在16排螺旋CT图像上颅骨茎突的表现及临床意义

Findings of styloid Process and clinical value of 16-slice spiral CT postprocessing in investigating styloid process in vivo

[目的]探讨16排螺旋CT图像后处理评价颅底茎突解剖的准确性,为临床诊断和治疗茎突综合征提供准确的活体解剖数据。[方法]100例茎突正常受检者行16排螺旋CT检查后,行多层面重建(MPR),曲面重建(CPR),三维表面遮盖显示(SSD),容积显示(VR)4种后处理。分别测量茎突长度、前倾角、内倾角,茎突-颈动脉管外口、茎突-颈静脉孔、茎突-茎乳孔、茎突-乳突、茎突-颈内动脉及茎突-颈内静脉的距离。[结果]茎突长度(24.51±3.05)mm,左侧茎突长度(24.33±3.15)mm,右侧茎突长度(24.69±2.95)mm;前倾角19.35°±2.92°,内倾角24.00°±4.07°。茎突-颈动脉管外口距离(8.53±2.45)mm,茎突-颈静脉孔距离(2.87±0.88)mm,茎突-茎乳孔距离(2.34±0.74)mm,茎突-乳突距离(17.23±1.85)mm。茎突-颈内动脉及茎突-颈内静脉的距离分别为(6.49±1.58)mm,(3.70±1.46)mm。[结论]16排螺旋CT后处理对茎突的活体解剖显示全面、准确,其中多层面重建及三维表面遮盖显示最有价值,可对活体茎突及其周围毗邻关系做出准确、全面的评价。

[Objective]To investigate the value of 16-slice spiral CT（MSCT） postprocessing in styloid process in vivo and provide the vivisection data for diagnosing and curing styloid process syndrome. [ Method] Totally 100 volunteers with normal styloid processes underwent 16-slice spiral CT（MSCT）. Based on the initial datum,4 kinds of postprocessing including multiple planar reconstruction（MPR）, curve planar reconstruction（CPR）, surface shaded display （SSD） and volume rendering （VR） were performed. The length and inclination angle of stytoid processes were measured. The distance of between styloid processes and carotid canal external aperture,jugular foramen, stylomastoid foramen ,mastoid process, internal carotid artery and internal jugular vein were surveyed. [ Result] The average length of styloid processes was 24.51 mm ± 3.05 mm, left was 24.33 mm ± 3.15 mm and right was 24.69 mm ±2.95 mm. The anterior inclination angle was 19.35° ±2.92° and medial was 24.00° ±4.07°. The distance of between styloid processes and carotid canal external aperture, jugular foramen ,stylomastoid foramen ,mastoid process , internal carotid artery and internal jugular vein were 8.53 mm ± 2.45 mm, 2.87 mm ± 0.88 mm, 2.34 mm ± 0.74 mm, 17.23 mm ± 1.85 mm,6.49 mm ± 1.58 mm and 3.70 mm ± 1.46 mm respectively. [ Conclusion] Sixteen-slice Spiral CT postprocessing demonstrate the stytoid processes in vivo accurately and fully, among which multiple planar reconstruction and surface shaded display are more valuable, because they can evaluate the length and inclination of the styloid processes and the distance between the processes and their surrounding structures in vivo more accurately.