K. Erlandsson et al., 3D RECONSTRUCTION FOR A MULTIRING PET SCANNER BY SINGLE-SLICE REBINNING AND AXIAL DECONVOLUTION, Physics in medicine and biology, 39(3), 1994, pp. 619-629
A three-dimensional (3D) image reconstruction method, which was origin
ally developed for a positron emission tomography (PET) system consist
ing of two rotating scintillation cameras, has now been implemented fo
r a multi-ring PET scanner with retractable septa. The method is calle
d 'single-slice rebinning with axial deconvolution' (SSAD), and can be
described as follows. The projection data are sorted into transaxial
2D sinograms. Correction for the axial blurring is made by deconvoluti
on in the sinograms. To obtain the axial spread functions, which depen
d on the activity distribution, 2D reconstruction is first made using
a limited axial acceptance angle. The final 3D image is obtained by 2D
, reconstruction of transaxial planes. The method is simple but not ap
proximate, has a modest memory requirement, and can be combined with d
ifferent 2D techniques. Evaluations by Monte Carlo simulations and pha
ntom studies have been made.