shepp1,
  author =       {L. A. Shepp and J. B. Krustal},
  title =        {Computerized tomography: The new medical x-ray technology},
  journal =      {Am. Math. Monthly},
  year =         {1978},
  OPTkey =       {},
  volume =       {85},
  OPTnumber =    {},
  month =        {April},
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@Article{Shepp2,
  author = 	 {L. A. Shepp and Y. Vardi},
  title = 	 {Maximum Likelihood Reconstruction for Emission Tomography},
  OPTcrossref =  {},
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  journal =	 IEEEMI,
  year =	 {1982},
  volume =	 {MI-1},
  number =	 {2},
  pages =	 {113-122},
  month =	 {October},
  OPTnote = 	 {},
  OPTannote = 	 {}
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@Book{Simon1,
  author =       {Simon Boel Pedersen},
  title =        {Signalanalyse III},
  publisher =    {Elektronisk Institut, DTU},
  year =         {1990},
  OPTkey =       {},
  OPTeditor =    {},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTseries =    {},
  OPTaddress =   {},
  OPTedition =   {},
  OPTmonth =     {},
  note =         {In danish},
  OPTannote =    {}
}

@Article{Smith1,
  author =       {Mark F. Smith},
  title =        {Simultaneously Constraining SPECT Activity Estimates
                  With Primary and Secondary Energy Window Projection Data},
  journal =      IEEEMI,
  year =         {1994},
  OPTkey =       {},
  volume =       {13},
  number =       {2},
  month =        {June},
  OPTpages =     {},
  OPTnote =      {},
  OPTannote =    {}
}

@InCollection{Smith2,
  author =       {Mark F. Smith},
  title =        {Generalized Matrix Inverse Reconstruction for SPECT
                  Using a Weighted Singular Value Spectrum},
  booktitle =    {Abstract Book of IEEE Nuclear Science Symposium and
                  Medical Imaging Conference},
  OPTcrossref =  {},
  OPTkey =       {},
  publisher =    {IEEE},
  year =         {1995},
  OPTeditor =    {},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTseries =    {},
  OPTchapter =   {},
  OPTtype =      {},
  OPTaddress =   {},
  OPTedition =   {},
  OPTmonth =     {},
  pages =        {161},
  note =         {Also see the Conference Issue.},
  OPTannote =    {}
}

@Article{Snyder1,
  author =       {Donald L. Snyder et al},
  title =        {Noise and Edge Artifacts in Maximum-Likelihood
                  Reconstruction for Emission Tomography},
  journal =      IEEEMI,
  year =         {1987},
  OPTkey =       {},
  volume =       {MI-6},
  number =       {3},
  month =        {Sep.},
  pages =        {228-238},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Stearns93,
  author =       "{C. W. Stearns and D. Wack}",
  title =        "{A Noise Equivalent Counts Approach to Transmission
                  Imaging and Source Design}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      IEEEMI,
  year =         "1993",
  volume =       "MI-12",
  number =       "2",
  pages =        "287-292",
  month =        "June",
  OPTnote =      "",
  OPTannote =    ""
}

@PhdThesis{StearnsPhD,
  author =       {Charles Stearns},
  title =        "{Accelerated Image Reconstruction For A Cylindrical
                  Positron Tomograph Using Fourier Domain Methods}",
  school =       {Massachusetts Institute of Technology},
  year =         {1990},
  OPTkey =       {},
  OPTaddress =   {},
  OPTtype =      {},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Stoffa1,
  author =       {Paul Stoffa et al},
  title =        {Direct mapping of seismic data to the domain of
                  intercept time and ray parameter - A plan-wave
                  decomposition},
  journal =      {Geophysics},
  year =         {1981},
  OPTkey =       {},
  volume =       {46},
  number =       {3},
  month =        {March},
  pages =        {255-267},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Strother90,
  author =       "{S. C. Strother  et al}",
  title =        "{Measuring PET Scanner Sensitivity: Relating Count
                  Rates to Image Signal-to-Noise Ratios Using Noise
                  Equivalent Counts}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      "{IEEE Trans. Nucl. Sci.}",
  year =         "1990",
  volume =       "NS-37",
  number =       "2",
  pages =        "{783--788}",
  month =        "April",
  OPTnote =      "",
  OPTannote =    ""
}

