Fig. 6.

Comparison of ex vivo OCT measurements on a human temporal bone specimen with hand-held OCT-scanner (a), (c) and fixed OCT-scanner (b), (d), showing the depth projections of OCT volume scans (a), (b) and the oscillation amplitude at the frequency of 1.500 Hz (c), (d). The $x$ and $y$ scales are applicable for the working distance of 8 mm. (e) The normalized oscillation amplitude is shown for exemplary points A, B, and C marked in (a) and (b). The points A and B correspond to positions on the pars tensa. In order to demonstrate the detection limit, point C was selected to be outside the tympanic membrane, where no sound-induced oscillation is expected. (f) Sound pressure level for the ex vivo measurements with hand-held and fixed OCT-scanner and for the in vivo measurement presented in Fig. 5.