Fig. 5.

Reconstructed photoacoustic images using the point-target phantom. DAS, DMAS, and DS-DMAS were used for the first, second, and third columns of the images, respectively. All images are shown with a dynamic range of 60 dB. (a) 1 frame, (b) 3 frames, (c) 10 frames, (d) 20 frames, (e) 50 frames, and (f) 100 frames of the detected photoacoustic signals were used for averaging. The background noise is suppressed (darker background) using a higher number of frames. The dotted-square is used for CR calculation.