Design and validation of a novel dosimetry phantom for motion management audits.

IF 2 4区 医学 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
Alex Burton, Sabeena Beveridge, Nicholas Hardcastle, Silvio Malfitana, Janaka Madamperuma, Rick Franich
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引用次数: 0

Abstract

Background: We present a novel phantom design for conducting end-to-end dosimetry audits for respiratory motion management of two anatomical treatment sites. The design enables radiochromic film measurements of the dose administered to the target throughout the respiratory cycle (motion-included) and the dose delivered to the time-averaged motion of the phantom (motion-excluded) to be conducted simultaneously.

Purpose: To demonstrate the phantom's utility in a dosimetry audit and capacity to detect errors by quantifying spatial and dosimetric reproducibility.

Methods: Spatial and dosimetric reproducibility was quantified by repeat exposures using a simple lateral beam. Five exposures per measurement configuration were used. In each series of five measurements, the median film was used as the series reference to quantify the reproducibility of the remaining "test films." Spatial reproducibility was quantified by comparing the position of isodose lines in two axes on the test films back to the series reference. Dosimetric reproducibility was quantified using gamma comparison between each test film and the series reference. Proof-of-concept of the motion-excluded measurement capability was also established by comparing all films to treatment planning system (TPS) calculated dose distributions.

Results: Spatial reproducibility was better than 1 mm on all assessed metrics across all measurements. Film-to-film local gamma passing rates at 3%/0.6 mm were above 90% for all measurements. Film-to-TPS global gamma passing rates at 3%/1 mm were >95% in the motion-excluded measurement series', but <80% in the motion-included series, highlighting the utility of the motion-excluded measurements.

Conclusions: Measurements were highly reproducible and of sufficient accuracy/reproducibility to facilitate multiple avenues of analysis in a prospective dosimetry audit. Motion-excluded measurements were directly comparable to the TPS dose distribution. Motion-included measurements may yield more clinically-relevant information about the actual dose administered to the target. This promises greater sensitivity to motion management-related errors, detectable in the setting of a dosimetry audit for motion management.

一种用于运动管理审核的新型剂量学模型的设计和验证。
背景:我们提出了一种新颖的幻体设计,用于对两个解剖治疗部位的呼吸运动管理进行端到端剂量学审计。该设计使放射致色膜测量在整个呼吸周期(包括运动)中给靶的剂量和给幻体的时间平均运动(不包括运动)的剂量同时进行。目的:演示幻影在剂量学审计中的效用,以及通过量化空间和剂量学重复性来检测错误的能力。方法:采用简单侧束重复照射,定量测定空间和剂量学的重复性。每个测量配置使用五次曝光。在每个系列的五次测量中,中位膜被用作系列参考,以量化剩余“测试膜”的可重复性。空间再现性是通过比较测试片上的等剂量线在两个轴上的位置与系列参考来量化的。剂量学的可重复性通过每个测试膜和系列参考之间的伽马比较来量化。通过将所有薄膜与治疗计划系统(TPS)计算的剂量分布进行比较,还建立了运动排除测量能力的概念验证。结果:在所有测量中,所有评估指标的空间再现性均优于1 mm。胶片到胶片的局部伽马通过率为3%/0.6 mm,所有测量结果均高于90%。在排除运动的测量系列中,薄膜到tps的总体伽马通过率为3%/1 mm,但结论是:测量具有高度可重复性,具有足够的准确性/可重复性,可以在前瞻性剂量学审计中促进多种分析途径。排除运动的测量结果与TPS剂量分布有直接的可比性。包含运动的测量可以产生更多的临床相关的信息,关于实际剂量给药的目标。这保证了对运动管理相关错误的更高灵敏度,在运动管理的剂量学审计设置中可以检测到。
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
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
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