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Reconstruction based photoacoustic tomography (PAT) for two dimensional phantoms has been reported. Reconstruction algorithms namely, time reversal, back projection and interpolated time reversal have been examined. The phantoms include single disc (circular region with constant optical absorption coefficient), multiple discs (three discs with different optical absorption coefficients) and vasculature (two superimposed vasculatures with dissimilar optical absorption properties) phantoms. The simulations were performed using k-Wave toolbox. The photoacoustic waves were recorded by 100 point sensors placed in a circular manner at a distance. It was found that Pearson’s coefficient of the reconstructed images for the phantoms for those algorithms were 0.92, 0.94, 0.99; 0.80, 0.88, 0.99 and 0.56, 0.66, 0.89, respectively. The execution time for the first and the third methods were 2x and 3x times with respect to the second algorithm, respectively. The results show that the third algorithm although takes longer time to execute but provides better reconstruction compared to the other procedures.
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