3.0T MRI肩关节PROPELLER技术与常规扫描技术的对比研究

Comparison of PROPELLER and Conventional FSE MRI for the Shoulder

目的探讨磁共振螺旋桨采集(periodically rotated overlapping parallel lines with enhanced reconstruction,PROPELLER)技术在提高肩关节MRI图像质量、减少及消除运动伪影方面的作用。方法对79例肩关节MR扫描的患者行3.0T MRI常规FSE T2WI扫描后加扫PROPELLER FSE T2WI序列。扫描后的图像由2位诊断医师对运动伪影、呼吸伪影、血管搏动伪影、图像总体质量和冈上肌边缘进行5等级评分。常规扫描与相同方位的PROPELLER序列图像之间的对比采用Wilcoxon秩和检验。结果常规FSE T2WI扫描序列中8例因严重运动伪影无法用于诊断,而PROPELLER FSE T2WI序列图像运动伪影明显降低,评分范围3～4,平均值3.89;肩关节MR PROPELLER扫描能显著降低运动伪影、呼吸伪影及血管搏动伪影(均P<0.05),等级评分均在3级及以上;图像质量显著提高,总体评分在2级及以上(P<0.05);冈上肌边缘更加清晰、锐利。结论与肩关节常规FSE T2WI相比,PROPELLER技术能显著降低运动、呼吸及血管搏动伪影,提高图像总体质量,显示更细微的解剖结构,为临床提供更优质的诊断图像。

Objective To compare the periodically rotated overlapping parallel lines with enhanced reconstruction（PROPELLER）MRI and conventional FSE T2WI for the shoulder in terms of reducing motion artifacts and improving image quality.Methods PROPELLER and FSE examinations on the shoulders of 79patients were performed on a 3.0Tscanner.All images were evaluated by two radiologists using a 5-point scale（motion artifacts,respiratory artifacts,pulsatility artifacts,overall image quality,and the edge of the supraspinatus）.Wilcoxon rank sum test was used for statistical analysis.Results Compared with PROPELLER images,the conventional FSE sequence showed severe motion artifacts,which could not be used for diagnosis in 8cases.The mean score of PROPELLER sequence was 3.98,at a range of 3-4.The motion artifacts,respiratory artifacts and pulsatility artifacts were significantly reduced on PROPELLER images compared with conventional FSE images（P〈0.05）,and the PROPELLER images were rated 3and above and the image quality was significantly improved with PROPELLER images on which clearer and sharper edge of the supraspinatus was shown.Conclusion The overall image quality is improved,respiratory and pulsatility artifacts reduced and more subtle anatomic structures seen with PROPELLER compared with conventional FSE T2WI.