Determining optimal cochlear implant electrode array with OTOPLAN

Figures & data

Table 1. Patient characteristics evaluated in this study (n = 105).

Characteristic
	Number
Sex
Male	40
Female	65
Implanted ear
Right	55
Left	50
Inserted cochlear implant device
FLEX SOFT	18
FLEX 28	78
FLEX 26	1
FLEX 24	8
	Mean ± SD
Implantation age in years	42.3 ± 29.0

Figure 1. Histogram with a normal distribution curve (n = 105) of each CDL measured using OTOPLAN ver. 3.0. The average, maximum, and minimum CDLs were 35.1, 39.1 and 31.7 mm, respectively. CDL: cochlear duct length.

Figure 2. Comparison of CDL by sex (Male: n = 40, female: n = 65), laterality (right: n = 55, left: n = 50) and implantation age. Unpaired t-test (A,B) and linear regression (C) analysis were perfomed. CDL: cochlear duct length.

Figure 3. Correlation between AID via OTOPLAN preoperatively and that measured by postoperative radiographs. Linear regression analysis was performed. AID: angular insertion depth.

Figure 4. Image modified from the OTOPLAN results and postoperative radiographs. Each degree means the position of the tip channel (C1) of the electrode according to each selected electrode array. (A) In case #99, FLEX 28 was selected. (B) In case #103, FLEX SOFT was selected. CDL: cochlear duct length; AID: angular insertion depth.