The high count rate performance of a two-dimensionally position-sensitive detector for positron emission tomography.

The high count rate performance of a two-dimensionally position-sensitive detector for positron emission tomography.
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用于正电子发射断层扫描的二维位置敏感探测器的高计数率性能。

DOI:
10.1088/0031-9155/34/4/003
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发表时间:
1989
影响因子:
3.5
通讯作者:
Karp,JS
Karp,JS
中科院分区:
工程技术2区
文献类型:
--
作者:
Mankoff,DA;Muehllehner,G;Karp,JS

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To enable the PENN-PET tomograph to perform studies involving high data rates, the high count rate behaviour of the position-sensitive scintillation detector used in the tomograph was investigated at singles rates in excess of 2 million counts per second (MCPS). Detector dead-time, minimised through the use of pulse clipping (clipping time, 120 ns), is a maximum of 20% at the highest data rates. At 2 MCPS and 240 ns pulse integration time, the full width at half maximum of the point spread function (PSF) worsens by approximately 20% over its low count rate value of 5.2 mm. Furthermore, at high count rates, pulse pile-up produces long tails in the PSF along the detector's long axis. These tails were reduced or eliminated through the use of a shortened pulse integration time (160 ns instead of 240 ns), an upper level energy discriminator and a local centroid event positioning algorithm. Detector performance was characterised for different combinations of these event processing techniques, and the mechanisms by which pulse pile-up distorts the high count rate PSF were investigated using computer simulations.
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