Delay-and-Sum (DAS) beamformer is the most common beamforming algorithm in Photoacoustic imaging (PAI) due to its simple implementation and real time imaging. However, it provides poor resolution and high levels of sidelobe. A new algorithm named Delay-Multiply-and-Sum (DMAS) was introduced. Using DMAS leads to lower levels of sidelobe compared to DAS, but resolution is not satisfying yet. In this paper, a novel beamformer is introduced based on the combination of Minimum Variance (MV) adaptive beamforming and DMAS, so-called Minimum Variance-Based DMAS (MVB-DMAS). It is shown that expanding the DMAS equation leads to some terms which contain a DAS equation. It is proposed to use MV adaptive beamformer instead of existing DAS inside the DMAS algebra expansion. MVB-DMAS is evaluated numerically compared to DAS, DMAS and MV and Signal-to-noise ratio (SNR) metric is presented. It is shown that MVB-DMAS leads to higher image quality and SNR for about 13 dB, 3 dB and 2 dB in comparison with DAS, DMAS and MV, respectively.
@article{arxiv.1801.06421,
title = {Medical Photoacoustic Beamforming Using Minimum Variance-Based Delay Multiply and Sum},
author = {Moein Mozaffarzadeh and Ali Mahloojifar and Mahdi Orooji},
journal= {arXiv preprint arXiv:1801.06421},
year = {2018}
}
Comments
SPIE Digital Optical Technologies, 2017, Munich, Germany. arXiv admin note: substantial text overlap with arXiv:1709.07965