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首页> 外文期刊>Radiology >Arm Raising at exposure-controlled multidetector trauma CT of thoracoabdominal region: higher image quality, lower radiation dose.
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Arm Raising at exposure-controlled multidetector trauma CT of thoracoabdominal region: higher image quality, lower radiation dose.

机译：胸腹区受辐射控制的多探测器创伤CT上的举臂：更高的图像质量，更低的辐射剂量。

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PURPOSE: To evaluate the effect of arm position on image quality and effective radiation dose in an automatic exposure-controlled (AEC) multidetector thoracoabdominal computed tomography (CT) protocol in trauma patients. MATERIALS AND METHODS: This retrospective study of the data of 177 trauma patients (117 male; median age, 39 years) was approved by the institutional ethics board, with informed patient consent waived. Patients underwent scanning by using an AEC 16-detector thoracoabdominal CT protocol in which both arms were raised above the shoulder region (standard-position group, 132 patients), one arm was raised and the other was down (one-arm group, 27 patients), or both arms were down (two-arm group, 18 patients). Objective and subjective image quality was assessed. Individual effective radiation dose was calculated from the effective tube current-time product per exposed section. For this purpose, section location-dependent conversion factors were derived by using a CT dosimetry calculator. Theeffect of arm position on effective dose was quantified by using linear regression analysis with correction for patient volume and attenuation. RESULTS: Compared with the image quality in the standard-position group, the image quality in the one- and two-arm groups was decreased but within acceptable diagnostic limits. The median corrected effective dose in the standard-position group was 18.6 mSv; the dose in the one-arm group was 18% (95% confidence interval: 11%, 25%) higher than this, and that in the two-arm group was 45% (95% confidence interval: 34%, 57%) higher. CONCLUSION: Omitting arm raising results in lower but acceptable image quality and a substantially higher effective radiation dose. Hence, effort should be made to position the arms above the shoulder when scanning trauma patients. Clinical trial registration no. NCT00228111.
机译：目的：在创伤患者中，以自动曝光控制（AEC）多探测器胸腹计算机断层扫描（CT）方案评估手臂位置对图像质量和有效辐射剂量的影响。材料与方法：这项对177名创伤患者（117名男性;中位年龄，39岁）的数据进行的回顾性研究获得了机构伦理委员会的批准，患者的知情同意被放弃。患者使用AEC 16探测器胸腹CT扫描，其中两臂抬高至肩部区域上方（标准位置组，132例患者），一只臂抬高而另一只臂下垂（单臂组，27例） ），或者两臂都放倒了（两臂组18例）。评估客观和主观图像质量。从每个暴露部分的有效管电流-时间乘积计算出各个有效辐射剂量。为此，使用CT剂量计算器计算出断面位置相关的转换因子。手臂位置对有效剂量的影响通过使用线性回归分析对患者的体积和衰减进行校正来量化。结果：与标准位置组的图像质量相比，一臂组和两臂组的图像质量有所下降，但在可接受的诊断范围内。标准位置组的中位校正有效剂量为18.6 mSv。单臂组的剂量比此剂量高18％（95％置信区间：11％，25％），而两臂组的剂量高45％（95％置信区间：34％，57％）更高。结论：省略手臂抬高会导致较低但可接受的图像质量和实质上较高的有效辐射剂量。因此，在扫描创伤患者时应努力将手臂放在肩膀上方。临床试验注册号NCT00228111。

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