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Reconstructed images of horse-hair phantom using 2.25 MHz transducer: (a) Photograph of the horse-hair phantom glued on transparent plastic tubes, PAT images acquired using PLD-PAT (b-f) and OPO-PAT (g-m). All images have the same scale bar as shown in b. Scan time (full 360 degree rotation) for image acquisition was indicated on the top-right corner of the images. (n) line scan profiles along A and B, (o) signal-to-noise ratio (SNR) as a function of scan time.
