北京生物医学工程

磁共振质量控制标准对比研究

A comparative study of quality control standards of MRI system

作者：刘迪张默

单位：北京市医疗器械检验研究院（北京101111）<br />首都医科大学北京宣武医院放射科（北京100053）通信作者:刘迪。E-mail: loodoo@aliyun.com

关键词：磁共振成像;质量控制;WS/T 263—2006 ；美国放射协会；Kappa系数

分类号：R318

出版年·卷·期（页码）：2022·41·6（628-631）

摘要：

目的探索磁共振成像(magnetic resonance imaging,MRI)系统质量控制标准间的差异。方法按照《医用磁共振成像(MRI)设备影像质量检测与评价规范》(WS/T 263—2006, WS)及美国放射协会(American College of Radiology,ACR)标准的数据采集和处理方法分别对10台在用MRI系统进行性能指标评价，涵盖6个性能评价指标:信噪比、均匀性、层厚、畸变、伪影和高分辨力。通过计算Kappa系数验证上述两个标准在性能指标评价上的一致性。结果高分辨力(Kappa = 1.000 )和伪影(Kappa = 1. 000)的一致性较好,均匀性(Kappa = 0. 421)和层厚(Kappa = 0. 615)的一致性一般，信噪比(Kappa = 0.072)和畸变(Kappa = 0. Ill)的一致性较差。结论对于信噪比要求较高的设备可选择WS作为质量控制标准;对于均匀性和层厚要求较高的设备则可选择ACR作为质量控制标准。建议MRI系统影像质量评价应综合考虑WS和ACR的评价结果。

Objective To explore the differences between tke quality control standards of Magnetic resonance imaging ( MRI) system. Methods According to the data acquisition and processing methods of Specification of image quality test and evaluation for medical magnetic resonance imaging ( MRI) equipment (WS) , and American College of Radiology (ACR) standard,6 performance evaluation indicators of 10 MRI system in use were tested ： signal-to-noise ratio, image uniformity, slice thickness, geometric accuracy, ghosting, and high contrast resolution, and then we computed the Kappa coefficient for measuring agreement of performance evaluation. Results The Kappa coefficient showed that high contrast resolution ( Kappa = 1. 000) and ghosting ( Kappa = 1. 000) had good agreement. Image uniformity ( Kappa = 0. 421) and slice thickness (Kappa = 0. 615 ) had ordinary agreement. Signal-to-noise ratio ( Kappa = 0. 072 ) and geometric accuracy (Kappa = 0. Ill) had poor agreement. Conclusions For the MRI system with high requirements of signal-to- noise ratio, WS was recommend for quality control. For the MRI system with high requirements of image uniformity and slice thickness, ACR was recommend. It was recommended that both results of WS and ACR should be considered when evaluating the image quality of the MRI system.

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