[Measuring vibrations by laser doppler vibrometry of the human tympanic membrane after stapes fixation]. / Laserdopplervibrometrische Schwingungsmessungen am menschlichen Trommelfell nach Stapesfixierung.

At times preoperative diagnosis of otosclerosis can prove difficult. Even the objective measurement of the stapes reflex is not very conclusive in patients suffering from more severe hearing loss. Laser-Doppler vibrometry measures the velocity or amplitude of the tympanic membrane (umbo) vibrations. Laser-Doppler vibrometry has a sensitivity that is highly by the factor 10(4) than tympanometry. The herewith presented examinations show, that there is a correlation between the frequency patterns of the displacement amplitudes and experimentally simulated otosclerosis.