建议在图像引导放射治疗的锥束计算机断层扫描中通过减少成像视野宽度来降低晶状体照射剂量:一项拟人化模型研究。

IF 1.7 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
Radiological Physics and Technology Pub Date : 2024-09-01 Epub Date: 2024-04-30 DOI:10.1007/s12194-024-00810-0
Tatsuya Yoshida, Koji Sasaki, Tomoki Hayakawa, Toshiyuki Kawadai, Takako Shibasaki, Yoshiyuki Kawasaki
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引用次数: 0

摘要

在用于头部图像引导放射治疗(IGRT)的锥束计算机断层扫描(CBCT)中,我们通过缩小 X 射线孔径(叶片)在 X 方向的一侧(X2),评估了晶状体受照剂量的减少效果和位置匹配的准确性。我们将头部模型的眼表剂量定义为晶体的照射剂量,并使用放射光剂量计(RPLD,GD-352 M)测量了预设视野(13.6 厘米)和刀片 X2 光圈从 10.0 厘米到 5.0 厘米以 0.5 厘米为单位缩小时的每个视野。当刀片 X2 光圈设置为 13.6 厘米和 5.0 厘米时,对采集的 CBCT 图像进行了五次自动骨匹配,当头部模型以 1.0 毫米的增量从 - 5.0 毫米移动到 + 5.0 毫米时,在每个位置都进行了自动骨匹配。当叶片 X2 光圈为 5.0 厘米时,右晶状体曝光剂量的最大降低率为-38.7%,左晶状体为-13.2%。刀片 X2 光圈为 13.6 厘米和 5.0 厘米时,位置校正量的最大差异为 1 毫米,而自动骨骼匹配的准确性相似。在头部 CBCT 中,减小刀片 X2 孔径是一种有用的技术,既能减少晶状体曝光剂量,又能确保位置匹配的准确性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Recommendation for reducing the crystalline lens exposure dose by reducing imaging field width in cone-beam computed tomography for image-guided radiation therapy: an anthropomorphic phantom study.

In cone-beam computed tomography (CBCT) for image-guided radiation therapy (IGRT) of the head, we evaluated the exposure dose reduction effect to the crystalline lens and position-matching accuracy by narrowing one side (X2) of the X-ray aperture (blade) in the X-direction. We defined the ocular surface dose of the head phantom as the crystalline lens exposure dose and measured using a radiophotoluminescence dosimeter (RPLD, GD-352 M) in the preset field (13.6 cm) and in each of the fields when blade X2 aperture was reduced in 0.5 cm increments from 10.0 to 5.0 cm. Auto-bone matching was performed on CBCT images acquired five times with blade X2 aperture set to 13.6 cm and 5.0 cm at each position when the head phantom was moved from - 5.0 to + 5.0 mm in 1.0 mm increment. The maximum reduction rate in the crystalline lens exposure dose was - 38.7% for the right lens and - 13.2% for the left lens when blade X2 aperture was 5.0 cm. The maximum difference in the amount of position correction between blade X2 aperture of 13.6 cm and 5.0 cm was 1 mm, and the accuracy of auto-bone matching was similar. In CBCT of the head, reduced blade X2 aperture is a useful technique for reducing the crystalline lens exposure dose while ensuring the accuracy of position matching.

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来源期刊
Radiological Physics and Technology
Radiological Physics and Technology RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-
CiteScore
3.00
自引率
12.50%
发文量
40
期刊介绍: The purpose of the journal Radiological Physics and Technology is to provide a forum for sharing new knowledge related to research and development in radiological science and technology, including medical physics and radiological technology in diagnostic radiology, nuclear medicine, and radiation therapy among many other radiological disciplines, as well as to contribute to progress and improvement in medical practice and patient health care.
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