Applied Sciences, Vol. 15, Pages 4877: Combining Windowed Enveloping and the Delay and Sum Algorithm for Photoacoustic Image Reconstruction

Applied Sciences doi: 10.3390/app15094877

Authors:
Mengyu Fang
Xili Jing
Shan Gao
Jingru Zhao
Tianrun Zhang

Delay and sum (DAS) is one of the most common beamforming algorithms for photoacoustic image reconstruction. Owing to its high computational efficiency and ease of implementation, this method is particularly well-suited for real-time photoacoustic imaging. However, its shortcomings, such as that the algorithm can make high sidelobes and strong artifacts, are as prominent as its advantages. Some improved algorithms based on spatial coherence theory, such as DMAS, have significantly enhanced imaging quality. In this paper, we analyzed the beamforming principle and propose a photoacoustic imaging method by combining windowed enveloping and the delay and sum beamforming algorithm. The delay and sum beamforming algorithm is used for ensuring high computational efficiency, and windowed enveloping for the suppression of sidelobes and artifacts. Tests were performed for a simple circular source model and a multiple-source model. The results show that our method can effectively improve the quality of reconstructed images compared with DAS and some improved methods. In addition, this method also retains the advantage of the high parallelism of the DAS algorithm and is suitable for real-time imaging systems.

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