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. 2013 Jun 12;21(12):14636–14642. doi: 10.1364/OE.21.014636

Fig. 2.

Fig. 2

Beam sequences for the co-registered imaging. From the top row, trigger signals for transmitting ultrasound and laser and receiving echo signals for analog to digital converter are shown. In the last row, the alternating photoacoustic (PX) and ultrasound transmits (UX) are depicted.