Harnsberger H R, Dahlen R T, Shelton C, Gray S D, Parkin J L
Department of Radiology, University of Utah Health Sciences Center, Salt Lake City 84132, USA.
Laryngoscope. 1995 Oct;105(10):1037-42. doi: 10.1288/00005537-199510000-00005.
The purpose of this report is to compare temporal bone computed tomography (CT) to high-resolution magnetic resonance (MR) imaging using a novel thin-section fast spin echo (FSE) pulse sequence in identifying and characterizing patients with large vestibular aqueduct syndrome. Sixteen patients with sensorineural hearing loss and a CT diagnosis of large vestibular aqueduct(s) underwent high-resolution fast spin echo magnetic resonance imaging with dual, 3-in phased array receiver coils centered over the external auditory canals. Magnetic resonance imaging parameters included axial and oblique sagittal fast spin echo with an effective slice thickness of 1 mm contiguous. Thirty-eight patients with 76 normal inner ears who underwent MR imaging using this technique had their endolymphatic duct measured. MR alone identified the enlarged endolymphatic sac seen along with the large endolymphatic duct in all cases. Three cases (five inner ears) with enlarged bony vestibular aqueducts on CT showed no evidence of endolymphatic duct or sac enlargement on MR. MR alone identified a single case of mild cochlear anomaly in conjunction with an enlarged endolymphatic duct and sac. In the normal population the size of the normal endolymphatic duct at its midpoint measured from 0.1 to 1.4 mm. Thin-section, high-resolution fast spin echo MR imaging of the inner ear may be superior to CT in the evaluation of patients with the large vestibular aqueduct syndrome.
本报告的目的是使用一种新型的薄层快速自旋回波（FSE）脉冲序列，比较颞骨计算机断层扫描（CT）与高分辨率磁共振（MR）成像在识别和表征大前庭导水管综合征患者方面的情况。16例感音神经性听力损失且CT诊断为大前庭导水管的患者接受了高分辨率快速自旋回波磁共振成像，使用置于外耳道上方的双3英寸相控阵接收线圈。磁共振成像参数包括轴向和斜矢状面快速自旋回波，有效层厚1mm且连续。38例接受该技术磁共振成像的患者（共76只内耳正常）测量了内淋巴管。单独磁共振成像在所有病例中均识别出与大内淋巴管同时出现的扩大的内淋巴囊。3例（5只内耳）CT显示骨前庭导水管扩大的病例，磁共振成像未显示内淋巴管或囊扩大的证据。单独磁共振成像识别出1例轻度耳蜗异常合并内淋巴管和囊扩大的病例。在正常人群中，正常内淋巴管中点的大小为0.1至1.4mm。内耳的薄层、高分辨率快速自旋回波磁共振成像在评估大前庭导水管综合征患者方面可能优于CT。
