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Sensitivity for detecting the AE signal through the skull. Measured transmit (TX) US pulse waveform (A) and corresponding spectrum (B) in water. (C) Sensitivity plot of peak AE signal through 8 mm of thick skull vs. injected current of monopole located at a depth of 40 mm below the top of the skullcap. At 1 MPa peak focal pressure, the noise equivalent current (i.e. where the signal equals mean of noise) was 360 ยตA through the skullcap.
