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(a) Photograph of the LED-based PA and US imaging system—AcousticX; (b) US (gray colormap), PA (hot colormap), and US/PA overlay cross-section images of a human volunteer’s wrist acquired at a frame rate of 10 Hz. Blood vessels are marked using blue arrows in the PA image. Adapted with permission from W. Xia, M. Kuniyil Ajith Singh, E. Maneas, N. Sato, and A. E. Desjardins, Sensors, Vol.18, Article ID1394, licensed under a Creative Commons Attribution (CC BY) license.
