1: Cone-Beam and New Geometries Reconstruction -- Comparison of three 3D reconstruction methods from cone-beam data -- Filtered backprojection algorithms for attenuated parallel and cone-beam projections sampled on a sphere -- A theorem on divergent projections -- An adaptative and constrained model for 3D X-ray vascular reconstruction -- Cone-beam algebraic reconstruction using edge-preserving regularization -- Eigen analysis of cone-beam scanning geometries -- Efficient sampling in 3D tomography: parallel schemes -- 2: SPECT Quantitation -- Analytical approaches for image reconstruction in 3D SPECT -- Quantitative brain SPECT in three dimensions: an analytical approach without transmission scans -- An analytical approach of compensation for non-uniform attenuation and 3D detector response in cardiac SPECT imaging -- Characteristics of reconstructed point response in three-dimensional spatially variant detector response compensation in SPECT -- Evaluation of fully 3D iterative scatter compensation and post-reconstruction filtering in SPECT -- An investigation of two approximation methods for improving the speed of 3D iterative reconstruction-based scatter compensation -- 3: Patient Motion and Gated SPECT -- Evaluation of a 3D OS-EM reconstruction algorithm for correction of patient motion in emission tomography -- Space-time Gibbs priors applied to gated SPECT myocardial perfusion studies -- Reconstruction of gated SPECT myocardial images images using a temporal evolution model -- 4: PET Quantitation and Reconstruction -- Design and performance of 3D single photon transmission measurement on a positron tomograph with continuously rotating detectors -- A single scatter simulation technique for scatter correction in 3D PET -- The effect of energy threshold on image variance in fully 3D PET -- FIPI: fast 3-D PET reconstruction by Fourier inversion of rebinned plane integrals -- Performance of a fast maximum likelihood algorithm for fully 3D PET reconstruction -- Author Index.