A quantitative evaluation on the image-quality parameters and quality assurance thresholds setting of accelerator on-board imaging system

中华放射肿瘤学杂志 Pub Date : 2019-12-15 DOI:10.3760/CMA.J.ISSN.1004-4221.2019.12.009

Huang Jinyan, Pei Yuntong, Ma Yangguang, Wang Haiyang, L. Lele, Guo Yuexin

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Abstract

Objective To achieve quantitative analysis of image quality parameters and establish warning and action thresholds for the on-board imaging (OBI) system of linear accelerator. Methods The Catphan604 phantom was repeatedly scanned in the Full-Fan and Half-Fan CBCT scanning modes on a Varian EDGE linear accelerator, and the software based on Python language development in-house was utilized to analyze image quality parameters, such as CT number linearity, geometric consistency, slice thickness, spatial resolution, uniformity and low-contrast resolution. The quantitative analysis results of each image quality parameter obtained from 16 times of scanning within 16 months were normalized to the mean and the standard deviations were recorded. A run chart analysis was created to determine the warnings and action thresholds. Results The software built in-house can quantitatively analyze the image parameters of the two scanning modes of OBI system. The low-contrast resolution of Half-Fan was better than that of Full-Fan, whereas the spatial resolution of Full-Fan was superior to that of Half-Fan. One standard deviation (1σ) was set as the warning threshold and 2 standard deviations (2σ) as the action threshold, respectively. The tolerance level of Half-Fan was smaller than that of Full-Fan. Conclusion Self-developed software enables quantitative analysis of accelerator image quality parameters, establishes warning and action tolerance of quality assurance and provides guidance for image quality assurance under image-guided radiotherapy specification. Key words: On-board imaging; Image quality; Quantitative evaluation; Threshold setting

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加速器车载成像系统图像质量参数及质量保证阈值设置的定量评价

目的对直线加速器车载成像系统的图像质量参数进行定量分析，建立预警和动作阈值。方法在Varian EDGE线性加速器上以全扇形和半扇形CBCT扫描模式对Catphan604体模进行重复扫描，并利用内部基于Python语言开发的软件分析图像质量参数，如CT数线性、几何一致性、切片厚度、空间分辨率、均匀性和低对比度分辨率。将16个月内16次扫描获得的每个图像质量参数的定量分析结果归一化为平均值，并记录标准偏差。已创建运行图分析以确定警告和操作阈值。结果自制的软件可以定量分析OBI系统两种扫描模式的图像参数。半扇形的低对比度分辨率优于全扇形，而全扇形的空间分辨率优于半扇形。将一个标准偏差（1σ）设置为警告阈值，将两个标准差（2σ）分别设置为行动阈值。半风扇的公差水平小于全风扇。结论自行开发的软件能够定量分析加速器图像质量参数，建立质量保证的预警和行动容忍度，为图像引导放疗规范下的图像质量保证提供指导。关键词：车载成像；图像质量；定量评价；阈值设置

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来源期刊

中华放射肿瘤学杂志

自引率

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发文量

6375

期刊介绍： The Chinese Journal of Radiation Oncology is a national academic journal sponsored by the Chinese Medical Association. It was founded in 1992 and the title was written by Chen Minzhang, the former Minister of Health. Its predecessor was the Chinese Journal of Radiation Oncology, which was founded in 1987. The journal is an authoritative journal in the field of radiation oncology in my country. It focuses on clinical tumor radiotherapy, tumor radiation physics, tumor radiation biology, and thermal therapy. Its main readers are middle and senior clinical doctors and scientific researchers. It is now a monthly journal with a large 16-page format and 80 pages of text. For many years, it has adhered to the principle of combining theory with practice and combining improvement with popularization. It now has columns such as monographs, head and neck tumors (monographs), chest tumors (monographs), abdominal tumors (monographs), physics, technology, biology (monographs), reviews, and investigations and research.