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a A PA/US imaging system for peripheral small-vessel imaging. (i) A photograph of the system. (ii) A photograph of a handheld type PA probe. (iii) A photography of a linear stage scanner for 3D image acquisition. b PA images of a diabetic foot patient and a healthy volunteer. c Overlaid PA–US Doppler and PA MAP images and a photograph of a human finger. All images were reproduced with permission from Ref. [30]. PA photoacoustic, US ultrasound, MAP maximum amplitude projection
