A medical device comprising a corewire, sensor core, and coupler is presented. Said pre-distortion operation is chosen to correspond to an inverse of a distortion operation of a display process to be used for displaying said secondary image data to therefore compensate an non-uniformity of said image generation process with respect to image data without pre-distortion. The mapping may facilitate graphical identifications between parts of one entity that maps to part of another entity. Fractal image selection data is received from the client, and the system uses the received fractal image selection data to determine a fractal image selected by the user from the plurality of fractal images. 1 for PSTN and ISDN BRI or DSS1 for ISDN PRI.