FIG. 3.

Radiographs obtained for each subject after the modified Stenver’s view. The line going through the top 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. Note that subject M16 showed a “bend” at the level of electrodes 9 and 10. This is caused by a fibrosis that was found in the basal turn of this subject at the time of the surgery.