@Article{Sun1,
  author = 	 "Winston Y. Sun, Stephen E. Derenzo and Thomas F. Budinger",
  title = 	 "{An Adaptive Wiener Filter For PET Based on a Novel
		  Technique For Spectral Estimation}",
  OPTcrossref =  "",
  OPTkey = 	 "",
  OPTjournal = 	 "",
  OPTyear = 	 "",
  OPTvolume = 	 "",
  OPTnumber = 	 "",
  OPTpages = 	 "",
  OPTmonth = 	 "",
  OPTnote = 	 "",
  OPTannote = 	 ""
}

@InCollection{Todd82,
  author =       "{A. E. Todd-Pokropek and P. H. Jarrit}",
  title =        "{The noise characteristics of SPECT systems}",
  OPTcrossref =  "",
  OPTkey =       "",
  booktitle =    "{Computed Emission Tomography}",
  publisher =    "{Oxford University Press, Oxford}",
  year =         "1982",
  editor =       "{P. J. Ell and B. L. Holman}",
  OPTvolume =    "",
  OPTnumber =    "",
  OPTseries =    "",
  OPTtype =      "",
  OPTchapter =   "12",
  pages =        "{361--389}",
  OPTaddress =   "",
  OPTedition =   "",
  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}

@TechReport{Toft1,
  author = 	 "Peter Toft",
  title = 	 "{Radontransformation}",
  institution =  "Electronics Institute, Technical University of Denmark",
  year = 	 "1994",
  OPTcrossref =  "",
  OPTkey = 	 "",
  type =	 "{Lecture Note for DTU course 4235: Advanced Digital
                  Signal Processing}",
  OPTnumber = 	 "",
  OPTaddress =   "",
  OPTmonth = 	 "",
  note =	 "In Danish",
  OPTannote = 	 ""
}

@TechReport{Toft10,
  author =       {Peter Toft},
  title =        {Lynkursus i C},
  institution =  {Elektronisk Institut},
  year =         {1993},
  OPTkey =       {},
  OPTtype =      {},
  OPTnumber =    {},
  OPTaddress =   {},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}

@TechReport{Toft11,
  author =       {Peter Toft},
  title =        {Introduktion til Matlab},
  institution =  {Elektronisk Institut},
  year =         {1993},
  OPTkey =       {},
  OPTtype =      {},
  OPTnumber =    {},
  OPTaddress =   {},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}


@TechReport{Toft12,
  author =       {Peter Toft},
  title =        {Interface til ADSP-2101 board med Watcom C/C++ 9.5},
  institution =  {Elektronisk Institut},
  year =         {1993},
  OPTkey =       {},
  OPTtype =      {},
  OPTnumber =    {},
  OPTaddress =   {},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}
                  
                  
@TechReport{Toft2,
  author = 	 "{Peter Toft}",
  title = 	 "{Using the Inverse Radon transform in PET}",
  institution =  "{Technical University of Denmark, Electronics Institute}",
  year = 	 "1994",
  OPTcrossref =  "",
  OPTkey = 	 "",
  OPTtype = 	 "",
  OPTnumber = 	 "",
  address =	 "{DK2800 Lyngby}",
  OPTmonth = 	 "",
  OPTnote =	 "",
  OPTannote = 	 ""
}

@InProceedings{Toft3,
  author =       "{Peter Alshede Philipsen, Lars Kai Hansen and Peter Toft}",
  title =        "{Mean Field Reconstruction with Snaky Edge Hints}",
  OPTcrossref =  "",
  OPTkey =       "",
  OPTeditor =    "",
  OPTvolume =       "",
  OPTnumber =    "",
  OPTseries =       "",
  OPTpages =     "",
  booktitle =    "{To appear in INVERSE METHODS - Interdisciplinary
                  elements of Methodology, Computation and Application}",
  year =         "1995",
  OPTorganization = "",
  OPTpublisher = "",
  OPTaddress =   "",
  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}

