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(a) Schematic illustration of the breast-holding structure. (b) Schematic illustration of breast-holding direction: (i) cranio-caudal (CC) of left breast, (ii) medio-lateral-oblique (MLO) of left breast, (iii) CC of right breast, and (iv) MLO of right breast. (c) Lesion images of a breast in (i) ultrasound and (ii) photoacoustic modes.
