Improved Spatiotemporal Resolution in Echocardiography Using Mixed Geometry Imaging Sequences

Herrema, Blake A.; Eshkalak, Nazli Javadi; Bottenus, Nick

doi:10.1109/tuffc.2024.3364051

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

2024

DOI: 10.1109/tuffc.2024.3364051

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Improved Spatiotemporal Resolution in Echocardiography Using Mixed Geometry Imaging Sequences

Blake A. Herrema,

Nazli Javadi Eshkalak,

Nick Bottenus

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2024

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Universal REFoCUS Beamforming With Spatial Weighting

Vrålstad,

Kvalevåg,

Rindal

et al. 2024

IEEE Open J. Ultrason., Ferroelect., Freq. Contr.

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REFoCUS (Retrospective Encoding For Conventional Ultrasound Sequences) offers great flexibility by enabling synthetic aperture beamforming from conventional ultrasound sequences. This flexibility is beneficial for many aspects in medical ultrasound beamforming, including e.g. combination of different transmit waves, distributed sound speed estimation and common-midpoint gathers. REFoCUS beamforming also has image quality comparable to state-of-art methods such as Retrospective Transmit Beamforming (RTB). However, the previously published implementations of REFoCUS do not address clutter from sidelobes and grating lobes present in the data before the recovery. This reduces image quality due to potentially strong sidelobes and grating lobes, particularly when using REFoCUS in combination with micro-beamforming and matrix array probes. Recordings from micro-beamforming probes may thus not be compliant with the existing REFoCUS methods. We propose to solve the sidelobes and grating lobe issues by introducing a reformulation of REFoCUS that performs multistatic data recovery and beamforming in the time domain, allowing spatial weighting to remove clutter and noise. Spatial weighting is based on common beamforming principles and incorporates element directivity, dynamic Fnumber, beam geometry weighting, and grating lobe suppression. We also discuss how aperture sampling affects beamforming with REFoCUS. Spatially Weighted REFoCUS (SWR) and critical sampling of the transmit aperture show suppression of receive grating lobes in an in vivo setting with two different microbeamforming matrix-array probes, leading to an increase in gCNR contrast from 0.44 to 0.96 in a fetal image and from 0.39 to 0.89 in a cardiac image.

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Universal REFoCUS Beamforming With Spatial Weighting

Vrålstad,

Kvalevåg,

Rindal

et al. 2024

IEEE Open J. Ultrason., Ferroelect., Freq. Contr.

View full text Add to dashboard Cite

show abstract

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Improved Spatiotemporal Resolution in Echocardiography Using Mixed Geometry Imaging Sequences

Cited by 1 publication

References 31 publications

Universal REFoCUS Beamforming With Spatial Weighting

Universal REFoCUS Beamforming With Spatial Weighting

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