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Left: Sensitivity fall-off based on different reconstruction methods. LI, Linear interpolation; CSI, cubic spline interpolation; NDFT, non-unifrom discrete Fourier transform; NFFT, non-uniform fast Fourier transform. Right: Typical axial reflectivity profile with a single partial reflector showing shoulder artifacts of linear and cubic spline interpolation. The data for NDFT and NFFT overlaps each other, showing the accuracy of the approximation.
