Fig. 8.
Photoacoustic imaging of the coloured ink vessel phantom with four inclusions: green (top left), blue (top right), violet (bottom left), and red (bottom right). The photoacoustic images, displayed as maximum intensity projections across a depth of 0.2 mm, were obtained with excitation wavelengths of 550, 630, 725, 800 and 1210 nm. A colour photograph of the phantom is also shown. The field of view is 20 × 20 mm.