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Representative longitudinal plane lesions: (a) in free field, (b) with the rib phantom at 8 cm, (c) with the rib phantom at 4 cm, and (d) with porcine ribs at 8 cm. The trailing paths created by the translation of marginal bubble nuclei were the cause of most of the collateral effects seen in the longitudinal plane. Ultrasound propagation: top to bottom.
