A low-energy multihole converging collimator compared with a pinhole collimator.
A low-energy multihole converging collimator compared with a pinhole collimator.
复制标题
低能量多孔会聚准直器与针孔准直器的比较。
作者：
R. Moyer
从描述闪烁相机上的针孔和会聚准直器性能的方程可以明显看出，这两个准直器的灵敏度、分辨率和视场随着距准直器表面的距离而有很大不同。构建了专为 /sup 99m/Tc 设计的 6000 孔会聚准直器，在距准直器表面 10 cm 处具有 15 cm 视场直径，并与 Searle Radigraphicas 针孔准直器进行了比较。会聚准直器的灵敏度随着深度的增加而增加，而针孔准直器的灵敏度则降低。准直器-相机系统的分辨率随着针孔准直器的深度降低得更快。会聚准直器的视场随着物体到准直器距离的增加而减小，而针孔准直器的视场随着深度的增加而增加。实验结果与推导的方程一致，表明会聚准直器具有与针孔准直器截然不同的性能特征，并且它应该可用于小器官的成像。 （授权）
It is apparent from the equations describing the performance of the pinhole and converging collimators on the scintillation camera that the sensitivity, resolution, and field of view of these two collimators are very different as a function of distance from the collimator face. A 6000-hole converging collimator designed for /sup 99m/Tc havin a 15-cm field of view diameter at 10 cm from the collimator face was constructed and compared with the Searle Radiographicas pinhole collimator. The sensitivity of the converging collimator increases with depth while that of the pinhole collimator decreases. The resolution of the collimator-camera system degrades more rapidly with depth fur the pinhole collamator. The field of view of the converging collimator decreases with increasing object-tocollimator distances while that of the pinhole collimator increase with depth. The experimental results agree with the derived equations and imply that the converging collimator has very different performance characteristics from the pinhole collimator and that it should be useful in the imaging of small organs. (auth)