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(Color online) (a)–(d) Speed images from upper left clockwise: showing levels successively 3 mm higher in the breast. The position of the adenocarcinoma was confirmed from mammograms in the 7 o’clock position. The speed of the cancer was determined to average 1.597 mm/μms. The attenuation for this very small area was measured (using threshold based segmentation) at 2.76 dB/cm/MHz at 1.8 MHz.
