123 / 162
121
6
of this method of measuring the rotational angle and the distance to the modiolus was validated previously
[Verbist et al., 2010a]. Because the scanning protocol was in development during the first inclusion period,
17 subjects had CT scans that were not of sufficient quality to allow multi-planar reconstructions. Those
patients were not included in this study (Table 2).
Van der Beek: Differences in levels along CI array
25
Table 2:
Number of implanted patients excluded from the study.
Patients excluded from study:
Number:
Mentally handicapped
Non-Dutch speaker
Deceased, natural cause
Facial-nerve stimulation
Incomplete insertion
Device failure
No follow-up level data available
Could not reconstruct CT data
5
1
3
1
2
3
4
17
Total
36
F.B. van der Beek
Figure 1
Figure 1:
Multiplanar reconstruction of a post-implantation CT scan showing the intra-cochlear location of the individual contacts. The
arrows indicate the distance to the modiolus and the insertion depth of the most basal electrode contact.