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Comparison of travel time (top row) and waveform (bottom row) reconstruction methods using older ultrasound tomography unit. Gray scale values in the sound speed images correspond to a range of 1400–1575 m/s. Brighter areas correspond to higher sound speed. (a) Complex parenchyma shape. (b) 1.5 cm tumor. (c) 4 cm tumor (1 o’clock) and parenchyma (9 o’clock).