@InProceedings{Toft4,
  author =       "{Peter Alshede Philipsen, Lars Kai Hansen and Peter Toft}",
  title =        "{Mean Field Reconstruction with Snaky Edge Hints}",
  OPTcrossref =  "",
  OPTkey =       "",
  editor =       "Peter Johansen",
  OPTvolume =       "",
  OPTnumber =    "95/17",
  OPTseries =       "",
  OPTpages =     "155-161",
  booktitle =    "{Proceedings fra den Fjerde Danske Konference om
                  M{\o}nstergenkendelse og Billedanalyse}",
  year =         "1995",
  OPTorganization = "",
  publisher =    "DIKU",
  OPTaddress =   "",
  month =        "August",
  OPTnote =      "",
  OPTannote =    ""
}

@InProceedings{Toft5,
  author =       "Peter Toft",
  title =        "{Using the Generalized Radon Transform for Detection
                  of Curves in Noisy Images}",
  OPTcrossref =  "",
  OPTkey =       "",
  OPTeditor =    "",
  volume =       "4",
  OPTnumber =    "",
  OPTseries =    "",
  pages =        "2221-2225",
  booktitle =    "Proceedings",
  year =         "1996",
  organization = "IEEE ICASSP",
  OPTpublisher =  "",
  OPTaddress =   "",
  month =        "May",
  OPTnote =      "",
  OPTannote =    ""
}

@TechReport{Toft6,
  author =       "Peter Toft",
  title =        "{Introduktion til Seismik}",
  institution =  "Electronics Institute, DTU",
  year =         "1994",
  OPTcrossref =  "",
  OPTkey =       "",
  OPTtype =      "",
  OPTnumber =    "",
  OPTaddress =   "",
  OPTmonth =     "",
  note =         "In danish",
  OPTannote =    ""
}

@TechReport{Toft7,
  author =       "Peter Toft",
  title =        "{Reconstruction of CT and PET images}",
  institution =  "Electronics Institute, DTU",
  year =         "1995",
  OPTcrossref =  "",
  OPTkey =       "",
  OPTtype =      "",
  OPTnumber =    "",
  OPTaddress =   "",
  OPTmonth =     "",
  note =         "{Used in the course in Advanced Signal Processing 1995}",
  OPTannote =    ""
}

@TechReport{Toft8,
  author =       "Peter Toft et al",
  title =        "{Introduktion til ADSP-2101 boardet}",
  institution =  "Electronics Institute, DTU",
  year =         "1994",
  OPTcrossref =  "",
  OPTkey =       "",
  OPTtype =      "",
  OPTnumber =    "",
  OPTaddress =   "",
  OPTmonth =     "",
  note =         "In danish",
  OPTannote =    ""
}

@TechReport{Toft9,
  author =       "{Peter Toft}",
  title =        "{RadonAna: A C-based Package for Analytically Based
                  Radon Transformation}",
  institution =  "Electronics Institute, DTU",
  year =         "1995",
  OPTcrossref =  "",
  OPTkey =       "",
  OPTtype =      "",
  OPTnumber =    "",
  OPTaddress =   "",
  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}

@Article{ToftJJJ1,
  author =       {Peter Toft and Jesper James Jensen},
  title =        "{A Very Fast Implementation of 2D Iterative
                  Reconstruction Algorithms}",
  journal =      "{Submitted IEEE Medical Imaging Conference}",
  year =         {1996},
  OPTkey =       {},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTmonth =     {},
  OPTpages =     {},
  OPTnote =      {},
  OPTannote =    {}
}
                  
@Article{ToftJJJ2,
  author =       {Peter Toft and Jesper James Jensen},
  title =        "{Accelerated 2D Iterative Reconstruction}",
  journal =      {Submitted},
  year =         {1996},
  OPTkey =       {},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTmonth =     {},
  OPTpages =     {},
  note =         {Preprint from Department of Mathematical Modelling,
                  Technical University of Denmark},
  OPTannote =    {}
}

@TechReport{ToftPSKH,
  author =       "{Peter Toft og Peter S{\o}ren Kirk Hansen}",
  title =        "{Programmel til {\o}velsen i 4232 med ADSP-2101 boardet}",
  institution =  "Electronics Institute, DTU",
  year =         "1995",
  OPTcrossref =  "",
  OPTkey =       "",
  OPTtype =      "",
  OPTnumber =    "",
  OPTaddress =   "",
  OPTmonth =     "",
  note =         "{In danish. Used to DTU course 4232.}",
  OPTannote =    ""
}


