2.2.4 Measurement protocol
Scans were analysed using ImageJ11https://imagej.nih.gov. The
cochlea and IAC were located on the CT image stack, rotated and oriented
in the cochlear view (12) . The image stack was resliced radially
from the centre of the modiolus at 1° increments for 360° resulting in a
set of 360 mid-modiolar images from which the IAC dimensions could be
measured. Using the round window as a zero-referencing angle, landmarks
defined in Table 1 were selected and measured at 5-degree intervals.