Depth-dependent apodization window based on Chebyshev polynomial for ultrasound imaging

To improve the image resolution of a portable real-time ultrasound imaging device, this paper proposes a beamformer with composite apodization windows based on Chebyshev polynomial. By introducing the Chebyshev window, the level of sidelobe can be flexibly controlled. The value of weighting changes according to the detection depth and ultrasound attenuation such that it can attain better image resolution than traditional beamformers. The simulations and experiments indicate that the proposed method can flexibly narrow the mainlobe width while keeping the performance of the suppressing artifacts. The full width at half-maximum of this method is 14.1%-27.8% and 4.2%-25.0% narrower than those of traditional apodization methods in the field II simulations and Geabr_0 experiment, respectively.