Novel laser-processed CsI:Tl detector for SPECT.
Novel laser-processed CsI:Tl detector for SPECT.
复制标题
用于 SPECT 的新型激光加工 CsI:Tl 探测器。
DOI：
10.1118/1.4947294
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发表时间：
2016
期刊：
影响因子：
3.8
通讯作者：
El-Fakhri,G
中科院分区：
文献类型：
--
作者：
Sabet,H;Bläckberg,L;Uzun-Ozsahin,D;El-Fakhri,G
PurposeThe的目的，这项工作是证明一种新的技术的可行性，用于制造高空间分辨率的CsI：Tl闪烁探测器的单光子发射计算机断层扫描systems.MethodsThe闪烁器制造使用激光诱导的光学屏障技术，以创建光学微结构（或光学屏障）内的CsI：Tl晶体散装。激光处理的CsI：Tl晶体的厚度为3、5和10 mm。在这项工作中，作者专注于最简单的光学屏障图案，因为屏障是在晶体体中形成的，以形成类似于机械像素化光栅的像素状图案。用1.0 × 1.0 mm{sup 2}和0.625 × 0.625 mm{sup 2}像素的光栅图形制作了单片CsI：Tl闪烁体样品。进行了实验，以表征所制造的阵列的像素分离和能量分辨率。一个4 × 4阵列的多像素光子计数器被用来收集闪烁光在所有的experiments.ResultsThe工艺成品率为制作CsI：Tl阵列是100%，加工时间在50 min以下。从制造的探测器暴露于122 keV的γ射线的泛图，峰谷（P/V）比大于2.3计算。的P/V值表明，无论晶体厚度，像素可以resolved.ConclusionsThe结果表明，光学屏障可以被认为是一个强大的替代机械像素阵列，可以提供高的空间分辨率，同时保持在一个高吞吐量和成本效益的方式的灵敏度。
PurposeThe aim of this work is to demonstrate the feasibility of a novel technique for fabrication of high spatial resolution CsI:Tl scintillation detectors for single photon emission computed tomography systems.MethodsThe scintillators are fabricated using laser-induced optical barriers technique to create optical microstructures (or optical barriers) inside the CsI:Tl crystal bulk. The laser-processed CsI:Tl crystals are 3, 5, and 10 mm in thickness. In this work, the authors focus on the simplest pattern of optical barriers in that the barriers are created in the crystal bulk to form pixel-like patterns resembling mechanically pixelated scintillators. The monolithic CsI:Tl scintillator samples are fabricated with optical barrier patterns with 1.0 × 1.0 mm{sup 2} and 0.625 × 0.625 mm{sup 2} pixels. Experiments were conducted to characterize the fabricated arrays in terms of pixel separation and energy resolution. A 4 × 4 array of multipixel photon counter was used to collect the scintillation light in all the experiments.ResultsThe process yield for fabricating the CsI:Tl arrays is 100% with processing time under 50 min. From the flood maps of the fabricated detectors exposed to 122 keV gammas, peak-to-valley (P/V) ratios of greater than 2.3 are calculated. The P/V values suggest that regardless of the crystal thickness, the pixels can be resolved.ConclusionsThe results suggest that optical barriers can be considered as a robust alternative to mechanically pixelated arrays and can provide high spatial resolution while maintaining the sensitivity in a high-throughput and cost-effective manner.