碳离子放射治疗过程中前列腺的点间误差和点内运动,以及有无靶标的患者位置登记的剂量测定比较。

IF 1.7 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
Radiological Physics and Technology Pub Date : 2024-06-01 Epub Date: 2024-05-01 DOI:10.1007/s12194-024-00808-8
Yuma Iwai, Shinichiro Mori, Hitoshi Ishikawa, Nobuyuki Kanematsu, Shinnosuke Matsumoto, Taku Nakaji, Noriyuki Okonogi, Kana Kobayashi, Masaru Wakatsuki, Takashi Uno, Shigeru Yamada
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引用次数: 0

摘要

一些报告讨论了分段间位置误差和分段内运动对剂量分布的影响,尤其是对分散的布拉格峰的影响。我们通过监测靶标位置,研究了点间和点内前列腺位置误差。2020 年,我们调查了 15 名接受碳离子束放射治疗(CIRT)并使用金标记的前列腺癌患者的数据。我们在照射前和照射过程中检查了标记物的位置,计算出了点间定位和点内移动,并通过调整计划射束等中心和临床靶体积(CTV)位置评估了CIRT的剂量分布。我们在治疗计划系统上比较了骨骼匹配照射和靶标匹配照射的 CTV 剂量覆盖率(CTV 接受规定剂量的 95% [V95%] 或 98% [V98%])。就分段间误差而言,规划图像中的标记位置与开始使用骨骼匹配照射的患者标记位置之间的平均距离为 1.49 ± 1.11 毫米(第 95 百分位数 = 1.85 毫米)。沿着侧轴、下轴、上轴、背轴和腹轴,分内移动的第 95 百分位数(最大值)分别为 0.79 毫米(2.31 毫米)、1.17 毫米(2.48 毫米)、1.88 毫米(4.01 毫米)、1.23 毫米(3.00 毫米)和 2.09 毫米(8.46 毫米)。骨骼匹配计划的平均 V95% 和 V98% 分别为 98.2% 和 96.2%,靶标匹配计划的平均 V95% 和 V98% 分别为 99.5% 和 96.8%。与骨骼匹配照射相比,靶点匹配照射提高了前列腺癌CIRT的CTV剂量覆盖率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Inter-fractional error and intra-fractional motion of prostate and dosimetry comparisons of patient position registrations with versus without fiducial markers during treatment with carbon-ion radiotherapy.

A few reports have discussed the influence of inter-fractional position error and intra-fractional motion on dose distribution, particularly regarding a spread-out Bragg peak. We investigated inter-fractional and intra-fractional prostate position error by monitoring fiducial marker positions. In 2020, data from 15 patients with prostate cancer who received carbon-ion beam radiotherapy (CIRT) with gold markers were investigated. We checked marker positions before and during irradiation to calculate the inter-fractional positioning and intra-fractional movement and evaluated the CIRT dose distribution by adjusting the planning beam isocenter and clinical target volume (CTV) position. We compared the CTV dose coverages (CTV receiving 95% [V95%] or 98% [V98%] of the prescribed dose) between skeletal and fiducial matching irradiation on the treatment planning system. For inter-fractional error, the mean distance between the marker position in the planning images and that in a patient starting irradiation with skeletal matching was 1.49 ± 1.11 mm (95th percentile = 1.85 mm). The 95th percentile (maximum) values of the intra-fractional movement were 0.79 mm (2.31 mm), 1.17 mm (2.48 mm), 1.88 mm (4.01 mm), 1.23 mm (3.00 mm), and 2.09 mm (8.46 mm) along the lateral, inferior, superior, dorsal, and ventral axes, respectively. The mean V95% and V98% were 98.2% and 96.2% for the skeletal matching plan and 99.5% and 96.8% for the fiducial matching plan, respectively. Fiducial matching irradiation improved the CTV dose coverage compared with skeletal matching irradiation for CIRT for prostate cancer.

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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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