Real-Time Assessment of Myocardial Contractility Using Shear Wave Imaging

Pernot, Mathieu; Couade, Mathieu; Matéo, Philippe; Crozatier, Bertrand; Fischmeister, Rodolphe; Tanter, Mickaël

doi:10.1016/j.jacc.2011.02.042

Cited by 134 publications

(126 citation statements)

References 19 publications

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“…Typical frame rates in two-dimensional echocardiography are 30-100 frames/s, which allows visualizing the heart motion and quantifying myocardial velocities and strains during the cardiac cycle [1], [2]. However, such frame rates are insufficient to track mechanical waves such as remotely induced shear waves [3], [4], [5] intrinsic shear waves [6] or electromechanical waves [7], [8] because of their high propagation speed in the myocardium (between 1 and 10 m/s).…”

Section: Introductionmentioning

confidence: 99%

“…The concept of ultrafast imaging using non-focused transmit waves [11], [12], [13], [14] has been proposed to drastically reduce the number of transmits keeping the number of scan lines and the image size. Plane waves transmitted by linear transducer arrays have been successfully implemented on commercial scanners to image the propagation of remotely induced shear waves at frame rates up to 10,000 images/seconds in many organs of human patients including the breast [15], the liver [16], the carotid artery [17], the cornea [18] and in the heart [3], [19], where it provides a non-invasive way to access the myocardial contractility [5]. Moreover, successive plane waves acquisitions performed with tilted plane waves can be combined either incoherently to improve transverse motion estimates [20] or coherently to increase the poor image quality obtained by using only one plane wave in terms of contrast and resolution.…”

Section: Introductionmentioning

confidence: 99%

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High-contrast ultrafast imaging of the heart

Papadacci

Pernot

Couade

et al. 2014

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

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217

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Non-invasive ultrafast imaging for human cardiac applications is a big challenge to image intrinsic waves such as electromechanical waves or remotely induced shear waves in elastography imaging techniques. In this paper we propose to perform ultrafast imaging of the heart with adapted sector size by using diverging waves emitted from a classical transthoracic cardiac phased array probe. As in ultrafast imaging with plane wave coherent compounding, diverging waves can be summed coherently to obtain high-quality images of the entire heart at high frame rate in a full field-ofview. To image shear waves propagation at high SNR, the field-of-view can be adapted by changing the angular aperture of the transmitted wave. Backscattered echoes from successive circular wave acquisitions are coherently summed at every location in the image to improve the image quality while maintaining very high frame rates. The transmitted diverging waves, angular apertures and subapertures size are tested in simulation and ultrafast coherent compounding is implemented on a commercial scanner. The improvement of the imaging quality is quantified in phantom and in vivo on human heart. Imaging shear wave propagation at 2500 frame/s using 5 diverging waves provides a strong increase of the Signal to noise ratio of the tissue velocity estimates while maintaining a high frame rate. Finally, ultrafast imaging with a 1 to 5 diverging waves is used to image the human heart at a frame rate of 900 frames/s over an entire cardiac cycle. Thanks to spatial coherent compounding, a strong improvement of imaging quality is obtained with a small number of transmitted diverging waves and a high frame rate, which allows imaging the propagation of electromechanical and shear waves with good image quality.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-contrast ultrafast imaging of the heart

Papadacci

Pernot

Couade

et al. 2014

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

Self Cite

217

167

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“…SSI could be positioned to quantify in real time the change in stiffness of the myometrial muscle during labour and to identify the origin of the contraction within the uterus. Indeed, the technique has already been proven to be efficient to follow muscle and heart contractions [13,14,27] and the ultrafast imaging and processing system makes it an ideal tool to assess the rapid elasticity changes that occurs during muscle contraction. In this paper, we report on the feasibility and clinical interest of the SSI technique in the quantitative assessment of uterine contractions during labour.…”

Section: Introductionmentioning

confidence: 99%

Quantification of elasticity changes in the myometrium during labor using Supersonic Shear Imaging: A feasibility study

et al. 2015

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“…More direct tissue characterization methods have been developed as well, typically referred to as elastography, and applied for the assessment of soft, bulky tissues like the liver [21,22], breast [23], prostate [24], skeletal muscles [25], kidneys [26], and heart [27,28]. These elasticity imaging techniques rely on the application of a force to an area of interest in the tissue and measure tissue's mechanical response.…”

Section: Introductionmentioning

confidence: 99%

Supersonic Shear Wave Imaging to Assess Arterial Nonlinear Behavior and Anisotropy: Proof of Principle via Ex Vivo Testing of the Horse Aorta

Shcherbakova

Papadacci

Swillens

et al. 2014

Advances in Mechanical Engineering

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Supersonic shear wave imaging (SSI) is a noninvasive, ultrasound-based technique to quantify the mechanical properties of bulk tissues by measuring the propagation speed of shear waves (SW) induced in the tissue with an ultrasound transducer. The technique has been successfully validated in liver and breast (tumor) diagnostics and is potentially useful for the assessment of the stiffness of arteries. However, SW propagation in arteries is subjected to different wave phenomena potentially affecting the measurement accuracy. Therefore, we assessed SSI in a less complex ex vivo setup, that is, a thick-walled and rectangular slab of an excised equine aorta. Dynamic uniaxial mechanical testing was performed during the SSI measurements, to dispose of a reference material assessment. An ultrasound probe was fixed in an angle position controller with respect to the tissue to investigate the effect of arterial anisotropy on SSI results. Results indicated that SSI was able to pick up stretch-induced stiffening of the aorta. SW velocities were significantly higher along the specimen's circumferential direction than in the axial direction, consistent with the circumferential orientation of collagen fibers. Hence, we established a first step in studying SW propagation in anisotropic tissues to gain more insight into the feasibility of SSI-based measurements in arteries.

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Real-Time Assessment of Myocardial Contractility Using Shear Wave Imaging

Abstract: Myocardial stiffness can be measured in real time over the cardiac cycle using SWI, which allows quantification of stiffness variation between systole and diastole. Systolic myocardial stiffness provides a noninvasive index of myocardial contractility.

Cited by 134 publications

References 19 publications

High-contrast ultrafast imaging of the heart

High-contrast ultrafast imaging of the heart

Quantification of elasticity changes in the myometrium during labor using Supersonic Shear Imaging: A feasibility study

Supersonic Shear Wave Imaging to Assess Arterial Nonlinear Behavior and Anisotropy: Proof of Principle via Ex Vivo Testing of the Horse Aorta

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