听骨链螺旋CT三维重建技术及初步临床应用  

Spiral CT Three-dimensional Reconstruction of the Auditory Ossicular

作　　者：齐乃新[1] 师莉芳[1] 白芝兰[1] 孙泓泓[1] 万佩明[1] 

机构地区：[1]西安交通大学第二附属医院CT/MR室,陕西西安710004

出　　处：《实用放射学杂志》2001年第10期737-739,共3页Journal of Practical Radiology

摘　　要：目的　探讨听骨链螺旋CT三维重建技术的临床应用及局限性。方法　采用螺旋CT薄层扫描 (层厚 :1.0mm ) ,Pitch :1.5 ,小视野 (FOV =9.0cm) ,密集重建 (间隔 0 .5mm)。观察 2 2例 ,其中 10例正常 ,12例耳部病变患者 ,所有病例均采用表面遮盖法 (SSD)行听骨链三维重建成像。正常及异常耳的观察阈值分别为 -2 0 0 -5 0 0HU和 10 0 30 0HU。结果　 10例正常耳听骨链重建能直观显示锤、砧骨的大小、形态及相互关系 ,砧镫关节呈“L”形 ,镫骨前后脚及底板显示欠佳。 12例患者中 ,3例胆脂瘤型及 1例肉芽肿型中耳炎患者 ,3D图像显示有不同程度听小骨破坏 ,与手术所见基本相符。 1例肉芽肿型、2例单纯型中耳炎及 2例颞骨骨折患者听骨链 3D图像均显示正常。 2例中耳畸形显示听骨链发育异常。 1例神经鞘瘤病显示听小骨被肿瘤组织破坏。结论　螺旋CT三维重建技术能很好显示正常及异常听骨链的立体影像 ,有利于中耳炎。Objective To assess the clinical application and limitation of 3-D spiral CT of the auditory ossicular chain.Methods Spiral CT scan of the middle ear was performed with 1.0 mm slice thickness at pitch 1.5,9.0 cm filed of view,and 0.5 mm reconstruction interval in 10 nomal subjects and 12 patients with middle ear diseases.With the shaded surface display(SSD)3-D reconstruction of the auditory ossicular chain were done in all the patients,and the threshold values for normal and abnormal auditory ossicular chain were-200~500 HU and 100~300 HU,respectively.Results In 10 subjects with normal ossicular chain 3-D reconstruction images could directly display shapes,sizes and correlation of malleus and incus,and the incusstapedial joint was like 'L'structure,but it was difficult to exhibit the footplate,and anterior and posterior crura of stapes.Of 12 abnormal cases,in 3 cholestesteatomatic cases with chronic otitis media,3-D reconstruction images demonstrated destructions of varying degrees that were in accord with those seen in operation.1 case with granulomas,2 cases with simple type otitis media and 2 cases of temporal bone fracture demonstrated normal auditory ossicular chain.In 2 cases with congenital anomaly,ossicle dysplasia was seen.Showed erosion of tumor to auditory ossicular chain in 1 case with schwannomatosis.Conclusion 3-D spiral;CT could clearly demonstrate three-dimensional images of the auditory ossicular chain,and it is useful to evaluate chronic otitis media,anatomic malformations and diseases of middle ear.

关 键 词：听骨链 中耳 CT 三维重建 

分 类 号：R816.96[医药卫生—放射医学]