Soulié D, Cordoliani Y S, Derosier C, Jeanbourquin D, Vignaud J, Cosnard G
Service d'Imagerie Médicale, HIA du Val-de-Grâce, Paris.
J Radiol. 1995 Feb-Mar;76(2-3):93-100.
To compare prospectively high resolution fast spin echo T2 weighted (FSE-T2W) images and gadolinium-enhanced spin echo T1 weighted images for diagnosis of pathology of the internal auditory meatus (IAM).
114 patients underwent MR imaging at 1.5 T with the following protocol: axial images; whole brain FSE-T2W sequence (256 matrix); 2 sequences focused on IAM with high resolution FSE-T2W acquisitions (512 matrix, 3 mm sections with 1.5 mm overlapping); pre and postcontrast T1 weighted sequences focused on IAM. Examinations were viewed by senior neuroradiologists.
31 lesions were detected in the IAM by high resolution FSE-T2W images; 25 lesions were found in the IAM by postcontrast T1 weighted images, i.e. 6 false-positive results and none false-negative. On the basis of 228 studied IAMs the sensitivity, specificity and negative predictive value of this high resolution FSE-T2W sequence were 100%, 97% and 100% respectively.
Gadolinium enhanced sequence is not indispensable if high resolution FSE-T2W images are normal. Gadolinium-enhanced sequence remains essential in others equivocal cases (difficult diagnosis or abnormal IAM).
前瞻性比较高分辨率快速自旋回波T2加权（FSE-T2W）图像和钆增强自旋回波T1加权图像对内耳道（IAM）病变的诊断价值。
114例患者接受了1.5T磁共振成像检查，检查方案如下：轴位图像；全脑FSE-T2W序列（256矩阵）；2个序列聚焦于IAM，采用高分辨率FSE-T2W采集（512矩阵，3mm层厚，层间距1.5mm）；聚焦于IAM的对比剂前和对比剂后T1加权序列。由资深神经放射科医生进行检查。
高分辨率FSE-T2W图像在IAM中检测到31个病变；对比剂后T1加权图像在IAM中发现25个病变，即有6例假阳性结果，无假阴性结果。基于228个研究的IAM，该高分辨率FSE-T2W序列的敏感性、特异性和阴性预测值分别为100%、97%和100%。
如果高分辨率FSE-T2W图像正常，钆增强序列并非必不可少。钆增强序列在其他疑难病例（诊断困难或IAM异常）中仍然至关重要。
