Advantage of fan beam collimators for contrast recovery of hyperfixation in clinical SPECT
| Autor: | O. de Dreuille, J.L. Stievenart, Bernard Bendriem, André Syrota, M. H. Bourguignon, B. Bok, J.F. Menard, C. Parc, Isabelle Gardin, Pierre Vera |
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| Rok vydání: | 1997 |
| Předmět: |
Physics
Nuclear and High Energy Physics medicine.medical_specialty medicine.diagnostic_test business.industry media_common.quotation_subject Collimator Image processing Single-photon emission computed tomography Imaging phantom law.invention Optics Nuclear Energy and Engineering Sampling (signal processing) law medicine Contrast (vision) Medical physics Statistical analysis Electrical and Electronic Engineering business Beam (structure) media_common |
| Zdroj: | IEEE Transactions on Nuclear Science. 44:83-89 |
| ISSN: | 1558-1578 0018-9499 |
| DOI: | 10.1109/23.554830 |
| Popis: | 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 /sup 99m/Tc, 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/spl deg/, in particular when the contrast is low. The authors also demonstrate that fan beam collimators permit smaller size hyperfixation detection. |
| Databáze: | OpenAIRE |
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