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目的:利用多排螺旋CT的多平面重建(MPR)及容积再现(VR)重建技术,结合显微解剖测量获取锤骨-前庭桥接术中个体化人工镫骨精确塑形必需的相关参数,并探讨CT无创测量的精度。方法:10例中国人无耳疾颞骨随机编号,经GELight Speed Ultra 64排螺旋CT扫描。扫描所得图像经AW4.1工作站进行MPR及VR操作,测量镫骨头至镫骨足板中央的距离(A线)、锤骨短突下缘至镫骨头的距离(B线)及锤骨短突下缘至镫骨足板中央处距离(C线),从而计算AB线间夹角。全部标本完成显微解剖直视操作,获相关参数,数据经SPSS10.0软件进行统计学处理。结果:CT测量及颞骨解剖测量获得A、B、C线长度分别为(3.42±0.86)mm和(3.60±0.94)mm,(3.42±0.80)mm和(2.96±0.42)mm,(5.86±0.60)mm和(6.22±1.10)mm;AB夹角分别为(141.05±30.07)°和(144.57±41.86)°,2组各项一一比较,均差异无统计学意义(P>0.05)。结论:多排螺旋CT的MPR及VR可直观形象地显示颞骨内部各结构之间的空间关系,完成A、B、C线及AB间夹角的精确测量,为锤骨-前庭桥接术中个体化人工镫骨塑形提供临床指导。
OBJECTIVE: To acquire the relevant parameters necessary for the accurate shaping of individualized artificial ridges in masticatory-vestibular bridging using multi-planar reconstruction (MPR) and volume reconstruction (VR) reconstruction of multi-slice spiral CT combined with microdissection measurements Discuss the accuracy of non-invasive CT measurement. Methods: Ten Chinese earless temporal muscles were randomly numbered and scanned by GELight Speed Ultra 64 spiral CT. The images were scanned by AW4.1 workstation for MPR and VR operation to measure the distance from the bones to the center of the stapes footboard (line A), the distance from the lower edge of the malleus to the bones (line B) The distance from the lower edge to the center of the stapes footboard (C line) to calculate the angle between AB lines. All samples were completed microanatomy and direct vision operation, obtained the relevant parameters, the data were statistically processed by SPSS10.0 software. Results: The lengths of A, B and C lines were (3.42 ± 0.86) mm and (3.60 ± 0.94) mm, (3.42 ± 0.80) mm and (2.96 ± 0.42) mm respectively in the CT and temporal bone anatomic measurements (5.86 ± 0.60 ) mm and (6.22 ± 1.10) mm respectively. The angle of AB was (141.05 ± 30.07) ° and (144.57 ± 41.86) °, respectively. There was no significant difference between the two groups (P> 0.05). Conclusion: The multi-slice spiral CT MPR and VR can visually display the spatial relationship between the various structures within the temporal bone to complete the accurate measurement of the angle between the A, B, C lines and AB, The artificial stapes shape to provide clinical guidance.