malalignment

Methods: By using a perfect parallel-hole collimator model and a collimator model considering the splayed angle effect,this paper proposed a novel method which considers the space response function(SRF) calculating the system matrix and uses an improved Ray Tracing algorithm to perform attenuation correction.

目的:改进平行孔准直器SPECT系统的成像方法,快速、精确地实现有序子集期望值最大化(OSEM)重建算法。

The new angular distortion real-time measuring system is developed, which utilizes photoelectric self-collimation parallel optic equipment, replicate optic equipment and other equipment fixed on desk ,using computer control system to realizes real-time measuring vessel distortion.

研制一种新型的角变形实时测量系统, 其利用布设在甲板上的光电自准直平行光管和折转光管等相关设备, 通过计算机控制系统实现实时测量艇体两维动态变形量。