Characterization or Monolithic Scintillation Detectors Etched with Laser Induced Optical Barriers.
Characterization or Monolithic Scintillation Detectors Etched with Laser Induced Optical Barriers.
复制标题
用激光诱导光学屏障蚀刻的表征或单片闪烁探测器。
DOI：
10.1109/trpms.2018.2875156
复制
发表时间：
2019
影响因子：
4.4
通讯作者：
Karp,JS
中科院分区：
文献类型：
--
作者：
Panetta,JV;Surti,S;Singh,B;Karp,JS
几个小组正在积极研究使用各种晶体厚度、光传感器配置和表面处理的单片(连续)闪烁探测器的性能。本文探讨了适用于全身PET系统的厚里索晶体的性能。为了提高探测器的性能，在晶体中刻蚀了激光诱导光障(LIOB)，以改变晶体内光传播的行为。我们使用具有不同激光刻蚀参数的小立方体LYSO来研究LIOB对光学光的响应行为，以表征光学势垒的影响。我们证明了通过改变激光刻蚀的参数可以改变刻蚀的不透明度，从而影响厚晶体中随深度变化的光响应和空间分辨率。我们成功地刻蚀了厚度为50×50×25-mm~3的几种晶体，采用精细的LIOB网格，并在511keV伽马能量下获得了接近3 mm的平均空间分辨率。
Several groups are actively investigating the performance of monolithic (continuous) scintillation detectors using a variety of crystal thicknesses, photo-sensor configurations, and surface treatments. This paper explores the performance of thick LYSO crystals that would be applicable to a whole-body PET system. The crystals were etched with laser induced optical barriers (LIOBs) to alter the behavior of the light spread within the crystal in order to improve the performance of the detector. We studied the behavior of the LIOBs in response to optical light using small cubes of LYSO with a variety of laser etching parameters to characterize the impact of the optical barriers. We demonstrated that the opacity of the etchings can be altered by varying the parameters of the laser etching, which influences the depth-dependent light response and spatial resolution in the thick crystal. We successfully etched several crystals, as large as 50 × 50 × 25-mm3thick, with a fine grid of LIOBs, and achieved an average spatial resolution close to 3 mm (FWHM) with 511-keV gammas.