多层螺旋CT对人工耳蜗植入术后电极的评价  

Multi-slice Spiral CT Imaging in the Post-operative Assessment of Cochlear Implanted Electrode △

作　　者：马辉[1] 韩萍[1] 孔维佳[1] 孔祥泉[1] 梁波[1] 田志梁[1] 雷子乔[1] 刘芳[1] 冯敢生[1] 

机构地区：[1]华中科技大学同济医学院附属协和医院放射科,武汉430022

出　　处：《中国医学科学院学报》2006年第1期13-15,i0008,共4页Acta Academiae Medicinae Sinicae

基　　金：湖北省卫生厅科研基金(JX1B057)~~

摘　　要：目的评价多层螺旋CT(MSCT)在人工耳蜗植入术后电极评估中的应用价值。方法对23例已行人工耳蜗植入的患者做MSCT横断面检查及容积再现技术(VRT)重建。扫描参数为:120kV,100mAs,0.75mm准直器宽度,螺距为1,重建层厚1mm,高分辨骨算法重建。对感兴趣耳以0.1mm重建间距、FOV=50mm进行重叠放大重建,将图像传至工作站以VRT对感兴趣耳进行三维重建。结果MSCT横断面图像显示,电极在耳蜗内呈断续点状高密度影,并见少许金属伪影。VRT图像显示,电极在耳蜗内呈螺旋状走行,与耳蜗走行一致。21例植入Combi40+标准型电极患者VRT可清晰分辨每个电极在耳蜗内的位置,2例植入Combi40+压缩电极的患者VRT图像上只能分辨插入耳蜗前段的4～5个电极,其他插入电极相互之间难以区分。VRT显示电极数目的准确率约为87%(20/23)。结论MSCT结合VRT重建可清晰、直观、准确地显示电极在耳蜗内的形态和位置,并能准确显示大部分病例植入电极数目,是人工耳蜗植入术后观察植入电极直观而较准确的方法。Objective To evaluate the usefulness of multi-slice spiral CT （MSCT） in the post-operative assessment of cochlear implanted electrode. Methods Twenty-three cochlear implant recipients were enrolled in this study. All patients were examined with a SOMATOM Sensation 16-slice CT scanner （Siemens） using the following parameters： 120 kV, 100 mAs, 0. 75 mm collimation, 1 mm reconstruction slice thickness and increment, a pitch factor of 1, and a FOV of 100 mm. The axial images of interested ears were reconstructed with 0. 1 mm increment and a FOV of 50 mm, and then volume rendering technique （VRT） reconstruction were done on the work station. Results The electrode arrays were detected on axial CT images. Both inner ear and electrode array could be displayed on one image simultaneously. VRT provided an intuitionistic view of the relationship between electrode array and cochlea. VRT showed the number of the electrode array in 20 patients implanted with Combi 40 ＋ standard electrode array and demonstrated the shape, position, and insertion depth. The electrode array number determined by VRT was in accordance with the surgical findings in 18 patients, and was underestimated in two patients. In 3 patients with Combi 40 ＋ compressed electrode army, only 4 to 5 electrodes arrays were dearly identified and others were not observed. Conclusion MSCT with VRT can provide useful three-dimensional information of the electrode array and indicate the exact relationship between electrode array and cochlea.

关 键 词：多层螺旋CT 容积再现技术 人工耳蜗 

分 类 号：R814.42[医药卫生—影像医学与核医学]