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SPA imaging of a NEB-GNS polyacrylamide inclusion located inside an agarose gel: (a) ultrasound image, (b) PA image, (c) SPA image and (d) SPA image overlaid on the US image. An 8-cycle US excitation at 3 MHz and focused to 60 mm was synchronized with lasing. The acoustic pressure measured at 35 mm is 1.6 MPa, and the laser fluence is 5.2 mJ/cm2.
