基于位置灵敏光电倍增管的小型γ相机

Gamma camera based on PSPMT

描述了一套基于位置灵敏光电倍增管（ＰＳＰＭＴ）的小型γ相机系统的建立与测试。该系统由 ＰＳＰＭＴ、整体式 Ｎａｌ（Ｔｌ）晶体、平行孔铅准直器和电子学系统构成，其对５７Ｃｏ （１２２ｋｅＶ）江源 γ射线的能量分辨率为２７％；对于２ｍｍ直径铅准直孔的空间分辨率（ＦＷＨＭ）约为４ｍｍ。测试结果表明，这种γ相机在小视野放射性显影方面与传统γ相机相比有其优越性。

A. r .camera based on Position Sensitive Photomultiplier Tube (PSPMT) has been set up and tested. The system comprised a PSPMT, a plane NaI(T1) crystal, a parallel collimator and DAQ system. The energy resolution for 57Co (122keV) wad 27%, and the spacial resolution (FWHM.) was ~ 4mm for 2mm diameter aperture. The result showed that this type of gamma camera was superior to the standard anger camera.