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19 February 2018 Development and validation of a short-lag spatial coherence theory for photoacoustic imaging
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We previously derived spatial coherence theory to be implemented for studying theoretical properties of ShortLag Spatial Coherence (SLSC) beamforming applied to photoacoustic images. In this paper, our newly derived theoretical equation is evaluated to generate SLSC images of a point target and a 1.2 mm diameter target and corresponding lateral profiles. We compared SLSC images simulated solely based on our theory to SLSC images created after beamforming acoustic channel data from k-Wave simulations of 1.2 mm-diameter disc target. This process was repeated for a point target and the full width at half the maximum signal amplitudes were measured to estimate the resolution of each imaging system. Resolution as a function of lag was comparable for the first 10% of the receive aperture (i.e., the short-lag region), after which resolution measurements diverged by a maximum of 1 mm between the two types of simulated images. These results indicate the potential for both simulation methods to be utilized as independent resources to study coherence-based photoacoustic beamformers when imaging point-like targets.
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Michelle T. Graham and Muyinatu A. Lediju Bell "Development and validation of a short-lag spatial coherence theory for photoacoustic imaging", Proc. SPIE 10494, Photons Plus Ultrasound: Imaging and Sensing 2018, 104945K (19 February 2018); doi: 10.1117/12.2291237;

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