The out-of-plane contact shield and mA-modulation - the effect on fetal absorbed dose.

IF 0.8 4区环境科学与生态学 Q4 ENVIRONMENTAL SCIENCES

Radiation protection dosimetry Pub Date : 2024-11-18 DOI:10.1093/rpd/ncae204

Heli R S Larjava, Chibuzor T M Eneh, Aleksi Saikkonen, Riitta K Parkkola

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Abstract

The effect of patient shielding on fetal radiation dose was evaluated in computed tomography pulmonary angiography with the out-of-plane shield visible in the localizer but absent in the scan range in chest computed tomography (CT). An anthropomorphic phantom with additional prosthetic pregnancy belly was scanned with different CT scanners using clinical imaging protocols and radiophotoluminescence dosemeters (GD-352 M). The out-of-plane shield decreased the fetal absorbed radiation dose with Siemens Somatom go.Up, Canon Aquilion Prime SP and Canon Aquilion One scanners. The decrease was 3.9%-39.4% (0.01-0.09 mGy). With GE Optima the shield increased the fetal dose by 100% (0.23 mGy), with Canon Aquilion One and GE Optima scanners the abdomen dose increase was 17.5% and 36.4%, respectively (0.61 and 1.38 mGy). Applying an out-of-plane shield outside the scanned volume may increase the fetal radiation dose during CT when using tube current modulation, depending on the make and model of the CT scanner.

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平面外接触屏蔽和毫安调制--对胎儿吸收剂量的影响。

在胸部计算机断层扫描（CT）中，当平面外屏蔽物在定位器中可见但在扫描范围内不存在时，对患者屏蔽对胎儿辐射剂量的影响进行了评估。使用临床成像方案和放射光致发光剂量计（GD-352 M），用不同的 CT 扫描仪扫描了一个带有额外假体妊娠腹部的拟人化模型。在使用西门子 Somatom go.Up、佳能 Aquilion Prime SP 和佳能 Aquilion One 扫描仪时，平面外屏蔽降低了胎儿吸收的辐射剂量。降低幅度为 3.9%-39.4% (0.01-0.09 mGy)。使用 GE Optima 扫描仪时，屏蔽会使胎儿剂量增加 100%（0.23 mGy）；使用 Canon Aquilion One 和 GE Optima 扫描仪时，腹部剂量分别增加 17.5% 和 36.4%（0.61 和 1.38 mGy）。根据 CT 扫描仪的品牌和型号，在扫描范围外使用平面外屏蔽可能会增加 CT 扫描过程中的胎儿辐射剂量。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Radiation protection dosimetry 环境科学-公共卫生、环境卫生与职业卫生

CiteScore

1.40

自引率

10.00%

发文量

223

审稿时长

6-12 weeks

期刊介绍： Radiation Protection Dosimetry covers all aspects of personal and environmental dosimetry and monitoring, for both ionising and non-ionising radiations. This includes biological aspects, physical concepts, biophysical dosimetry, external and internal personal dosimetry and monitoring, environmental and workplace monitoring, accident dosimetry, and dosimetry related to the protection of patients. Particular emphasis is placed on papers covering the fundamentals of dosimetry; units, radiation quantities and conversion factors. Papers covering archaeological dating are included only if the fundamental measurement method or technique, such as thermoluminescence, has direct application to personal dosimetry measurements. Papers covering the dosimetric aspects of radon or other naturally occurring radioactive materials and low level radiation are included. Animal experiments and ecological sample measurements are not included unless there is a significant relevant content reason.