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目的探讨通过多层螺旋CT各向同性扫描进行薄块最大密度投影(th in slab m aximum intensity projection,ts-M IP)后处理对听小骨的显示能力。方法对35例患者行多层螺旋CT各向同性扫描,然后在工作站进行ts-M IP后处理,观察横断面、冠状面和矢状面ts-M IP对听小骨的显示情况。结果横断面、冠状面和矢状面ts-M IP均能对锤骨、砧骨及锤砧关节进行显示,其中横断面ts-M IP显示砧镫关节较好,并可同时显示锤骨柄及砧骨长脚的全长;冠状面ts-M IP可显示锤骨的全貌;矢状面ts-M IP显示听小骨可很好地避免各结构地重叠。结论通过多层螺旋CT各向同性扫描获得的图像进行ts-M IP后处理,能够很好地显示正常锤骨、砧骨及砧镫关节,其缺点是对镫骨的显示欠佳。
OBJECTIVE: To investigate the ability of ts-M IP to display the auditory ossicles by isotropic scanning of multi-slice spiral CT. Methods Thirty-five patients underwent isotropic scanning with multi-slice spiral CT, and then performed ts-M IP post-processing at the workstation to observe the display of ossicles on ts-M IP of transverse, coronal and sagittal planes. Results The cross-sectional, coronal and sagittal ts-M IP images of the malleus, the incus and the hammer anvil can be seen. The cross-section ts-M IP shows that the anvils and joints are better, The length of the incus long foot; coronal ts-M IP can show the whole picture of the malleus; sagittal ts-M IP shows the ossicles can be well avoided to each structure overlap. Conclusions Ts-M IP post-processing is performed on images obtained by isotropic scanning of multi-slice spiral CT, which can display the normal malleus, incus and anvibular joints well. The disadvantage is the poor display of tarsal bone.