| Autor: |
R E, Zimmerman, B B, Williams, K H, Chan, S C, Moore, M F, Kijewski |
| Rok vydání: |
1998 |
| Předmět: |
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| Zdroj: |
Journal of nuclear medicine : official publication, Society of Nuclear Medicine. 38(12) |
| ISSN: |
0161-5505 |
| Popis: |
A method for performing scatter corrections that would directly use the photopeak information and would be straightforward for use in clinical practice would be attractive in SPECT imaging. The dual-photopeak window method may be such a method. It relates the scatter fraction to the ratio of the lower to the total parts of a split-photopeak window. We investigated the use of this scatter correction method on a dedicated brain camera.Calibration curves for the Ceraspect, a dedicated brain imaging camera, were obtained for four split-window combinations using point sources in air and water. Simulations of the Ceraspect calibration curves at several energy resolution values were obtained using a Monte Carlo simulation of the instrument.The calibration curves, experimental and simulated, revealed an ambiguous and unstable relationship between lower-to-total ratio and scatter fraction.The unsatisfactory calibration curves can be attributed to the limited scatter produced in a brain-sized phantom during the calibration process and inherent stability problems in the calibration process. The dual-photopeak window method is not usable for small-field imaging systems and may even be unstable for larger-field systems. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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