RT Journal Article
SR Electronic
T1 Methodology and Performance Assessment of Zoom SPECT
JF Journal of Nuclear Medicine Technology
JO J. Nucl. Med. Technol.
FD Society of Nuclear Medicine
SP 198
OP 203
VO 18
IS 3
A1 Kouris, Kypros
A1 Elgazzar, Abdelhamid
A1 Affana, Raid
A1 Higazi, Ezzat
A1 Awdeh, Maha
A1 Mahmoud, Abdelrahman
A1 Abdel-Dayem, Hussein M.
YR 1990
UL http://tech.snmjournals.org/content/18/3/198.abstract
AB The methodology of zoom single-photon emission computed tomography (Z SPECT) imaging and its performance was assessed using two tomographic gamma cameras, systems A* and B†, fitted with high resolution collimators. The center of rotation (COR) varied linearly for zoom factors (ZF) from 1.0 to 4.0. It was more stable and reproducible in system B and its variation with ZF was significantly smaller. Z SPECT acquisitions were done using projection matrix sizes 64 × 64 and 128 × 128, 64 projections over 360 degrees and ZF equal to 1.0, 1.6 and 2.0. Point source acquisitions demonstrated the superior performance of system B. Two small phantoms were constructed (10 × 10 × 5 cm each) containing cold rods and hot rods. The use of zoom improved both contrast and resolution. The Nowak reconstruction algorithm provided better contrast than the conventional filtered backprojection algorithm. The 2 mm hot rod was visible using system B with projection matrix 64 × 64 and ZF = 1.6. The use of zoom in SPECT leads to improved contrast and resolution; the application of Z SPECT to small organs is recommended.