Title :
Contrast recovery of hyperfixation in SPECT: interest of fan beam collimators
Author :
Véra, Pierre ; De Dreuille, Olivier ; Bendriem, Bernard ; Gardin, Isabelle ; Stiévenart, Jean Louis ; Paré, Christian ; Bourguignon, Michel ; Bok, Bernard ; Syrota, André
Author_Institution :
Service de Med. Nucl., Hopital Beaujon, Clichy, France
Abstract :
The influence of the collimator on the contrast recovery of hyperfixation was studied in SPECT. With a dual headed SPECT system, three parallel collimators sets and 2 fan beam collimators sets were tested with a Jaszczak´s phantom. The 6 spheres of the phantom were filled with 99mTc and 4 background levels were successively obtained progressively by filling the cylinder of the phantom providing 4 hyperfixation level. The effect of the angular and projection matrix sampling were tested. Using ANOVA, the authors demonstrated higher contrast recovery of hyperfixation when using fan beam collimators. Moreover, this experimental study shows that when using fan beam collimators it is preferable to acquire 64 projections rather than 128 for a chosen fixed acquisition time
Keywords :
biomedical equipment; single photon emission computed tomography; 99mTc; ANOVA; Jaszczak´s phantom; SPECT hyperfixation contrast recovery; Tc; acquisition time; angular sampling; background levels; dual headed SPECT system; fan beam collimators; medical diagnostic imaging; nuclear medicine; phantom spheres; projection matrix sampling; Analysis of variance; Collimators; Conducting materials; Filling; Imaging phantoms; Sampling methods; Signal to noise ratio; Single photon emission computed tomography; System testing; Transmission line matrix methods;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference Record, 1995., 1995 IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-3180-X
DOI :
10.1109/NSSMIC.1995.510456
