FIGURE 2 (a-e): Ultrasound images of the cross-section of thin wire phantoms in longitudinal (a), and transverse mode (b, c), graphite inclusion with 0.025% graphite and 0.01% TiO2. The base of the phantoms has 8% gelatin. (f-j) Corresponding photoacoustic images of obtained with the Acoustic X system with LED illumination. The PRF was 4 kHz, and 128 frames were averaged. (k-o): These PA images were captured at the PRF of 4kHz with 25,600 frames averaged at the same cross-section as that of (a-e). (p-t): Images predicted by the U-Net deep learning technique where the SNR is improved compared to the corresponding low number of frame averaged image.