小场尺寸、剂量网格尺寸和可变分弧法对放射治疗中伽马通过率的剂量学影响。

IF 1.7 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
Radiological Physics and Technology Pub Date : 2024-09-01 Epub Date: 2024-05-20 DOI:10.1007/s12194-024-00809-7
Tsunekazu Kuwae, Takuro Ariga, Takeaki Kusada, Akihiro Nishie
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引用次数: 0

摘要

这项研究利用 Acuros XB(AXB)算法和 ArcCHECK™ 测量方法,研究了外围低剂量区域的计算精度对伽马通过率(GPR)的影响。分析了不同小场尺寸、剂量网格尺寸和分弧技术对 GPR 的影响。采用了不同的小场尺寸。使用 AXB 算法计算了 32 个单弧计划,其剂量网格尺寸分别为 2 毫米和 1 毫米,规定剂量分别为 2、5、10 和 20 Gy。总共检查了 128 个 GPR 图。这些计划被分为三个子场(3SF)、四个子场(4SF)和六个子场(6SF)。目标尺寸越小、单弧剂量网格尺寸为 2 毫米时,GPR 结果越差。目标尺寸越小、剂量网格尺寸为 1 毫米时,GPR 也会出现类似的衰减。不过,在相同的目标尺寸下,1 毫米剂量网格尺寸的 GPR 值通常要好于 2 毫米剂量网格尺寸的 GPR 值。在分割弧法中,分割角越细,剂量网格尺寸越大,GPR 越好。然而,更精细的分割角和 1 毫米的剂量网格尺寸在统计学上没有明显改善。这项研究表明,较粗的剂量网格尺寸会导致外围低剂量区域的 GPR 值降低,这是由 AXB 和 ArcCHECK™ 测量计算得出的结果。为了提高 GPR,采用分弧方法和更细的剂量网格尺寸可能会有所帮助。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Dosimetric effects of small field size, dose grid size, and variable split-arc methods on gamma pass rates in radiation therapy.

This study investigates the influence of calculation accuracy in peripheral low-dose regions on the gamma pass rate (GPR), utilizing the Acuros XB (AXB) algorithm and ArcCHECK™ measurement. The effects of varying small field sizes, dose grid sizes, and split-arc techniques on GPR were analyzed. Various small field sizes were employed. Thirty-two single-arc plans with dose grid sizes of 2 mm and 1 mm and prescribed doses of 2, 5, 10, and 20 Gy were calculated using the AXB algorithm. In total, 128 GPR plans were examined. These plans were categorized into three sub-fields (3SF), four sub-fields (4SF), and six sub-fields (6SF). The GPR results deteriorated with smaller target sizes and a 2 mm dose grid size in a single arc. A similar degradation in GPR was observed with smaller target sizes and a 1 mm dose grid size. However, the 1 mm dose grid size generally resulted in better GPR compared with the 2 mm dose grid size for the same target sizes. The GPR improved with finer split angles and a 2 mm dose grid size in the split-arc method. However, no statistically significant improvement was observed with finer split angles and a 1 mm dose grid size. This study demonstrates that coarser dose grid sizes result in lower GPRs in peripheral low-dose regions as calculated by AXB with ArcCHECK™ measurement. To enhance GPR, employing split-arc methods and finer dose grid sizes could be beneficial.

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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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