Initial three- and half-year machine performance assessment of a superficial radiation therapy unit

IF 2.2 4区医学 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

Journal of Applied Clinical Medical Physics Pub Date : 2025-09-21 DOI:10.1002/acm2.70258

Yongsook C. Lee, William Romaguera, Stephen D. Davis, D Jay Wieczorek, Vibha Chaswal, Ranjini Tolakanahalli, Minesh P. Mehta, Noah S. Kalman, Alonso N. Gutierrez

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引用次数: 0

Abstract

Purpose

This work reports on results of periodic machine quality assurance (QA) tests for our superficial radiation therapy (SRT) unit (SRT-100 Vision) performed for the first three- and half- year.

Methods

Results of machine warm-up, dosimetry, mechanical, safety and imaging QA tests for our SRT-100 Vision unit were reviewed and analyzed. Dosimetry tests included output constancy, backup timer, timer accuracy, beam quality (half value layer [HVL]), applicator factors (AFs), absolute output calibration, output constancy with varying x-ray tube head rotation, output reproducibility, output linearity, timer and end-effect error, percent depth dose (PDD) verification and congruence between radiation field and applicator size. Mechanical tests encompassed unit stability as well as applicator integrity and indicators. Safety tests consisted of visual and audio monitors, beam-on indicator, interlocks, and energy/filter indicators. Imaging tests for ultrasound covered functional check, spatial integrity, and image quality check. The QA tests were performed for three kilovoltage (kV) x-ray energies (50, 70, and 100 kV_p) and six applicators (1.5, 2.0, 2.5, 3.0, 4.0, and 5.0 cm in diameter).

Results

Daily mandatory machine warm-up was successfully completed on each day of treatment. The results of all dosimetry tests for three energies were within the recommended tolerance. Daily, and monthly outputs and annual absolute outputs were < ± 3.0%, < ± 2.0%, and < ± 1.3%, respectively. Backup timer displayed timer set ± 0.0%. Timer accuracy was < ± 1.0 sec. HVLs and AFs were < ± 1.1% and < ± 0.3%, respectively. Outputs for different head angles were < ± 1.0% and output reproducibility was within 0.1%. Output linearity was < ± 0.6% and end-effect errors were < ± 0.0006 min. PDDs were < ± 2.2%. Congruence was < ± 0.5 mm. Monthly mechanical tests confirmed mechanical robustness of our unit. Daily safety features were verified to be functional each day. Monthly imaging tests for ultrasound showed good functionality, image quality, and spatial integrity meeting the set tolerance.

Conclusions

The QA results demonstrated high performance and stability of our SRT-100 Vision unit over the first three and a half years of operation.

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初步三年半的机器性能评估浅表放射治疗单位

本工作报告了我们的浅表放射治疗（SRT）单元（SRT-100 Vision）前三年半进行的定期机器质量保证（QA）测试的结果。方法对SRT-100视觉装置的机器预热、剂量学、力学、安全性和成像质量保证试验结果进行回顾和分析。剂量学试验包括输出常数、备用计时器、计时器精度、光束质量（半值层[HVL]）、施药器因子（AFs）、绝对输出校准、随x射线管头部旋转变化的输出常数、输出可重复性、输出线性度、计时器和末端效应误差、深度剂量百分比（PDD）验证以及辐射场与施药器尺寸之间的一致性。机械测试包括单元稳定性以及涂抹器完整性和指标。安全测试包括视觉和音频监视器，光束指示器，联锁和能量/过滤器指示器。超声成像测试包括功能检查、空间完整性检查和图像质量检查。QA测试针对3个千伏x射线能量（50、70和100 kVp）和6个涂药器（直径1.5、2.0、2.5、3.0、4.0和5.0 cm）进行。结果每日强制机器热身均成功完成。三种能量的所有剂量学试验结果均在推荐耐受范围内。日产量、月产量和年绝对产量分别为±3.0%、±2.0%和±1.3%。备份定时器显示定时器设置±0.0%。定时器精度为±1.0秒，hvl和AFs分别为±1.1%和±0.3%。不同头角的输出为±1.0%，输出重现性在0.1%以内。输出线性度为<；±0.6%，末端效应误差为<；±0.0006 min。pdd为±2.2%。一致性为<；±0.5 mm。每月的机械测试证实了我们机组的机械坚固性。日常安全功能每天都被验证是有效的。每月超声成像检查显示良好的功能、图像质量和空间完整性符合设定的公差。质量保证结果表明，我们的SRT-100视觉单元在前三年半的运行中表现出高性能和稳定性。

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来源期刊

Journal of Applied Clinical Medical Physics 医学-核医学

CiteScore

3.60

自引率

19.00%

发文量

331

审稿时长

3 months

期刊介绍： Journal of Applied Clinical Medical Physics is an international Open Access publication dedicated to clinical medical physics. JACMP welcomes original contributions dealing with all aspects of medical physics from scientists working in the clinical medical physics around the world. JACMP accepts only online submission. JACMP will publish: -Original Contributions: Peer-reviewed, investigations that represent new and significant contributions to the field. Recommended word count: up to 7500. -Review Articles: Reviews of major areas or sub-areas in the field of clinical medical physics. These articles may be of any length and are peer reviewed. -Technical Notes: These should be no longer than 3000 words, including key references. -Letters to the Editor: Comments on papers published in JACMP or on any other matters of interest to clinical medical physics. These should not be more than 1250 (including the literature) and their publication is only based on the decision of the editor, who occasionally asks experts on the merit of the contents. -Book Reviews: The editorial office solicits Book Reviews. -Announcements of Forthcoming Meetings: The Editor may provide notice of forthcoming meetings, course offerings, and other events relevant to clinical medical physics. -Parallel Opposed Editorial: We welcome topics relevant to clinical practice and medical physics profession. The contents can be controversial debate or opposed aspects of an issue. One author argues for the position and the other against. Each side of the debate contains an opening statement up to 800 words, followed by a rebuttal up to 500 words. Readers interested in participating in this series should contact the moderator with a proposed title and a short description of the topic