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This book contains a selection of communications presented at the Third International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, held 4-6 July 1995 at Domaine d' Aix-Marlioz, Aix-Ies-Bains, France. This nice resort provided an inspiring environment to hold discussions and presentations on new and developing issues. Roentgen discovered X-ray radiation in 1895 and Becquerel found natural radioactivity in 1896 : a hundred years later, this conference was focused on the applications of such radiations to explore the human body. If the physics is now fully understood, 3D imaging techniques based on ionising radiations are still progressing. These techniques include 3D Radiology, 3D X-ray Computed Tomography (3D-CT), Single Photon Emission Computed Tomography (SPECT), Positron Emission Tomography (PET). Radiology is dedicated to morphological imaging, using transmitted radiations from an external X-ray source, and nuclear medicine to functional imaging, using radiations emitted from an internal radioactive tracer. In both cases, new 3D tomographic systems will tend to use 2D detectors in order to improve the radiation detection efficiency. Taking a set of 2D acquisitions around the patient, 3D acquisitions are obtained. Then, fully 3D image reconstruction algorithms are required to recover the 3D image of the body from these projection measurements.
Table des matières
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.
Résumé
These techniques include 3D Radiology, 3D X-ray Computed Tomography (3D-CT), Single Photon Emission Computed Tomography (SPECT), Positron Emission Tomography (PET).
