Fast Total Focusing Method Based On Elliptical Arc Scanning algorithm and OpenCL Acceleration

Total focusing method (TFM), as the most effective post-processing technique for ultrasonic phased array imaging currently, can achieve focusing at any point within the detection area, possessing advantages of high resolution and signal-to-noise ratio that traditional phased array imaging methods lack. However, Total Focusing Method (TFM) imaging requires delay-and-sum processing of full matrix capture (FMC) data. If the number of elements involved in signal acquisition is N, the full matrix data will contain N A-scan signals, each containing thousands of sampling points.This will result in long computation time and make it difficult to achieve real-time imaging. This paper proposes a fast total focusing method that combines elliptical arc scanning algorithm and OpenCL hardware acceleration, and deploys it to a self-developed ultrasound phased array imaging system. Results show that the fast total focusing method can generate a 512 × 512 pixel image with 32 elements in an average time of only 64 milliseconds, far surpassing the time required by conventional total focusing algorithms, providing a feasible approach for real-time high-precision non-destructive testing online.