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