Figure 4: Display of the real-time feedback for ossiculoplasty. a schematic measurement setup; b magnet (*) on the umbo/eardrum; c surgeon with earphones; d improved middle ear transfer function by acoustic feedback. Via the coil that is placed under the patient’s head the magnet is set in vibration on the umbo/eardrum after performed ossiculoplasty. This is transmitted on the stapes and registered on the footplate by means of laser-Doppler-vibrometer (LDV). As stimulation signal of the coil, music can be played that is forwarded via the ossicular reconstruction to the footplate and registered by the surgeon via earphones. In real-time, changes of the prosthesis position and coupling can be “heard” and an optimal reconstruction result can be achieved [80].