Fig. 2.

Radiographs obtained for each subject following the modified Stenver's view. The angle of the midsagittal plane of the skull made with the film plane at the time of the radiograph is indicated in parentheses. The line going through thetop of the semi-circular- canal middle of the vestibule round windowtop of the superior semicircular canal and the center of the vestibule crosses the electrode array at the estimated site of the round window. The line going through the estimated site of the round window to the center of the first turn of the spiral made by the electrode array is used as the 0° reference line. In cases of deep electrode insertions, the line going through the estimated site of the round window to the center of the second turn of the spiral made by the electrode array is determined as the 720° line.