关键词: 外伤；听骨链；X线，体层摄影术；高分辨率

Abstract:

Objective   To evaluate the diagnostic value of maximum intensity projection (MIP)in  high-resolution computed tomography (HRCT)in Incudomalleolar Dislocation after injury. Methods   10  patients  (11 ears) with traumatic head injury were scanned with HRCT, while the original data were processed with multiplanar reformations(MPR )and MIP. From the images generated by these techniques, the ossicular chain structure was observed and compared  with the findings in the operation. Results   Among the 10 patients(11 ears), incudomalleolar dislocations were well visualized in 4 ears on axial CT images, and  3 ears on Multiple Planar Reconstruction coronal CT images. 6 ears of incudomalleolar dislocation were identified by maximum intensity projection (MIP) both in axial and coronal CT images, which were further confirmed by the operation. During the surgery, there were 6 ears with incudomalleolar dislocation, 7 ears with tympanic membrane perforation(combined with incudomalleolar dislocation in 3 ears), and 1 ear with incudostapedial dislocation. Conclusion   Maximum intensity projection with high-resolution CT can improve the diagnosis of incudomalleolar dislocation.

Key words: Injury； Ossicular chain；  Tomography， X-ray computed； High resolution