Figure 4From: High-frequency ultrasound for intraoperative margin assessments in breast conservation surgery: a feasibility study Ultrasonic spectra from through-transmission (a) and pulse-echo (b) measurements of surgical tissue specimens. Amplitudes have been normalized and offset for comparison. Note the increase in spectral structure (peaks and valleys) from FA to normal to LCIS, representing an increase in the ultrasonic parameter peak density.Back to article page