使用诊断正电子发射断层扫描-计算机断层扫描系统进行放射治疗定位规划：治疗床面的变形。
Use of a diagnostic positron emission tomography-computed tomography system for planning radiotherapy positioning: distortion of the tabletop.
机构信息
Department of Radiology, Graduate School of Medicine, University of Tokushima, Tokushima, Japan.
出版信息
Jpn J Radiol. 2010 Feb;28(2):143-8. doi: 10.1007/s11604-009-0398-0. Epub 2010 Feb 26.
PURPOSE
The aim of this study was to evaluate distortion of the tabletop in a diagnostic positron emission tomography-computed tomography (PET-CT) system to determine its suitability for planning radiotherapy positioning.
MATERIALS AND METHODS
Distortion of the tabletop was compared among PET-CT, lineac CT, and CT simulator systems. A phantom or angiography catheter was fixed to the tabletop and imaged after iron plate weight loading. The acquired images were analyzed using radiotherapy planning software. Distortion of the tabletop was measured based on the displayed coordinates.
RESULTS
Sinking represented the greatest distortion of the tabletop in all systems. Using the same baseline, the maximum sinking were -0.4, -0.2, and +0.4 cm, respectively. The distortion of the tabletop in the PET-CT system was more similar to that in the lineac CT than in the CT simulator system.
CONCLUSION
Distortion of the tabletop in a diagnostic PET-CT system may be within the acceptable range to allow its use for planning radiotherapy positioning.
目的
本研究旨在评估诊断正电子发射断层扫描-计算机断层扫描（PET-CT）系统中治疗床的变形情况，以确定其在放射治疗定位计划中的适用性。
材料与方法
比较了 PET-CT、直线加速器 CT 和 CT 模拟系统中治疗床的变形情况。将一个体模或血管造影导管固定在治疗床上，在铁盘加荷后进行成像。使用放射治疗计划软件对采集到的图像进行分析。根据显示的坐标测量治疗床的变形。
结果
在所有系统中，下沉是治疗床最大的变形。使用相同的基线，最大下沉分别为-0.4、-0.2 和+0.4cm。PET-CT 系统的治疗床变形与直线加速器 CT 系统更为相似，而与 CT 模拟系统不同。
结论
诊断用 PET-CT 系统的治疗床变形可能在可接受范围内，允许其用于放射治疗定位计划。
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