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目的探讨面神经鼓乳段在斜矢状位最佳显示的扫描基线,为面神经鼓乳段疾病的影像诊断和耳显微外科手术治疗提供解剖学依据。方法利用HRCT对16例(32耳)外观无异常的成人颅骨标本行斜矢状位扫描获得层厚为0.625 mm的HRCT图像后,再用火棉胶包埋技术将颞骨标本切制层厚为1mm的连续斜矢状断面标本,选取面神经鼓乳段显示良好的CT图片与对应的切片标本对照观测。结果16例(32耳)在斜矢状位均可完整显示面神经鼓乳段全程,面神经鼓乳段全长为(23.58±1.44)mm,鼓室段到外半规管的距离为(0.75±0.12)mm,面神经鼓室段到鼓室的距离为(0.34±0.08)mm,鼓室段和乳突段的夹角为(108.88±2.49)度。结论颞骨斜矢状位HRCT图像结合对应切片标本能良好显示面神经鼓乳段及其周围结构的解剖位置和毗邻关系,以与正中矢状面成(21.40±4.35)度为扫描基线作斜矢状位扫描显示面神经鼓乳段最佳,对颞骨的影像诊断和耳显微外科手术治疗具有重要意义。
Objective To explore the optimal scan baseline of facial facial drums in oblique sagittal planes and provide anatomical basis for the imaging diagnosis and ear microsurgery of facial drums. Methods HRCT images of 0.625 mm in thickness were obtained from 16 adult (32 ears) skull specimens without abnormal appearance by HRCT. The thickness of the temporal bone specimens was 1mm continuous oblique sagittal section specimens, selected facial drum piece of the facial nerve showed good CT images and the corresponding sections of the control specimens. Results The total length of facial drum was (23.58 ± 1.44) mm and the distance from tympanic segment to the lateral semicircular canal was (0.75 ± 0.12) mm , The distance between the facial nerve tympanic segment and tympanic space was (0.34 ± 0.08) mm, and the angle between tympanic segment and mastoid segment was (108.88 ± 2.49) degrees. Conclusions The oblique sagittal HRCT images combined with the corresponding sections of the temporal bone can well show the anatomical location and adjacent relationship of the facial turbinate and its surrounding structures. The oblique sagittal (21.40 ± 4.35) Bit scan showed the best facial drummere of the temporal bone imaging and ear microsurgery is important.