Fig. 4.

In vivo arm and palm imaging of healthy human volunteers. (a) Photograph of human arm (red box indicates the imaged region). Subject: male, 25 years old. (b) Depth-encoded maximum amplitude projection (MAP) photoacoustic image of the human arm (Visualization 4 ^{(878.7KB, MOV)} ). x, y and z correspond to axial, lateral and elevation directions of the transducer array, respectively. MAP was performed along the axial direction. (c) Photograph of human palm (red box indicates the imaging region). Subject: male, 23 years old. (d) Depth-encoded MAP photoacoustic image of human palm (Visualization 5 ^{(814.9KB, MOV)} ), MAP was performed along the axial direction of transducer array