Eye lens dose distribution in neonatal head CT: an analysis of the scanning conditions and CTDIvol limitations.

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

Radiation protection dosimetry Pub Date : 2026-08-31 DOI:10.1093/rpd/ncag046

Tatsuhiro Gotanda, Takuya Akagawa, Tomoyuki Hasuo, Shinnosuke Nishihara, Kohsei Matsuura, Yasuyuki Kawaji, Hidetoshi Yatake, Shinya Imai, Rumi Gotanda, Toshizo Katsuda

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引用次数: 0

Abstract

Despite neonatal radiosensitivity, accurate lens dose assessments in computed tomography (CT) are lacking. We assessed the neonatal head CT eye lens dose under various scanning conditions, including vertical table displacement and organ-based exposure modulation (OEM), using the GAFCHROMIC LD-V1 (LD-V1), which can measure two-dimensional dose distributions, and we evaluated the limitations of conventional dose indices. The lens dose decreased with increasing distance from the isocentre for the Canon 320. Whereas, for the Canon 80 and Siemens, the dose peaked at +25 mm and then decreased. For the OEM, the dose reduction effect decreased at 30°. The CT dose index volume remained consistent. Spatially resolved dosimetry using the LD-V1 reveals beam overlap and positioning-related dose anomalies that cannot be captured by point dosimeters or conventional indices. The LD-V1 can effectively evaluate superficial dose distributions and guide dose optimization in neonatal imaging.

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新生儿头部CT的眼晶状体剂量分布：扫描条件和CTDIvol局限性分析。

尽管新生儿对放射敏感，但在计算机断层扫描（CT）中缺乏准确的晶状体剂量评估。采用可测量二维剂量分布的GAFCHROMIC LD-V1 （LD-V1）测量新生儿头部CT眼透镜在不同扫描条件下的剂量，包括垂直台位移和基于器官的暴露调制（OEM），并评估常规剂量指标的局限性。佳能320的镜头剂量随着距离等心的增加而减少。然而，对于佳能80和西门子，剂量在+25毫米时达到峰值，然后下降。对于OEM，剂量减少效应在30°处减弱。CT剂量指数体积保持一致。使用LD-V1的空间分辨剂量测定揭示了点剂量计或常规指数无法捕捉到的光束重叠和与位置相关的剂量异常。LD-V1可有效评估新生儿影像学中浅表剂量分布，指导剂量优化。

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.