Parametrization of mean insertion phantom.

The parameters AST (basal ST diameter, measured from the center of the round window through the modiolus to the opposite wall of the ST) and BST (basal turn width of the ST orthogonal to AST) describe the dimensions of the basal turn of the mean ST. HST (distance from the lowest to the highest point f the ST lumen along z) describes its overall height and HS, ST the height of its lateral wall (LW) spiral [49]. The Cochlear duct lengths CDLLW,ST and CDLST are measured along the LW of the phantom from the center of the round window to the most apical point and express the corresponding length as metric and angular length respectively [55]. The parameter “Area cochleostomy” describes the surface area of the basal ST phantom opening for CI array insertion.