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(a) The reconstructed PA image from channel data as a ground truth. (b-c) The reconstructed images through ultrasound and SPARE beamforming. Dynamic focusing is applied as ultrasound beamforming. Grating lobe artifacts are visible in the near field of ultrasound beamforming result (b) when a large aperture is used in 1st ultrasound beamforming, but it is drastically reduced when a small aperture size is used (c).
