Next Generation of SPECT using ultra small photon detectors and new type of Scintillators

从体内剂量的同位素中检测辐射光子是一种有效的诊断方法，它可以测量孵化流量，测量组织的新陈代谢等。虽然单光子发射计算机层析成像(SPECT)不使用难以获得和操作的放射性同位素，但空间分辨率仍有提高的空间。在本研究中，我们建立了1 mm(半高宽2.4 mm)的空间分辨率，而通常的方法是在每个具有1 mm x 1 mm截面的闪烁体晶体上安装1 mm x 1 mm的光子传感器，而通常的方法是通过几个光电倍增管读出大的闪烁体晶体，并计算入射辐射的位置作为被探测光子的引力质量中心。

Detection of radiative photons from dosed isotope in a body is efficient way for the diagnosis by measuring brood flow, measuring metabolism of tissues and so on. Although the single photon emission computer tomography (SPECT) has advantage that it does not use radio isotope which is difficult to get and to handle, there is a room to improve the spatial resolution.In this study we established 1 mm (FWHM 2.4 mm) spatial resolution whereas a few mm resolution was usual method, by using a 1 mm x 1 mm photon sensor attached on each scintillator crystal having 1 mm x 1 mm cross-section, whereas a large scintillator crystal is read out by several photo-multiplier tubes and position of incident radiation is calculated as the gravitational center of mass of detected photons in usual methods.