Image analysis
The routine sequence is utilized for the purpose of excluding neoplastic
lesions of the brain and inner ear, as well as malformations of the
inner ear. According to Kim’s method of measuring signal
intensity9, we selected a 4 mm2 region of interest
located at the optimal display position of the bilateral inner auditory
canal bottom, we conducted three measurements and calculated the average
value. A 50mm2 region of interest (ROI) was selected from the bilateral
cerebellar white matter at the same level (Figure1a ). The
signal intensity ratio between the average signal intensity at the IAC
bottom on the affected side and unaffected side were calculated. The
signal intensity ratio served as an indicator of the extent of
enhancement at the IAC bottom, while our previous measurements were
utilized to evaluate the degree of cochlear and vestibular
hydrops8, 10. The images of all patients were assessed
in a double-blind manner by two experienced imaging diagnostic
physicians with 30 years of expertise, and the mean value of their
measurements was calculated.