Basic performance evaluation of a Si-PM array-based LGSO phoswich DOI block detector for a high-resolution small animal PET system.
Basic performance evaluation of a Si-PM array-based LGSO phoswich DOI block detector for a high-resolution small animal PET system.
复制标题
用于高分辨率小动物 PET 系统的基于 Si-PM 阵列的 LGSO phoswich DOI 块探测器的基本性能评估。
DOI：
10.1118/1.4760991
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Hatazawa J.
中科院分区：
文献类型：
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作者：
Yamamoto S;Watabe H;Kato K;Hatazawa J.
目的近年来，高量子效率的光电倍增管（PMT）和位置灵敏光电倍增管（PSPMT）得到了发展。然而，目前还不清楚他们是否真的提高了这样的性能，如能量和空间分辨率的PET和SPECT detectors.MethodsThe作者评估的量子效率（QE）的PMT和PSPMT和测量的能量分辨率的3英寸。圆HQE光电倍增管与各种不同的双折射器相结合，并与传统的正常的量子效率（NQE）的相同类型的光电倍增管的结果进行比较。作者还测量了2英寸的位置和能量性能。方形HQE PSPMT结合闪烁体块，并将其与相同尺寸的NQE PSPMT进行比较。圆形HQE PMT显示出比NQE更高的能量分辨率。对于所有测量，能量分辨率的改善都小于PMT量子效率的预期值，但对于具有较小光输出的双折射器来说更高。HQE PSPMT基于块检测器的能量和位置性能表现出更高的位置和能量性能比那些与NQE.ConclusionsFrom these results，作者得出结论，HQE PMT和PSPMT有助于提高PET和SPECT探测器的能量和位置性能。通过使用HQE PMT或PSPMT，PET和SPECT系统的性能有望得到显著改善。
PurposeRecently, photomultiplier tubes (PMTs) and position sensitive PMTs (PSPMTs) with higher quantum efficiencies (HQE) have been developed. However, it remains unclear whether they actually improve such performances as the energy and spatial resolution for PET and SPECT detectors.MethodsThe authors evaluated the quantum efficiencies (QEs) for PMTs and PSPMTs and measured the energy resolution of a 3‐in. round HQE PMT combined with various scintillators and compared the results with a conventional normal quantum efficiency (NQE) PMT of the same type. The authors also measured the position and energy performance of a 2‐in. square HQE PSPMT combined with scintillator blocks and compared them with a NQE PSPMT of the same size.ResultsThe energy resolution of the 3‐in. round HQE PMT showed higher energy resolution than the NQE with all scintillators. The improvement of the energy resolution was smaller, for all measurements, than the expected value from the quantum efficiency of the PMT but was higher for the scintillators with smaller light outputs. The energy and position performance of the HQE PSPMT based block detectors showed higher position and energy performance than those with NQE.ConclusionsFrom these results, the authors conclude that both HQE PMT and PSPMT contribute to improve the energy and position performance for PET and SPECT detectors. Significant performance improvements will be expected in PET and SPECT systems by the use of the HQE PMTs or PSPMTs.