Anatomical Evaluation of Oval Windows in Stapedial Lesion by Ultra-High Resolution Computed Tomography

By June 7, 2019

Suzuki, Mikio1; Higa, Teruyuki 1; Akazawa, Yukinori1; Kondo, Shunsuke1
1 Department of Otorhinolaryngology, Head and Neck surgery, University of the Ryukyus, Okinawa, Japan

Aquilion PrecisionTM (hereafter AP), which is one of the ultra-high resolution computed tomography, has 0.25 mm X 1792 channel, 0.4 mm X 0.5 mm focal spot, 2 times better accuracy, and 2048 matrix UHR MBIR reconstruction. Since it has better spatial resolution than multi-detector raw CT, it may be useful to detect anatomical information related otologic surgery. Subjects and

– retrospective case review, tertiary referral center, diagnostic
Subjects were 40 patients with chronic otitis media, sudden deafness, or facial palsy as control and 5 cases (2 males and 3 females) with three otosclerosis and 2 ossicular chain malformation with stapes fixation confirmed by otologic surgery.

-Main Outcome Measure: Evaluation of oval windows lesion by AP
-Results: The mean and standard deviation of foot plate thickness in the control group was 0.46 mm and 0.08 in the right ears and 0.46 mm ± 0.08 in the left ears, respectively. There was no significant difference between right and left. The otosclerosis cases had 1.08 mm in affected ears and 0.82 mm in the unaffected ears, respectively. The bony changes were identified in all affected ears and there was no subject with such bony change in the control. The thickness of footplate in ossicular malformations was 1.08 mm in the affected ears, and 0.58 mm in the unaffected ears, respectively. The bony fixation of stapes and surrounding bone were observed in all malformation cases.
-Conclusion: The CT information obtained by AP is useful to evaluate the stapes condition.