Objective    To assess the clinical  value of multi-slice CT (MSCT) in showing the ear lesions.     Methods    MSCT high resolution scan images of 52 ears of 11 normal adult and 15 patients with hearing loss were reconstructed

by bone plus with 0.625 mm collimation

9.6 cm small field of vision（FOV）and 0.3 mm reconstruction interval before volume rendering (VR) and multiplanar reformation (MPR) were performed.      Results    VR

MIP and MPR images of 40 normal ears clearly showed the complicated anatomic structures. VR

MIP and MPR images of twelve abnormal ears displayed 3 ears of malformations of crus longum incudis

1 ear of destructed  semicircular canals

2 ears of malleus dysplasia

2 ears of fusion of incudostapedial joint

2 ears of bony atresia of external auditory complicated with auditory ossicles dysplasia

and 2 ears of crus stapedis dysplasia. MPR is easier to manipulate than VR that has three dimensional effect butis difficult to handle.     Conclusion    HRCT images

combined with post-processing technique of VR

MIP and MPR

can clearly show the anatomic structures and lesions of middle and inner ears.