||Nadezhda has recently become a PhD student at the Center for Image Analysis, Division of Visual
Information and Interaction. During the seminar she is going to present her thesis work performed at the
Department of Cardiovascular Sciences, KU Leuven, Belgium. The topic of the study is coherence-based
beamforming for B-mode and speckle tracking echocardiography. Phase coherence methods have been
proposed to improve the delay-and-sum (DAS) beamforming in terms of contrast and spatial resolution.
However, they could be equally beneficial for speckle tracking echocardiography, given the higher
variance they introduce in the speckle texture. The aim of this study was to compare, in a close-to-clinical
scenario, the B-mode and speckle tracking performance of the DAS beamformer and 4 phase coherence
methods: generalized coherence factor, phase coherence factor, sign coherence factor and short lag spatial
coherence. Both simulation and experimental imaging of a tissue mimicking phantom were used to assess
classical imaging metrics, whereas in-vivo imaging was performed to evaluate myocardial visibility and
tissue tracking. Results showed improved resolution and contrast from the coherence beamformers, as
well as a reduction of clutter noise, especially in the near field. Similarly, apical strain curves were more
reliably estimated following coherence processing. Overall, these methods seem to better derive both
morphological and functional imaging, although no method outperformed in all scenarios.