Fig. 4: High-resolution 3D photoacoustic images of phantoms.
From: All-optical forward-viewing photoacoustic probe for high-resolution 3D endoscopy
a A bright-field microscope image (3 mm across) of a 100 µm diameter synthetic hair knot. b, c Reconstructed photoacoustic images of the synthetic hair knot shown as x–y and y–z MIPs, respectively. d A bright-field microscope image of a leaf skeleton phantom, e, f Reconstructed photoacoustic images of the leaf phantom shown as x–y and y–z MIPs, respectively. g Reconstructed photoacoustic images of the leaf phantom for four detection aperture diameters: 2.5, 2, 1.5, and 1 mm. h Profiles of a feature (indicated by horizontal red dotted lines) from the leaf phantom images in g for each detection aperture. i A plot of the lateral spatial resolution (evaluated by taking the FWHM width of a Gaussian function that is fitted to the profiles in h) as a function of the detection aperture. Incident fluence: 18 mJ/cm2
