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Objective:Research the utility of three-dimensional reconstruction of Multi-slice Spiral CT(including MPR,SSD,MIP,VRT) for demonstration and diagnosis of ear pathological change.To tests the normal group and ear disease group by the above method and Multi-slice Spiral CT scanning. Separately carries on the diagnosis with kinds of inspection technology,take the final pathology result as the reference,compare accurate rate and the sensitivity of these diagnosis methods.Discussing its application value in diagnosis,appraising the curative effect after the treatment and the follow-up visit.Method:Collect kinds of cases,normal group has 84ears,inner ear with congenital malformation group has 10ears,chronic tympanitis has 41 ears.All groups have adopted the 64-slice CT scanner axial scan.Subjects are supine, baseline is the canthomeatal line,scanning range from the external auditory foramen lower edge to the os petrosum upper edge,thickness is 0.75mm, collimator width is 0.75mm.After scanning,in 3D control panel,along the long axis of bone in free model,axial images and coronal images are post-processed with MPR,MIP,SSD and VRT.Valuing the advantages and disadvantages of reconstruction method for showing the inner ear disease.Results:1、The correct rate is 100%,which MPR,MIP,SSD,VRT for diagnosis the destroys of head of malleus,the handle of malleus,the body of incus; the correct rate is 100%for diagnosis the destroys of the ossicular chain.2、Demonstration rate of ear hammer,the anvil and the stirrup bone is 100%when MIP is used in no pathological change group,although cannot demonstrate stirrup instep,but the integrity of ossicular chain can be decided.3、SSD can show structure of the middle ear clearly,including roof of tympanum, sigmoid sinus,bone wall,scutal shield and aditus ad antrum.Facial nerve pore, labyrinthus and stirrup are can’t show clearly.4、VRT can show structure of the inner ear clearly,including base of cochlea,vestibule,bulb and common crus of canalis semicirculares,fossula rotunda,fenestra ovalis.Top and center of cochlea are can’t show clearly.Conclusion:Malleus,incus,a hammer,incudomallear articulation, incudostapedial articulation can be demonstrated vividly.Facial nerve can be also show clearly in anteroposterior axes oblique position.A powerful image basis can be provided for surgery.Providing a basis for the diagnosis of tympanitis、inner ear malformation and implanting of artificial cochlea.Three-dimensional reconstruction of Multislice CT has important clinical value in diagnosis and program development of facial paralysis caused by the temporal bone fracture.Three-dimensional reconstruction of Multislice CT can be used as a routine examination of middle ear disease
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