Optical-resolution photoacoustic microscopy for in vivo imaging of single capillaries.

By K. Maslov, Hao F. Zhang, Song Hu, Lihong V. Wang. Optics Letters, 2008

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Going deeper than microscopy: the optical imaging frontier in biology (2010, methodology): “For example, fPAM demonstrated 5-μm lateral resolution within ∼1 MFP of mouse ear tissue when using a tightly focused laser beam for illuminatio”
Photoacoustic imaging in cancer detection, diagnosis, and treatment guidance (2011, background): “With a highly focused laser beam, a lateral resolution of 5 μm can be reached to image superficial capillaries [19].”
In Vivo Acoustic Super-Resolution and Super-Resolved Velocity Mapping Using Microbubbles (2015, background): “This technique, however, suffers from the inherent compromise between achievable spatial resolution and depth penetration, with estimated optimal resolutions for optical resolution PAM (OR-PAM) of 5 µm laterally and 15 µm axially, but with a limit of 0.7 mm penetration depth [24].”