Naganawa S, Ito T, Fukatsu H, Ishigaki T, Nakashima T, Ichinose N, Kassai Y, Miyazaki M
Department of Radiology, Nagoya University School of Medicine, Japan.
Radiology. 1998 Sep;208(3):679-85. doi: 10.1148/radiology.208.3.9722845.
To prospectively evaluate the sensitivity and specificity of magnetic resonance (MR) imaging in the inner ear with a long echo train, three-dimensional (3D), asymmetric Fourier-transform, fast spin-echo (SE) sequence with use of a dedicated quadrature-surface phased-array coil to detect vestibular schwannoma in the cerebellopontine angle and the internal auditory canal.
In 205 patients (410 ears) with ear symptoms, 1.5-T MR imaging was performed with unenhanced 3D asymmetric fast SE and gadolinium-enhanced 3D gradient-recalled (SPGR) sequences with use of a quadrature surface phased-array coil. The 3D asymmetric fast SE images were reviewed by two radiologists, with the gadolinium-enhanced 3D SPGR images used as the standard of reference.
Nineteen lesions were detected in the 410 ears (diameter range, 2-30 mm; mean, 10.5 mm +/- 6.4 [standard deviation]; five lesions were smaller than 5 mm). With 3D asymmetric fast SE, sensitivity, specificity, and accuracy, respectively, were 100%, 99.5%, and 99.5% for observer 1 and 100%, 99.7%, and 99.8% for observer 2.
The unenhanced 3D asymmetric fast SE sequence with a quadrature-surface phased-array coli allows the reliable detection of vestibular schwannoma in the cerebellopontine angle and internal auditory canal.
前瞻性评估使用专用正交表面相控阵线圈的内耳磁共振（MR）成像长回波链、三维（3D）、不对称傅里叶变换、快速自旋回波（SE）序列检测桥小脑角和内耳道前庭神经鞘瘤的敏感性和特异性。
对205例有耳部症状的患者（410耳），使用正交表面相控阵线圈，采用未增强的3D不对称快速SE序列和钆增强的3D梯度回波（SPGR）序列进行1.5-T MR成像。由两名放射科医生对3D不对称快速SE图像进行评估，以钆增强的3D SPGR图像作为参考标准。
在410耳中检测到19个病变（直径范围2 - 30 mm；平均10.5 mm±6.4[标准差]；5个病变小于5 mm）。对于3D不对称快速SE序列，观察者1的敏感性、特异性和准确性分别为100%、99.5%和99.5%，观察者2的分别为100%、99.7%和99.8%。
使用正交表面相控阵线圈的未增强3D不对称快速SE序列能够可靠地检测桥小脑角和内耳道的前庭神经鞘瘤。
