Fig. 2.

(a) Photoacoustic (PA) axial and lateral resolution of the probe estimated in the depth range from 0.5 to 2.5 mm. (b) A 2D PA circumferential image of an absorbing circular line phantom, with the signal-to-noise ratio (SNR) at different angular positions indicated. (c) A 2D PA image of a coronary stent. All of the struts are visible; those in the ultrasonic shadow of the OCT catheter (arrows) have lower signal intensities. A micrograph (inset) of the stent shows the position of the imaging plane (red dashed line). Images (b) and (c) are displayed on linear scales.