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In ultrasound dynamic receive beamforming, focusing delays need to be updated for individual focal points, leading to increased hardware complexity. Proposed is a new efficient delay calculation method based on time-sharing bilinear delay interpolation (TS-BDI) to reduce both hardware complexity and focusing delay errors for portable ultrasound systems. The TS-BDI provides 2.5 dB improvement in the signal-to-noise ratio compared to the TS-LDI (linear delay interpolation). In addition, the proposed TS-BDI lowers the hardware complexity in the 64-channel digital dynamic receive beamformer compared to the conventional method, i.e. 36.0 reduction in equivalent gate counts. These results indicate that the proposed TS-BDI method could provide better accuracy in focusing delay calculation with reduced hardware complexity for portable ultrasound systems.
Date of Publication: January 2011