高分辨率CT多平面重组对半规管病变的诊断价值

目的:探讨高分辨率CT(HRCT)多平面重组对半规管病变的诊断价值,提高对半规管病变的认识。方法:对怀疑上半规管裂缺的患者3例(6耳),突发性聋患者30例(60耳),感音神经性聋患者30例(60耳)及同期进行体检无耳部疾患的患者20例(40耳)行HRCT扫描,对原始数据行多平面重组,观察正常耳各半规管的形态并与病变组相比较。结果:各半规管均表现为不同倾斜度的C形,正常耳上半规管全程斜矢状位表现为"∩",前端与前庭相通,后端与后半规管上半部形成总脚并与前庭相通;外半规管全程轴位呈""形,前后脚与前庭相通;后半规管全程斜矢状位表现为""形,下端与前庭相通,上端与上半规管形成总脚与前庭相通。半规管管腔平滑,骨质无缺损。发现上半规管裂1耳;突发性聋组前庭导水管与上半规管相通1耳,与后半规管相通2耳;感音神经性聋上半规管闭塞1耳,外半规管闭塞2耳,外半规管骨质不完整2耳,上半规管粗短2耳、外半规管与前庭融合4耳、后半规管短小2耳。结论:HRCT扫面多平面重组能全程观察各半规管,对诊断半规管病变具有重要价值,值得临床推广。

The diagnostic value of multi-planar reconstruction in semicircular canals disease by HRCT

Objective:To study the diagnostic value of high-resolution computed tomography(HRCT) and multiplanar reconstruction(MPR) in assessment of semicircular canals disease.Method: Eighty-three patients were scanned with HRCT and the original data were processed with MPR.The semicircular canals full length was respectively observed in one image of MPR in the normal ears.The abnormal location of the canal were observed.Result:In one image the full length of the horizontal,superior and posterior semicircular canal can be respectively displayed in one image of MPR in normal ears.By this way,1 superior semicircular canal dehiscence(SSCD)was found in precaution group,1 superior and 2 horizontal semicircular canal blocked,1 vestibular aqueduct(VA) joined into superior semicircular canal and 2 VAsjoined into posterior semicircular canal and abnormity of the three semicircular canals were found in SNHL.Conclusion:MPR canould display the three canals full length in one picture and have a high specificity in the diagnosis of the semicircular canal abnormity.