Erwin L. Hahn Institute for Magnetic Resonance Imaging, University Duisburg-Essen, Essen, Germany.
Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, University Duisburg-Essen, Hufelandstr. 55, 45147, Essen, Germany.
Eur Radiol Exp. 2020 Feb 7;4(1):10. doi: 10.1186/s41747-019-0142-1.
To evaluate feasibility and diagnostic performance of clinical 7-T magnetic resonance imaging (MRI) of the shoulder.
Eight patients with suspected lesions of the rotator cuff underwent 7-T MRI before arthroscopy. Image quality was scored for artifacts, B inhomogeneities, and assessability of anatomical structures. A structured radiological report was compared to arthroscopy. In four patients, a visual comparison with pre-existing 1.5-T examinations was performed.
Regarding image quality, the majority of the sequences reached values above the middle of each scoring scale. Fat-saturated proton density sequences showed least artifacts and best structure assessability. The most homogenous B field was reached with gradient-echo sequences. Arthroscopy did not confirm tendinopathy/partial tear of supraspinatus in 5/8 patients, of subscapularis in 5/6, and of infraspinatus in one patient; only a partial lesion of the subscapularis tendon was missed. Pathologic findings of long bicipital tendon, acromioclavicular joint, glenohumeral cartilage, labrum, and subacromial subdeltoideal bursa were mainly confirmed; exceptions were one lesion of the long bicipital tendon, one subacromial bursitis, and one superior glenoid labrum anterior-to-posterior lesion, missed on 7-T MRI. Evaluating all structures together, sensitivity was 86%, and specificity 74%. A better contrast and higher image resolution was noted in comparison to previous 1.5-T examinations.
7-T MRI of the shoulder with diagnostic image quality is feasible. Overrating of tendon signal alterations was the main limitation. Although the diagnostic performance did not reach the current results of 3-T MRI, our study marks the way to implement clinical 7-T MRI of the shoulder.
评估肩部临床 7-T 磁共振成像（MRI）的可行性和诊断性能。
8 例疑似肩袖病变患者在关节镜检查前接受了 7-T MRI 检查。对伪影、B 不均匀性和解剖结构可评估性进行图像质量评分。将结构化的放射学报告与关节镜检查进行比较。在 4 例患者中，与预先存在的 1.5-T 检查进行了视觉比较。
在图像质量方面，大多数序列的评分值均高于每个评分尺度的中间值。脂肪饱和质子密度序列显示出最少的伪影和最佳的结构可评估性。梯度回波序列达到了最均匀的 B 场。关节镜检查未在 8 例患者中的 5 例中确认肩袖冈上肌的肌腱病/部分撕裂，在 6 例中的 5 例中未确认肩胛下肌的肌腱病，在 1 例中仅错过肩胛下肌肌腱的部分病变；仅错过肩胛下肌腱的一个病变，喙锁关节，肩肱关节软骨，盂唇和肩峰下三角肌下滑囊的病理发现主要得到证实；7-T MRI 漏诊了一个长二头肌肌腱病变，一个肩峰下滑囊炎和一个盂上唇前-后病变。综合评估所有结构，灵敏度为 86％，特异性为 74％。与以前的 1.5-T 检查相比，观察到对比度更好，图像分辨率更高。
具有诊断图像质量的肩部 7-T MRI 是可行的。主要的限制是肌腱信号改变的高估。尽管诊断性能未达到当前 3-T MRI 的结果，但我们的研究为实施肩部临床 7-T MRI 开辟了道路。
