Parallax error is a major issue in small animal positron emission tomography (PET) scanners which are used in preclinical studies or detailed scanning of human organs. Several methods have been proposed and investigated to reduce this radial artifact in PET images by estimating the depth of interaction (DOI) of 511-keV photons in the crystal. Among all, the dual-ended readout method seems to be very simple and effective as it does not have any fabrication and readout complications. In the past, some studies suggested that increasing the roughness of crystal lateral surfaces improves DOI resolution. In this paper, this was experimentally examined for four Ce:GAGG crystals with different surface structures.

中文翻译：

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不同表面处理的基于双端读出 GAGG 的 DOI-PET 探测器的评估

视差误差是用于临床前研究或人体器官详细扫描的小动物正电子发射断层扫描 (PET) 扫描仪的主要问题。已经提出并研究了几种方法，通过估计晶体中 511-keV 光子的相互作用深度 (DOI) 来减少 PET 图像中的这种径向伪影。其中，双端读出方法似乎非常简单有效，因为它没有任何制造和读出复杂性。过去，一些研究表明，增加晶体侧面的粗糙度可以提高 DOI 分辨率。在本文中，对具有不同表面结构的四种 Ce:GAGG 晶体进行了实验检查。