Feasibility study of structural similarity index for patient-specific quality assurance

IF 2 4区 医学 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
Jae Choon Lee, Hyeong Wook Park, Young Nam Kang
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引用次数: 0

Abstract

Background

The traditional gamma evaluation method combines dose difference (DD) and distance-to-agreement (DTA) to assess the agreement between two dose distributions. However, while gamma evaluation can identify the location of errors, it does not provide information about the type of errors.

Purpose

The purpose of this study is to optimize and apply the structural similarity (SSIM) index algorithm as a supplementary metric for the quality evaluation of radiation therapy plans alongside gamma evaluation. By addressing the limitations of gamma evaluation, this study aims to establish clinically meaningful SSIM criteria to enhance the accuracy of patient-specific quality assurance (PSQA).

Methods

We analyzed the relationship between the gamma passing rate (GPR) and the SSIM index with respect to distance and dose errors. For SSIM analysis corresponding to gamma evaluation criteria of 3%/2 mm, we introduce the concept of SSIM passing rate (SPR). We determined a valid SSIM index that met the gamma evaluation criteria and applied it. Evaluations performed for 40 fields measured with an electronic portal imaging device (EPID) were analyzed using the GPR and the applied SPR.

Results

The study results showed that distance errors significantly affected both the GPR and the SSIM index, whereas dose errors had some influence on the GPR but little impact on the SSIM index. The SPR was 100% for distance error of 2 mm but began to decrease for distance errors of 3 mm or more. An optimal SSIM index threshold of 0.65 was established, indicating that SPR fell below 100% when distance errors exceeded 2 mm.

Conclusions

This study demonstrates that the SSIM algorithm can be effectively applied for the quality evaluation of radiation therapy plans. The SPR can serve as a supplementary metric to gamma evaluation, offering a more precise identification of distance errors. Future research should further validate the efficacy of SSIM algorithm across a broader range of clinical cases.

Abstract Image

结构相似指数用于患者特异性质量保证的可行性研究。
背景:传统的伽玛评价方法结合剂量差(DD)和一致性距离(DTA)来评价两种剂量分布之间的一致性。然而,虽然伽马评估可以识别错误的位置,但它不能提供有关错误类型的信息。目的:本研究的目的是优化并应用结构相似度(SSIM)指数算法作为放射治疗方案质量评价的补充指标。通过解决伽马评估的局限性,本研究旨在建立具有临床意义的SSIM标准,以提高患者特异性质量保证(PSQA)的准确性。方法:分析伽玛通过率(GPR)与SSIM指数在距离和剂量误差方面的关系。对于对应于3%/ 2mm伽马评价标准的SSIM分析,我们引入了SSIM通过率(SPR)的概念。我们确定了一个有效的符合gamma评价标准的SSIM指数并应用了它。利用探地雷达和应用SPR对电子门静脉成像装置(EPID)测量的40个油田进行了评价分析。结果:研究结果表明,距离误差对探地雷达和SSIM指数均有显著影响,而剂量误差对探地雷达有一定影响,但对SSIM指数影响不大。距离误差为2 mm时,SPR为100%,距离误差大于等于3 mm时,SPR开始下降。建立了最优的SSIM指数阈值为0.65,表明距离误差超过2 mm时,SPR降至100%以下。结论:本研究表明,SSIM算法可以有效地应用于放射治疗方案的质量评价。SPR可以作为伽马评估的补充度量,提供更精确的距离误差识别。未来的研究应在更广泛的临床病例中进一步验证SSIM算法的有效性。
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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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