TY - RPRT TI - Correction of ultrasonic wavefront distortion using backpropagation and a reference waveform method for time-shift compensation. AU - D L Liu AU - R C Waag PY - 1994 DO - 10.1121/1.410304 UR - https://pubmed.ncbi.nlm.nih.gov/7930065/ ID - 7930065 ER -