Investigating the energy resolution of arrays of small scintillation crystals
| Autor: | Ling-Jian Meng, D.J. Herbert, David Ramsden |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Physics
Nuclear and High Energy Physics Scintillation Physics::Instrumentation and Detectors business.industry Detector Resolution (electron density) Photoelectric effect Photodiode law.invention Optics Nuclear Energy and Engineering law Optoelectronics Quantum efficiency Electrical and Electronic Engineering business Image resolution Energy (signal processing) |
| Zdroj: | 2001 IEEE Nuclear Science Symposium Conference Record (Cat. No.01CH37310). |
| DOI: | 10.1109/nssmic.2001.1008474 |
| Popis: | Arrays of small scintillation crystals are being used increasingly for high-resolution imaging applications in nuclear medicine. Although the degree of pixellation now available is high for some scintillation materials, this spatial resolution is often achieved at the expense of degraded energy resolution due to the lower, and more variable, light-collection efficiency. The energy resolution of a detector is, however, especially important in nuclear medicine, where events that have been scattered in the body need to be rejected efficiently. The light output from a range of CsI(Tl) arrays was measured in terms of the number of photoelectrons; detected, using a hybrid photodiode (HPD). This data, used in conjunction with the measured energy resolution and an estimate of the intrinsic energy resolution of CsI(Tl), were used to assess the magnitudes of the various contributions to the overall energy resolution of these detectors. This information suggested that there is an opportunity to improve their energy resolution by carefully choosing the geometry and reflector material to minimize the variance in the light collection. If the nature of this variance is understood sufficiently well, there may be an opportunity to apply a postprocessing technique similar to that that has dramatically improved the performance of other standard scintillation detectors. This possibility depends on the use of either the uniform quantum efficiency of the multipixel HPD photocathodes or a monolithic array of PIN diodes. This would ensure that no additional or indeterminate variance in the light collection is introduced. Measurements made using fine BGO arrays for higher energy applications and columnar grown CsI(Tl) for X-ray imaging will also be presented. |
| Databáze: | OpenAIRE |
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