Article Dans Une Revue IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control Année : 2018

Color and Vector Flow Imaging in Parallel Ultrasound With Sub-Nyquist Sampling

Résumé

RF acquisition with a high-performance multichannel ultrasound system generates massive data sets in short periods of time, especially in "ultrafast" ultrasound when digital receive beamforming is required. Sampling at a rate four times the carrier frequency is the standard procedure since this rule complies with the Nyquist-Shannon sampling theorem and simplifies quadrature sampling. Bandpass sampling (or undersampling) outputs a bandpass signal at a rate lower than the maximal frequency without harmful aliasing. Advantages over Nyquist sampling are reduced storage volumes and data workflow, and simplified digital signal processing tasks. We used RF undersampling in color flow imaging (CFI) and vector flow imaging (VFI) to decrease data volume significantly (factor of 3 to 13 in our configurations). CFI and VFI with Nyquist and sub-Nyquist samplings were compared in vitro and in vivo. The estimate errors due to undersampling were small or marginal, which illustrates that Doppler and vector Doppler images can be correctly computed with a drastically reduced amount of RF samples. Undersampling can be a method of choice in CFI and VFI to avoid information overload and reduce data transfer and storage. Index Terms— Color Doppler, parallel ultrasound imaging, sub-Nyquist sampling, undersampling, vector Doppler, vector flow imaging (VFI).

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Dates et versions

hal-01826094 , version 1 (21-01-2019)

Identifiants

Citer

Craig Madiena, Julia Faurie, Jonathan Porée, Damien Garcia. Color and Vector Flow Imaging in Parallel Ultrasound With Sub-Nyquist Sampling. IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2018, 65 (5), pp.795 - 802. ⟨10.1109/TUFFC.2018.2817885⟩. ⟨hal-01826094⟩
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