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* Corresponding author 1 Institut Langevin ondes et images

Abstract : Conventional ultrasound Doppler techniques are based on focused beam to insonify the medium which leads to a tradeoff between the field of view and the resolution: a limited amount of 15 temporal points for 2D imaging mode or only one line for pulse wave mode. Recently, the introduction of ultrafast plane wave imaging has enabling acquisitions of hundreds of temporal samples over a large field of view. This huge amount of data can be used in different ways than in conventional Doppler modes to extract information about the flow. First, using properties of Doppler spectrum and calibrated data, we retrieve the out of plane speed vector component in transverse flow acquisitions, improving a previous technique called spectral broadening. An experimental demonstration is performed in vivo on a carotid artery. Secondly, we study how ultrafast plane wave acquisitions allows to withdraw the geometric broadening on Doppler spectrums to visualize only the speed and its gradient. This new technique becomes highly sensitive to the type of the flow profile and turbulences. A comparison between this technique and conventional pulse wave Doppler is performed in vivo on the carotid artery.

keyword : Ultrafast Imaging Ultrafast Doppler Spectral Broadening

Autor: Bruno-Félix Osmanski - Gabriel Montaldo Mickaël Tanter -

Fuente: https://hal.archives-ouvertes.fr/


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