CAJ | 학술논문

采用探测器几何效率推导了高灵敏度SPECT系统的点源扩展函数，指出了考虑探测器晶体厚度修正的必要性，在小型γ相机上用99m Tc的实验结果证明了这一过程，并指出取消准直器在大幅提高灵敏度的同时能够成像的基本根据。在此基础上，讨论了高灵敏度SPECT的灵敏度和空间分辨率，指出了进行小动物成像的可行性；Rose标准的讨论指出灵敏度的大幅提高，明显削弱了背景噪音带来的图像分辨影响，使得动态过程的成像能拥有很好的时间分辨率。
채용탐측기궤하효솔추도료고령민도SPECT계통적점원확전함수，지출료고필탐측기정체후도수정적필요성，재소형γ상궤상용99m Tc적실험결과증명료저일과정，병지출취소준직기재대폭제고령민도적동시능구성상적기본근거。재차기출상，토론료고령민도SPECT적령민도화공간분변솔，지출료진행소동물성상적가행성；Rose표준적토론지출령민도적대폭제고，명현삭약료배경조음대래적도상분변영향，사득동태과정적성상능옹유흔호적시간분변솔。
Geometric efficiency was used to derive the point spread function ( PSF) of a SPECT system which u-ses no collimator .The thickness of the NaI crystal was also considered and a modification of the PSF was made . An experiment with the γcamera was used to support the derivation .It showed that the system had a high sensi-tivity and provided an acceptable image at the same time .Based on above results , the sensitivity and resolution of the no-collimator system was discussed to show the potential of the system in small animal imaging .Then Rose criterion was introduced to show that with a high sensitivity the influence of the noise was weakened and a better time resolution in dynamic imaging was provided .