Delay-and-sum-to-delay-standard-deviation-factor: a promising adaptive beamformer for cost-effective linear-array photoacoustic imaging

Posted on 13.09.2021 - 17:08
A new adaptive weighting method (delay-and-sum-to-delay-standard-deviation-factor (DASDSF)) combined with minimum variance (MV) beamforming is introduced in photoacoustic imaging (PAI). ExistingMV-based beamformers improve PA-image quality in terms of achieving narrow main-lobes and thus, improving spatial resolution. But, the beamformers give a strongside-lobe signal strength that greatly degrades the re-constructed image contrast. As a feedback weighting facto, DASDSF addresses the persisting side-lobe is-sue present in MV-beamformed images, i.e., our pro-posed method is robust against reduction in noises as well as side-lobes, and it outperforms MV and MV combined with coherence factor (CF) beamformers. Validation studies−being carried out both in numerical simulation and experiments employing low-cost(16-elements) linear transducer array in a home-builtPAI system−demonstrate an excellent performance of the proposed weighting approach in improving SNR, meanwhile, reducing main-lobe width (i.e.,FWHM),and side-lobe signal strength. The study demonstrates that the proposed algorithm holds promise for development of cost-effective PAI system using a low cost linear transducer (∼16 elements against∼128 generally used).

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Paul, Souradip; Thomas, Anjali; Singh, Mayanglambam (2021): Delay-and-sum-to-delay-standard-deviation-factor: a promising adaptive beamformer for cost-effective linear-array photoacoustic imaging. The Optical Society. Collection. https://doi.org/10.6084/m9.figshare.c.5578053.v2
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