An electronically collimated gamma camera for single photon emission computed tomography. Part II: Image reconstruction and preliminary experimental measurements.
An electronically collimated gamma camera for single photon emission computed tomography. Part II: Image reconstruction and preliminary experimental measurements.
复制标题
用于单光子发射计算机断层扫描的电子准直伽马相机。
DOI：
10.1118/1.595314
复制
发表时间：
1983
期刊：
影响因子：
3.8
通讯作者：
Doria,D
中科院分区：
文献类型：
--
作者：
Singh,M;Doria,D
本文研究了一种基于电子准直γ射线方法的新型γ照相机的数据重建迭代算法。相机由两个探测系统组成，它们记录所发射的伽马辐射的顺序相互作用。符合计数根据康普顿散射运动学导致活动的本地化上的许多圆锥形表面在整个对象。本文提出了一种两阶段重建方法，即第一阶段重建第一探测器的每个位置敏感元件所见的圆锥线投影图像，第二阶段重建断层图像，并对这两个阶段进行了计算机模拟研究，同时还对第一阶段重建的初步实验数据进行了研究。实验数据是用一个原型锗探测器的探测元件获得的。研制了一种用于记录锗探测器和未准直的常规闪烁照相机之间的符合计数的微机电路。用Tc-99和Cs-137点源初步测量了电子准直的灵敏度和点扩展函数特性。
Iterative algorithmshave been investigated forreconstructing imagesfrom data acquired with a new type of gamma camera based upon an electronic method of collimating gamma radiation. The camera is composed of two detection systems which record a sequential interaction of the emitted gamma radiation. Coincident counting in accordance with Compton scattering kinematics leads to a localization of activity upon a multitude of conical surfaces throughout the object. A two‐stage reconstruction procedure in which conical line projection images as seen by each position sensing element of the first detector are reconstructed in the first stage, andtomographic imagesare reconstructed in the second stage, has been developed.Computer simulationstudies of both stages and first‐stage reconstruction studies with preliminary experimental data are reported. Experimental data were obtained with one detection element of a prototypegermanium detector. A microcomputer based circuit was developed to record coincident counts between the germanium detector and an uncollimated conventional scintillation camera. Point sources of Tc‐99mand Cs‐137 were used to perform preliminary measurements ofsensitivityandpoint spread functioncharacteristics ofelectronic collimation.