Implementation of total focusing method for phased array ultrasonic imaging on FPGA

This paper describes a multi-FPGA imaging system dedicated for the real-time imaging using the Total Focusing Method(TFM) and Full Matrix Capture(FMC). The system was entirely described using Verilog HDL language and implemented on Altera Stratix IV GX FPGA development board. The whole algorithm process is: to establish a coordinate system of image and divide it into grids, calculate the complete acoustic distance of array element between transmitting array element and receiving array element and transform it into index value, then index the sound pressure values from ROM and superimpose sound pressure values to get pixel value of one focus point, calculate the pixel values of all focus point to get the final imaging. The imaging result shows that this algorithm has high SNR of defect imaging And FPGA with parallel processing capability can provide high speed performance, so this system can provide the imaging interface, with complete function and good performance.