| Autor: |
R, Adams, J L, Lacy, M E, Ball, L J, Martin |
| Rok vydání: |
1990 |
| Předmět: |
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| Zdroj: |
Journal of nuclear medicine : official publication, Society of Nuclear Medicine. 31(10) |
| ISSN: |
0161-5505 |
| Popis: |
The multiwire gamma camera (MWGC) operates at high count rates with radionuclides of low energy and short half-life. We evaluate the count rate performance of the MWGC with tantalum-178 (178Ta) by a decaying source method. Data acquired dynamically by the camera from a 178Ta source in the NEMA Standards scatter phantom were corrected for deadtime loss by a trial paralyzing deadtime and converted to their natural logarithms. The trial deadtime, tau, was adjusted iteratively after curve fittings until a straight line was achieved. The paralyzing deadtime determined by this method was 0.41 microsecond. Therefore, the camera can be operated up to 850,000 cps with 178Ta without exceeding 50% data loss. This rate is 10 times greater than the performance of the typical scintillation camera. Moreover, high count rates are achieved without significant loss of spatial resolution. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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