北京生物醫(yī)學(xué)工程

磁共振質(zhì)量控制標(biāo)準(zhǔn)對(duì)比研究

A comparative study of quality control standards of MRI system

作者：劉迪張默

單位：北京市醫(yī)療器械檢驗(yàn)研究院（北京101111）<br />首都醫(yī)科大學(xué)北京宣武醫(yī)院放射科（北京100053）通信作者:劉迪。E-mail: [email protected]

關(guān)鍵詞：磁共振成像;質(zhì)量控制;WS/T 263—2006 ；美國放射協(xié)會(huì)；Kappa系數(shù)

分類號(hào)：R318

出版年·卷·期（頁碼）：2022·41·6（628-631）

摘要：

目的探索磁共振成像(magnetic resonance imaging,MRI)系統(tǒng)質(zhì)量控制標(biāo)準(zhǔn)間的差異。方法按照《醫(yī)用磁共振成像(MRI)設(shè)備影像質(zhì)量檢測與評(píng)價(jià)規(guī)范》(WS/T 263—2006, WS)及美國放射協(xié) 會(huì)(American College of Radiology,ACR)標(biāo)準(zhǔn)的數(shù)據(jù)采集和處理方法分別對(duì)10臺(tái)在用MRI系統(tǒng)進(jìn)行性能指標(biāo)評(píng)價(jià)，涵蓋6個(gè)性能評(píng)價(jià)指標(biāo):信噪比、均勻性、層厚、畸變、偽影和高分辨力。通過計(jì)算Kappa系數(shù)驗(yàn)證上述兩個(gè)標(biāo)準(zhǔn)在性能指標(biāo)評(píng)價(jià)上的一致性。結(jié)果高分辨力(Kappa = 1.000 )和偽影(Kappa = 1. 000)的一致性較好,均勻性(Kappa = 0. 421)和層厚(Kappa = 0. 615)的一致性一般，信噪比(Kappa = 0.072)和畸變(Kappa = 0. Ill)的一致性較差。結(jié)論對(duì)于信噪比要求較高的設(shè)備可選擇WS作為質(zhì)量控制標(biāo)準(zhǔn);對(duì)于均勻性和層厚要求較高的設(shè)備則可選擇ACR作為質(zhì)量控制標(biāo)準(zhǔn)。建議MRI系統(tǒng)影像質(zhì)量評(píng)價(jià)應(yīng)綜合考慮WS和ACR的評(píng)價(jià)結(jié)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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