Fig. 3: 3D imaging algorithm. | Nature Communications

Fig. 3: 3D imaging algorithm.

From: A flexible optoacoustic blood ‘stethoscope’ for noninvasive multiparametric cardiovascular monitoring

Fig. 3

a Schematic illustration of ultrasound receiving paths in the traditional Delay-and-Sum (DAS) method. A correct path takes account of refraction at the layer interface, and the time flight becomes complicated to calculate. b Our method decomposes the wave components and separately extrapolates the wavefields in different layers for image reconstruction. c The phantom image for numerical simulation. d Image reconstructed by traditional DAS method. e Image reconstructed by our method. f The amplitudes profiles, along with Line-A data of the ground truth (green band) and the images reconstructed by the DAS (dash blue) and our methods (solid orange), respectively. With the full-width half maximum (−6 dB) used as the resolution metric, our method outperforms the DAS method by 308%. g Quantitative comparisons between the DAS and our method in terms of resolution, CNR, and GCNR. Source data are provided as a Source Data file.

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