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

单光子发射计算机断层扫描（SPECT）具有不使用放射性同位素的优点，但由于放射性同位素难以获取和处理，因此SPECT的应用范围广，对放射性同位素的检测具有重要意义。在本研究中，我们建立了1mm的空间分辨率，（FWHM 2.4 mm）空间分辨率，而几mm分辨率是常用的方法，通过使用附着在具有1mm × 1mm横截面的每个闪烁体晶体上的1mm × 1mm光子传感器，而大的闪烁体晶体通过几个光读出，倍增管和入射辐射的位置在通常的方法中被计算为探测到的光子的质量的重力中心。

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.