Research on Forward Compensation Algorithm of Water-immersed Total Focusing Ultrasound Imaging

摘要

To overcome the problem of long imaging time caused by the calculation of the refraction point in the double-layer medium ultrasonic imaging, the algorithm in this paper based on the radial calculation of the ultrasonic array element and the radiation arc spline compensation is adopted. And the water-immersed ultrasound total focusing phased-array imaging is discussed. First, according to the half-power beam angle corresponding to the ultrasonic transducer array element, the dividing line of the refraction point is divided, and then Bresenham's line scanning technology is used to determine all the pixels on the refraction line, and further the delay rule is adopted to determine the pixel point in the transmission process, and finally the reconstructed image is generated. This method not only avoids the large amount of time it takes to iteratively solve the refraction point, but also applies it to the full capture technique and the total focusing imaging, which can save the calculating time of the refraction point to the utmost, thus effectively improving the detection efficiency and imaging quality. Through experimental verification, the efficiency of this method is improved by two orders of magnitude compared to the reverse iteration method in 64-element immersed ultrasound total focusing imaging, and the imaging quality is improved slightly.