Abstract

Radiation exposure in computed tomography (CT) is automatically modulated by automatic exposure control (AEC) mainly based on scout images. To simulate the whole-body positron emission tomography/CT, CT images of a phantom were obtained using the posteroanterior scout image alone (PA scout) or the posteroanterior and lateral images (PA + Lat scout). Old and new versions of the AEC software were compared. Using the old version of the software and the PA scout, a markedly high dose at the top of the head was observed, which varied depending on the position of the phantom. This issue was resolved in the new version of the software. Radiation dose in the shoulder region was much higher using the PA scout than using the PA + Lat scout, even with the new version of the software. AEC may cause unreasonably high radiation exposure locally, and the appropriateness of the dose modulation pattern should be examined at each facility.

中文翻译：

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全身体位正电子发射断层扫描/计算机断层扫描的计算机断层扫描组件中辐射剂量的次优调制

摘要

主要根据侦查图像，通过自动曝光控制（AEC）自动调制计算机断层扫描（CT）中的辐射曝光。为了模拟全身正电子发射断层扫描/ CT，使用单独的后后方侦察图像（PA scout）或后后方和侧面图像（PA + Lat scout）获得体模的CT图像。比较了旧版本和新版本的AEC软件。使用旧版本的软件和PA侦察器，观察到头部顶部的剂量明显较高，该剂量随体模的位置而变化。在新版本的软件中已解决此问题。即使使用新版软件，使用PA侦察器的肩部辐射剂量也要比使用PA + Lat侦察器高得多。AEC可能会导致局部不合理的高辐射暴露，