螺旋CT多平面重建在先天性小耳畸形外耳道及中耳成形术中的应用

目的探讨螺旋CT多平面重建(multi-plane reconstruction,MPR)在对先天性小耳畸形进行外耳道及中耳成形术时的应用价值。方法回顾分析32耳先天性小耳畸形外耳道闭锁患者(均为Schuknecht分型之C型)的资料。采用螺旋CT行HRCT(High resolution CT,高分辨率CT)容积扫描,获取标准横断位及冠状位图像,并利用扫描原始数据作斜横断位、斜矢状位重建,使重建平面同时包含筛区和听小骨,通过横断位及冠状位CT图像确定面神经走行和听小骨形态,通过MPR确定外耳道成形的角度和深度。术中参照上述检查结果进行手术操作。将上述32耳与另外41耳(也为Schuknecht分型之C型)未行MPR者就以下两点进行比较:(1)寻找中耳的成功率;(2)两组病例中术式相同者(均为Ⅰ期外耳道及中耳成形加耳廓重建)的手术时间。结果 (1)行MPR检查的32耳中,29耳顺利找到中耳(90.6%),由于乳突气化不良、面神经畸形等因素,未能寻找到中耳者3耳(9.4%);而在未行MPR者41耳中,28耳顺利找到中耳(68.3%),未能找到中耳者13耳(31.7%)。经卡方检验两组差异具有显著性。(2)采用MPR者平均手术时间为(342.75±41.70)min(n=28),未采用MPR者平均手术时间为(398.48±61.02)min(n=23),经t检验二者差异具有显著性。结论应用螺旋CT多平面重建技术,可以在一次采取数据后,在任意平面重建真实影像,为外耳道和中耳成术形提供正确的角度和深度参考数据,对提高手术成功率,缩短手术时间具有重要价值。

Application of spiral CT and multi-plane reconstruction in ear canal and middle ear reconstruction in congenital microtia

Objective To investigate the value of spiral CT and multi-plane reconstruction(MPR) in guiding ear canal and middle ear reconstruction for patients with congenital microtia.Methods Patients with Schuknecht type C congenital microtia(32 ears) were examined with spiral CT,using continues volume scanning.Axial and coronal images were acquired to determine the route of facial nerve.Images of inclined axial and coronal planes were also obtained on an image work station,allowing viewing of middle ear and cribrifo...