Multi-institutional study of multileaf collimator parameters and dose calculation accuracy using the enhanced leaf model.

IF 1.6 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

Radiological Physics and Technology Pub Date : 2026-06-01 Epub Date: 2026-04-11 DOI:10.1007/s12194-026-01050-0

Jun Takatsu, Tatsuya Inoue, Yohei Utena, Tadashi Sugita, Fumiyoshi Katai, Naoya Hara, Ruiheng Fan, Kenichi Jumonji, Naoya Kamiyama, Yuki Wada, Takeaki Oi, Ryuta Hirai, Naoto Shikama

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引用次数: 0

Abstract

The aim of this study was to determine appropriate multileaf collimator (MLC) parameters for the Enhanced Leaf Model (ELM) for the Varian TrueBeam (120 MLC) and to verify the dose calculation accuracy of the ELM in brain stereotactic radiotherapy (SRT). A survey on transmission and dosimetric leaf gap (DLG) values was conducted at five institutions. Dosimetric verification was performed for brain SRT using SRS MapCHECK or Gafchromic film for four targets (0.4-2.8 cm³) positioned up to 7.6 cm from the isocenter. Median values and 95% confidence intervals for transmission and DLG were established for 6 MV, 10 MV, 6 MV-flattening filter-free (FFF), and 10 MV-FFF beams. Dosimetric verification achieved median gamma passing rates exceeding 95% at 3%/1 mm criterion for all targets. The verification results confirmed that the transmission and DLG values obtained from the survey were clinically acceptable. This study provides useful baseline data for institutions implementing the ELM.

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基于增强叶片模型的多叶片准直器参数和剂量计算精度的多机构研究。

本研究的目的是为Varian TrueBeam （120 MLC）的增强型叶模型（Enhanced Leaf Model， ELM）确定合适的多叶准直器（MLC）参数，并验证ELM在脑立体定向放疗（SRT）中的剂量计算精度。对5个单位的叶片间隙（DLG）进行了传播和剂量学调查。使用SRS MapCHECK或Gafchromic薄膜对距离等中心7.6 cm的4个目标（0.4-2.8 cm3）进行脑SRT剂量学验证。建立了6 MV、10 MV、6 MV无压扁滤波器（FFF）和10 MV-FFF波束的传输和DLG的中位数和95%置信区间。剂量学验证在3%/1 mm标准下，所有目标的中位伽玛通过率超过95%。验证结果证实，从调查中获得的透射和DLG值在临床上是可接受的。这项研究为推行低成本管理的机构提供了有用的基线数据。

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

Radiological Physics and Technology RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-

CiteScore

3.00

自引率

12.50%

发文量

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.