伽马通过率的摇摆特性是病人特定质量保证中校准场大小的函数

IF 0.3 Q4 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

Journal of Radiotherapy in Practice Pub Date : 2024-01-11 DOI:10.1017/S1460396923000444

Sathiya Raj, Venugopal Sundaram, H. Godson, Retna John

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引用次数: 0

摘要

摘要目的：本研究旨在探讨校准场大小对患者特定质量保证（PSQA）中伽马通过率（GPR）的影响。方法：使用两台独立的检测器，PTW OCT 960 和 PTW OCT 960：在对 26 名患者（14 名使用 Arc Check，12 名使用 4DOCT）的容积调制弧治疗计划中使用了两个独立的探测器：PTW OCTAVIUS 4D (4DOCT) 和 Arc Check。计划使用瓦里安 Unique 设备（4DOCT）和瓦里安 TrueBeam（Arc Check）实施，每种设备都采用了不同的校准因子（CF）：4 × 4、6 × 6、8 × 8、10 × 10、12 × 12 和 15 × 15 平方厘米的视野尺寸。伽马分析采用 2%2mm、2%3mm 和 3%3mm 伽马标准。结果：GPR 在不同的 CF 上表现出差异。10 × 10 平方厘米以下的 GPR 呈上升趋势，而 10 × 10 平方厘米以上的 GPR 呈下降趋势。两种检测器显示出相似的 GPR 模式。4DOCT 和 Arc Check 之间的相关性在严格标准（2%2mm）下很强，R² 值为 0-9957，在中等标准（2%3mm）下 R² 值为 0-9868，但在宽松标准（3%3mm）下有所降低，R² 值为 0-4226。结论本研究表明，校准区域的大小对 PSQA 中的 GPR 有显著影响。本研究建议，必须获得特定于规划的校准区域，以校准调制规划的质量保证设备。

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Wobbling nature of gamma passing rate as a function of calibration field sizes in patient-specific quality assurance

Abstract Purpose: This study aimed to investigate the influence of calibration field size on the gamma passing rate (GPR) in patient-specific quality assurance (PSQA). Methods: Two independent detectors, PTW OCTAVIUS 4D (4DOCT) and Arc Check, were utilised in volumetric modulated arc therapy plans for 26 patients (14 with Arc Check and 12 with 4DOCT). Plans were administered using Varian Unique machine (with 4DOCT) and Varian TrueBeam (with Arc Check), each employing different calibration factors (CFs): 4 × 4, 6 × 6, 8 × 8, 10 × 10, 12 × 12 and 15 × 15 cm2 field sizes. Gamma analysis was conducted with 2%2mm, 2%3mm and 3%3mm gamma criteria. Results: GPR exhibited variations across different CFs. GPR demonstrated an increasing trend below 10 × 10 cm² CFs, while it displayed a decreasing trend above 10 × 10 cm². Both detectors exhibited similar GPR patterns. The correlation between 4DOCT and Arc Check was strong in tighter criteria (2%2mm) with an R² value of 0·9957, moderate criteria (2%3mm) with an R² value of 0·9868, but reduced in liberal criteria (3%3mm) with an R² value of 0·4226. Conclusion: This study demonstrates that calibration field sizes significantly influence GPR in PSQA. This study recommends the plan specific calibration field must obtain to calibrate the QA devices for modulated plans.

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来源期刊

Journal of Radiotherapy in Practice RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-

CiteScore

0.80

自引率

0.00%

发文量

期刊介绍： Journal of Radiotherapy in Practice is a peer-reviewed journal covering all of the current modalities specific to clinical oncology and radiotherapy. The journal aims to publish research from a wide range of styles and encourage debate and the exchange of information and opinion from within the field of radiotherapy practice and clinical oncology. The journal also aims to encourage technical evaluations and case studies as well as equipment reviews that will be of interest to an international radiotherapy audience.