Journal ArticleDOI
Coherent plane-wave compounding for very high frame rate ultrasonography and transient elastography
TLDR
It is proposed to improve the beamforming process by using a coherent recombination of compounded plane-wave transmissions to recover high-quality echographic images without degrading the high frame rate capabilities.Abstract:
The emergence of ultrafast frame rates in ultrasonic imaging has been recently made possible by the development of new imaging modalities such as transient elastography. Data acquisition rates reaching more than thousands of images per second enable the real-time visualization of shear mechanical waves propagating in biological tissues, which convey information about local viscoelastic properties of tissues. The first proposed approach for reaching such ultrafast frame rates consists of transmitting plane waves into the medium. However, because the beamforming process is then restricted to the receive mode, the echographic images obtained in the ultrafast mode suffer from a low quality in terms of resolution and contrast and affect the robustness of the transient elastography mode. It is here proposed to improve the beamforming process by using a coherent recombination of compounded plane-wave transmissions to recover high-quality echographic images without degrading the high frame rate capabilities. A theoretical model is derived for the comparison between the proposed method and the conventional B-mode imaging in terms of contrast, signal-to-noise ratio, and resolution. Our model predicts that a significantly smaller number of insonifications, 10 times lower, is sufficient to reach an image quality comparable to conventional B-mode. Theoretical predictions are confirmed by in vitro experiments performed in tissue-mimicking phantoms. Such results raise the appeal of coherent compounds for use with standard imaging modes such as B-mode or color flow. Moreover, in the context of transient elastography, ultrafast frame rates can be preserved while increasing the image quality compared with flat insonifications. Improvements on the transient elastography mode are presented and discussed.read more
Citations
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Journal ArticleDOI
Ultrafast imaging in biomedical ultrasound
Mickael Tanter,Mathias Fink +1 more
TL;DR: In this article, the basic principles and implementation of ultrafast imaging in biomedical ultrasound are illustrated and discussed in particular, present and future applications of ultra-fast imaging for screening, diagnosis, and therapeutic monitoring.
Journal ArticleDOI
Spatiotemporal Clutter Filtering of Ultrafast Ultrasound Data Highly Increases Doppler and fUltrasound Sensitivity
Charlie Demene,Thomas Deffieux,Mathieu Pernot,Bruno-Felix Osmanski,Valérie Biran,Jean-Luc Gennisson,Lim-Anna Sieu,Antoine Bergel,Stephanie Franqui,Jean-Michel Correas,Ivan Cohen,Olivier Baud,Mickael Tanter +12 more
TL;DR: The singular value decomposition (SVD) takes benefits of the different features of tissue and blood motion in terms of spatiotemporal coherence and strongly outperforms conventional clutter rejection filters based on high pass temporal filtering.
Journal ArticleDOI
Functional ultrasound imaging of the brain.
TL;DR: FUS identifies regions of brain activation and was used to image whisker-evoked cortical and thalamic responses and the propagation of epileptiform seizures in the rat brain.
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Ultrafast compound doppler imaging: providing full blood flow characterization
Jeremy Bercoff,Gabriel Montaldo,Thanasis Loupas,David Savery,Fabien Mézière,Mathias Fink,Mickael Tanter +6 more
TL;DR: This paper demonstrates that breakthrough performances in flow analysis can be reached using this concept of ultrafast compound Doppler, which allows faster acquisition frame rates for high-velocity flow imaging, or very high sensitivity for low-flow applications.
Journal ArticleDOI
An overview of elastography - an emerging branch of medical imaging.
Armen Sarvazyan,Timothy J. Hall,Matthew W. Urban,Mostafa Fatemi,Salavat R. Aglyamov,Brian S. Garra +5 more
TL;DR: This paper presents a classification of elasticity measurement and imaging techniques based on the methods used for generating a stress in the tissue, and measurement of the tissue response and presents various techniques of EI.
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