Efficient Strategies for Estimating the Spatial
Coherence of Backscatter
Various properties of an ultrasound echo can be analyzed to characterize its source. The magnitude of the echo is the most commonly used property, but is susceptible to image degradation via noise sources such as reverberation clutter and phase aberration. Recent studies suggest that the spatial coherence of the echo, a measure of the similarity at different points along the wavefront, is a more robust echo property in noisy imaging environments. In particular, short-lag spatial coherence (SLSC) beamforming has demonstrated improvements in image quality in cardiac, liver, and fetal imaging clinical studies. However, the computational cost of spatial coherence estimation is a significant hurdle to its application in the clinic.
In this work, we propose several efficient strategies for spatial coherence estimation based on the statistical properties of ultrasound backscatter. Using these techniques, SLSC images of similar quality can be formed with a 95% reduction in computation time.
D. Hyun; A. L. C. Crowley; J. J. Dahl, "Efficient Strategies for Estimating the Spatial Coherence of Backscatter," in IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control , vol.PP, no.99, pp.1-1 doi: 10.1109/TUFFC.2016.2634004