Abstract: To explore the clinical value of normal inner ear structures. Methods75 recipients without inner ear abnormalities were divided into three groups based on age. All underwent HRCT, the images were transferred to an online workstation for analysis. All cochlear, vestibular, internal auditory cannel (IAC), and the LSCC bony island width were determined. ResultsStructures of the inner ear and internal auditory cannel could be clearly visualized by HRCT. Excluding differences of IAC length in age, no age, side or race-related differences in other inner ear structures were found. The cochlea width and height were (6.27±0.96)mm and (3.47±0.41)mm, the basal turn of cochlea length and lumen diameter were (6.82±0.69)mm and (1.66±0.26)mm, the vestibule width was (2.81±0.42)mm, the vestibule height was (5.76±0.44)mm, the aperture of the inner ear auditory meatus was (6.36±1.66)mm, the width of the internal auditory meatus was (4.99±0.98)mm and the LSCC bony island width was (3.16±0.52)mm. ConclusionThe HRCT measurement criterion of normal inner ear structures was established.

Key words: Labyrinth, Photogrammetry, Tomography, Spiral computed