DocumentCode :
1193740
Title :
Fully three-dimensional reconstruction for a PET camera with retractable septa
Author :
Townsend, David W. ; Geissbuhler, Antoine ; Defrise, Michel ; Hoffman, Edward J. ; Spinks, Terry J. ; Bailey, Dale L. ; Gilardi, Maria-Carla ; Jones, Terry
Author_Institution :
Div. of Nucl. Med., Univ. Hospital, Geneva, Switzerland
Volume :
10
Issue :
4
fYear :
1991
fDate :
12/1/1991 12:00:00 AM
Firstpage :
505
Lastpage :
512
Abstract :
A fully 3-D reconstruction algorithm has been developed to reconstruct data from a 16 ring PET camera (a Siemens/CTI 953B) with automatically retractable septa. The tomograph is able to acquire coincidences between any pair of detector rings and septa retraction increases the total system count rate by a factor of 7.8 (including scatter) and 4.7 (scatter subtracted) for a uniform, 20 cm diameter cylinder. The reconstruction algorithm is based on 3-D filtered backprojection, expressed in a form suitable for the multi-angle sinogram data. Sinograms which are not measured due to the truncated cylindrical geometry of the tomograph, but which are required for a spatially invariant response function, are obtained by forward projection. After filtering, the complete set of sinograms is backprojected into a 3-D volume of 128×128×31 voxels using a voxel-driven procedure. The algorithm has been validated with simulation, and tested with both phantom and clinical data from the 953B
Keywords :
biomedical equipment; cameras; computerised tomography; radioisotope scanning and imaging; 20 cm; PET camera; Siemens/CTI 953B; fully 3D reconstruction; medical diagnostic imaging; nuclear medicine; positron emission tomography; reconstruction algorithm; retractable septa; spatially invariant response function; voxel-driven procedure; Cameras; Detectors; Filtering; Geometry; Imaging phantoms; Positron emission tomography; Reconstruction algorithms; Scattering; Testing; Three dimensional displays;
fLanguage :
English
Journal_Title :
Medical Imaging, IEEE Transactions on
Publisher :
ieee
ISSN :
0278-0062
Type :
jour
DOI :
10.1109/42.108584
Filename :
108584
Link To Document :
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