A method and system are provided for delivering personalized messages to a calling party who calls a called party who is engaged in an Internet session over a telephone line not capable of receiving telephone calls without interrupting the Internet connection. A 3D reconstruction image of the examination region is generated using a preoperatively recorded 3D image dataset of the examination region. This generalized multi-port feedback circuit receives an amplified high-frequency signal and eliminates the reverse admittance of the amplified high-frequency signal to let the admittance value of the output amplified high-frequency signal approach zero so as to be unilateral. Some methods of the present invention are implemented in part by controlling a gateway of the home network.