Evaluation of intrafraction motion with an open immobilization mask for HyperArc treatment of multiple brain metastases.

IF 0.7 Q4 SURGERY Journal of radiosurgery and SBRT Pub Date : 2022-01-01

Natalia Tejedor-Aguilar, Françoise Lliso, Juan C Ruiz-Rodríguez, Jose Gimeno-Olmos, Vicente Carmona, Jorge Bonaque, Juan A Bautista, Jose Perez-Calatayud

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Abstract

Purpose: In the implementation of the use of Encompass^TM partially open immobilization mask to perform SRS of multiple brain metastasis, the evaluation of patient's intrafraction motion (IM) is deemed convenient to verify that the margins applied to the GTV are able to ensure adequate dose coverage to each lesion.

Methods: IM was determined by comparing the pre- and post-treatment CBCT images with respect to the simulation CT for a total of 23 fractions. The dosimetric impact on GTV coverage due to translational errors in patient positioning and rotational uncertainties of LINAC's performance was also evaluated.

Results: The absolute magnitude of IM was less than 1 mm in all cases. The dosimetric difference on GTV coverage due to patient's IM was inferior to 5%. There was not found any significant correlation between the dosimetric impact of rotational uncertainties with the distance to the isocenter.

Conclusion: The margins applied to the GTV are adequate when using Encompass^TM immobilization device.

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应用开放式固定面罩对HyperArc治疗多发性脑转移瘤的评价。

目的:在实施使用EncompassTM部分开放式固定化面罩进行多发性脑转移的SRS时，评估患者的吸积内运动(IM)便于验证应用于GTV的边缘是否能够确保对每个病灶的足够剂量覆盖。方法:通过比较处理前后的CBCT图像与模拟CT的23个分数来确定IM。由于患者定位的平移误差和LINAC性能的旋转不确定性，剂量学对GTV覆盖率的影响也进行了评估。结果:所有病例的IM绝对值均小于1 mm。由于患者IM引起的GTV覆盖率剂量学差异小于5%。没有发现旋转不确定度对剂量学的影响与到等中心的距离有显著的相关性。结论:采用EncompassTM固定装置时，GTV侧缘足够。

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

Journal of radiosurgery and SBRT SURGERY-

CiteScore

1.40

自引率

8.30%

发文量