                  
@Article{Townsend1,
  author = 	 {D. W. Townsend et al},
  title = 	 {Three Dimensional Reconstruction of PET Data From a
		  Multi-Ring Camera},
  OPTcrossref =  {},
  OPTkey = 	 {},
  journal =	 {IEEE Trans. Nuclear Science},
  year =	 {1989},
  volume =	 {36},
  number =	 {1},
  pages =	 {1056-1064},
  OPTmonth =	 {},
  OPTnote = 	 {},
  OPTannote = 	 {}
}
                  
@Article{Ursin1,
  author =       {Bj{\o}rn Ursin},
  title =        {Seismic Velocity Estimation},
  journal =      {Geophysical Prospecting},
  year =         {1977},
  OPTkey =       {},
  volume =       {25},
  OPTnumber =    {},
  OPTmonth =     {},
  pages =        {658-666},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Vardi1,
  author =       {Y. Vardi, L. A. Shepp and L. Kaufman},
  title =        "{A Statistical Model for Positron Emission Tomography}",
  journal =      {Journal of the American Statistical Association},
  year =         {1985},
  OPTkey =       {},
  volume =       {80},
  number =       {389},
  month =        {March},
  pages =        {8-37},
  note =         {The pages include comments and discussion by several
                  authors.},
  OPTannote =    {}
}

@InCollection{Wenzel1,
  author =       {Friedemann Wenzel et al},
  title =        {Seismic Modelling in the domain of Intercept Time
                  and Ray Parameter},
  booktitle =    {Selected Papers in Multidemensional Digital Signal
                  Processing},
  OPTcrossref =  {},
  OPTkey =       {},
  publisher =    {IEEE Acoustics, Speech, and Signal Processing Society},
  year =         {1986},
  editor =       {The Multidimensional Signal Processing Society},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTseries =    {},
  OPTchapter =   {},
  OPTtype =      {},
  OPTaddress =   {},
  OPTedition =   {},
  OPTmonth =     {},
  pages =        {377-393},
  OPTnote =      {},
  OPTannote =    {}
}

@Article{Wilson1,
  author = 	 "Donald W. Wilson and Benjamin M. W. Tsui",
  title = 	 "{Noise Properties of Filtered-Backprojection and
		  ML-EM Reconstructed Emission Tomographic Images}",
  OPTcrossref =  "",
  OPTkey =	 "",
  OPTjournal =	 "",
  OPTyear = 	 "",
  OPTvolume = 	 "",
  OPTnumber = 	 "",
  OPTpages = 	 "",
  OPTmonth = 	 "",
  OPTnote = 	 "",
  OPTannote = 	 ""
}

@Article{Xu1,
  author =       "{Lei Xu et al}",
  title =        "{A new curve detection method: Randomized Hough
                  Transform (RHT)}",
  OPTcrossref =  "",
  OPTkey =       "",
  journal =      "Pattern Recognition Letters",
  year =         "1990",
  volume =       "11",
  number =       "5",
  pages =        "331-338",
  OPTmonth =     "",
  OPTnote =      "",
  OPTannote =    ""
}

@Article{Xu2,
  author =       {Xiao-Liang Xu, Jeih-San Liow and Stephen C. Strother},
  title =        "{A Non-Iterative Linear Algebraic Algorithms For
                  Image Reconstruction}",
  journal =      IEEEMI,
  year =         {1993},
  OPTkey =       {},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTmonth =     {},
  pages =        {1198-1200},
  OPTnote =      {},
  OPTannote =    {}
}

@Book{Yilmaz1,
  author =       {\"{O}zdo\u{g}an Yilmaz},
  title =        {Seismic Data Processing},
  publisher =    {Society of Exploration Geophysicists, Tulsa, Oklahoma},
  year =         {1987},
  OPTcrossref =  {},
  OPTkey =       {},
  OPTeditor =    {},
  OPTvolume =    {},
  OPTnumber =    {},
  OPTseries =    {},
  OPTaddress =   {},
  OPTedition =   {},
  OPTmonth =     {},
  OPTnote =      {},
  OPTannote =    {}
}