Title :
Advantage of fan beam collimators for contrast recovery of hyperfixation in clinical SPECT
Author :
Véra, Pierre ; De Dreuille, Olivier ; Bendriem, Bernard ; Gardin, Isabelle ; Stiévenart, Jean Louis ; Ménard, Jean François ; Parc, C. ; Bourguignon, Michel ; Bok, Bernard ; Syrota, André
Author_Institution :
Dept. of Nucl. Med., Hopital Beaujon, Clichy, France
fDate :
2/1/1997 12:00:00 AM
Abstract :
The influence of the collimator on the contrast recovery of hyperfixation was studied using a dual-headed single photon emission computed tomography (SPECT) system with standard clinical acquisition parameters. Three parallel collimator sets and two fan beam collimator sets were tested with a Jaszczak phantom. The six spheres of the phantom were filled with 99mTc, and four background levels were progressively obtained by adding radioactivity to the cylinder of the phantom, providing four hyperfixation levels. The effects of angular sampling and reconstruction filters have been tested. The statistical analysis was performed with analysis of variance (ANOVA). This study demonstrates the advantage of ultra-high resolution fan beam collimators for contrast recovery of hyperfixation with SPECT when using 64 projections over 360°, in particular when the contrast is low. The authors also demonstrate that fan beam collimators permit smaller size hyperfixation detection
Keywords :
biomedical equipment; single photon emission computed tomography; 99mTc; Jaszczak phantom; Tc; angular sampling; background levels; clinical SPECT; contrast recovery; diagnostic nuclear medicine; hyperfixation; medical instrumentation; parallel collimator sets; radioactivity; reconstruction filters; spheres; statistical analysis; Analysis of variance; Biomedical imaging; Biophysics; Collimators; Filters; Imaging phantoms; Nuclear medicine; Sampling methods; Single photon emission computed tomography; Testing;
Journal_Title :
Nuclear Science, IEEE Transactions on
