用于日常磁共振成像质量保证的自动图像处理工作流程。

An Automatic Image Processing Workflow for Daily Magnetic Resonance Imaging Quality Assurance.

作者信息

Peltonen Juha I, Mäkelä Teemu, Sofiev Alexey, Salli Eero

机构信息

HUS Medical Imaging Center, Radiology, University of Helsinki and Helsinki University Hospital, P.O. Box 340, FI-00029, Helsinki, Finland.

Department of Neuroscience and Biomedical Engineering, Aalto University School of Science, P.O. Box 15100, Espoo, Finland.

出版信息

J Digit Imaging. 2017 Apr;30(2):163-171. doi: 10.1007/s10278-016-9919-4.

Abstract

The performance of magnetic resonance imaging (MRI) equipment is typically monitored with a quality assurance (QA) program. The QA program includes various tests performed at regular intervals. Users may execute specific tests, e.g., daily, weekly, or monthly. The exact interval of these measurements varies according to the department policies, machine setup and usage, manufacturer's recommendations, and available resources. In our experience, a single image acquired before the first patient of the day offers a low effort and effective system check. When this daily QA check is repeated with identical imaging parameters and phantom setup, the data can be used to derive various time series of the scanner performance. However, daily QA with manual processing can quickly become laborious in a multi-scanner environment. Fully automated image analysis and results output can positively impact the QA process by decreasing reaction time, improving repeatability, and by offering novel performance evaluation methods. In this study, we have developed a daily MRI QA workflow that can measure multiple scanner performance parameters with minimal manual labor required. The daily QA system is built around a phantom image taken by the radiographers at the beginning of day. The image is acquired with a consistent phantom setup and standardized imaging parameters. Recorded parameters are processed into graphs available to everyone involved in the MRI QA process via a web-based interface. The presented automatic MRI QA system provides an efficient tool for following the short- and long-term stability of MRI scanners.

摘要

磁共振成像(MRI)设备的性能通常通过质量保证(QA)程序进行监测。QA程序包括定期进行的各种测试。用户可以执行特定的测试,例如每天、每周或每月一次。这些测量的确切间隔根据部门政策、机器设置和使用情况、制造商的建议以及可用资源而有所不同。根据我们的经验,在当天第一位患者之前采集的单幅图像可以轻松有效地进行系统检查。当使用相同的成像参数和体模设置重复此每日QA检查时,这些数据可用于得出扫描仪性能的各种时间序列。然而,在多台扫描仪的环境中,手动处理每日QA会很快变得繁琐。全自动图像分析和结果输出可以通过缩短反应时间、提高可重复性以及提供新颖的性能评估方法,对QA过程产生积极影响。在本研究中,我们开发了一种每日MRI QA工作流程,该流程可以用最少的人工操作来测量多个扫描仪性能参数。每日QA系统围绕放射技师在一天开始时拍摄的体模图像构建。该图像通过一致的体模设置和标准化的成像参数获取。记录的参数被处理成图表,通过基于网络的界面供参与MRI QA过程的每个人使用。所展示的自动MRI QA系统为跟踪MRI扫描仪的短期和长期稳定性提供了一个有效的工具。

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