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blique multi- ructions of mplanted co- and without a positioner ly, a medial sition of the array. Three- nstructions MSCT scans, epths of the seen on A) of de arrays dis- B. The dia- he coordinate etermine the The angle sertion angle contact ex- rees, and d distance from e modiolus.

833 pps/contact (75 sec/phase) was used. At 6 mos, 26 patients of the 45 patients used a HiRes strategy programmed with the BEPS software package, whereas 37 patients were using the HiRes strategy at 1 yr of follow-up (1400 pps/contact, 21 sec/ phase, ranging from 8 to maximally 16 active contacts). In the Discussion section, we argue that HiRes experience is probably not a contributing factor to any differences in speech perception scores between the P- and NP-groups. For all electrode contacts, the thresholds (T-levels) and Fig. 1. Typical oblique multiplanar reconstructions of MSCT scans of implanted cochleas with (A) and without (B) the use of a positioner show, respectively, a medial and a lateral position of the basal electrode array. Three-dimensional-reconstructions (C & D), using the MSCT scans, show insertion depths of the apical tips (not seen on A) of the same electrode arrays displayed in A and B. The diagram (E) shows the coordinate system used to determine the insertion angle. The angle ð illustrates the insertion angle of an electrode contact expressed in degr es, and d shows the radial distance from this contact to the modiolus.

48 | Chapter 3 evels, and Dynamic Range in this study used a CIS strategy. patients in the P-group, who were h a HiRes strategy, the first 3 mos the al part of the cochlea were calcu- sition of the electrode contact was the cumulative angle between those rdinate system, based on Chen et al. strated in Figure 1E.