Ultrafast compound doppler imaging: providing full blood flow characterization

Bercoff, Jérémy; Montaldo, Gabriel; Loupas, T.; Savery, David; Mézière, Fabien; Fink, Mathias; Tanter, Mickaël

doi:10.1109/tuffc.2011.1780

Cited by 415 publications

(241 citation statements)

References 19 publications

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“…Written consent was obtained from the parents of all subjects prior to enrollment. Eligible neonates between 26 0/7 wk and 31 Articles 6/7 wk gestation admitted to the neonatal intensive care unit at the University of Washington Medical Center were enrolled within the first 48 h of life as part of a pilot study to assess the feasibility and reliability of cerebral perfusion measures obtained by fast Doppler (23). Infants with intrauterine growth restriction have been found to have significantly altered cerebral perfusion measures (24,25), so growth restricted infants were excluded from this study.…”

Section: Participantsmentioning

confidence: 99%

Fast Doppler as a novel bedside measure of cerebral perfusion in preterm infants

et al. 2015

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Background: Altered cerebral perfusion from impaired autoregulation may contribute to the morbidity and mortality associated with premature birth. We hypothesized that fast Doppler imaging could provide a reproducible bedside estimation of cerebral perfusion and autoregulation in preterm infants. Methods: This is a prospective pilot study using fast Doppler ultrasound to assess blood flow velocity in the basal ganglia of 19 subjects born at 26-32 wk gestation. Intraclass correlation provided a measure of test-retest reliability, and linear regression of cerebral blood flow velocity and heart rate or blood pressure allowed for estimations of autoregulatory ability. results: The intraclass correlation when imaging in the first 48 h of life was 0.634. We found significant and independent correlations between the systolic blood flow velocity and both systolic blood pressure and heart rate (P = 0.015 and 0.012 respectively) only in the 26-28 wk gestational age infants in the first 48 h of life. conclusion: Our results suggest that fast Doppler provides reliable bedside measurements of cerebral blood flow velocity at the tissue level in premature infants, acting as a proxy for cerebral tissue perfusion. Additionally, autoregulation appears to be impaired in the extremely preterm infants, even within a normal range of blood pressures.

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Section: Participantsmentioning

confidence: 99%

Fast Doppler as a novel bedside measure of cerebral perfusion in preterm infants

et al. 2015

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“…After the development of shear wave elastography by Tanter, et al [11], which was the first practical application of high-frame-rate ultrasound, various studies have been conducted for cardiovascular applications, such as vascular strain and blood flow imaging [12][13][14], pulse wave imaging [15,16], and cardiac strain and blood flow imaging [17][18][19][20][21]. In addition, various studies for improvement of the image quality in high-frame-rate ultrasound have been conducted [22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Phase-Sensitive 2D Motion Estimators Using Frequency Spectra of Ultrasonic Echoes

Hasegawa

2016

Applied Sciences

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Abstract:Recently, high-frame-rate ultrasound has been extensively studied for measurement of tissue dynamics, such as pulsations of the carotid artery and heart. Motion estimators are very important for such measurements of tissue dynamics. In high-frame-rate ultrasound, the tissue displacement between frames becomes very small owing to the high temporal resolution. Under such conditions, the speckle tracking method requires high levels of interpolation to estimate such a small displacement. A phase-sensitive motion estimator is feasible because it does not suffer from the aliasing effect by such a small displacement and does not require interpolation to estimate a sub-sample displacement. In the present study, two phase-sensitive 2D motion estimators, namely, paired 1D motion estimators and 2D motion estimator with shifted cross spectra, were developed. Phase-sensitive motion estimators using frequency spectra of ultrasonic echoes have already been proposed in previous studies. However, such methods had not taken into account the ambiguity of the frequency of each component of the spectrum. We have proposed a method, which estimates the mean frequency of each component of the spectrum, and the proposed method was validated by a phantom experiment. The experimental results showed that the bias errors in the estimated motion velocities of the phantom were less than or equal to (11.5% in lateral, 2.0% in axial) by the proposed 1D paired motion estimators and (3.0%, 2.0%) by the proposed 2D motion estimators, both of which were significantly smaller than (14.0%, 3.0%) of the conventional phase-sensitive 2D motion estimator.

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“…Recent studies indicate the growing emergence of ultrasound plane wave imaging (PWI). This technique has proven itself as a reliable method in several original and promising applications such as transient elastography, ultrafast Doppler imaging, ultrafast vector flow mapping, electromechanical wave imaging and functional brain imaging [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Stolt's f-k migration for plane wave ultrasound imaging

Garcia¹,

Tarnec²,

Muth³

et al. 2013

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

220

165

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Ultrafast ultrasound is an emerging modality that offers new perspectives and opportunities in medical imaging. Plane wave imaging (PWI) allows one to attain very high frame rates by transmission of planar ultrasound wavefronts. As a plane wave reaches a given scatterer, the latter becomes a secondary source emitting upward spherical waves and creating a diffraction hyperbola in the received RF (radio-frequency) signals. To produce an image of the scatterers, all the hyperbolas must be migrated back to their apexes. In order to perform beamforming of plane wave echo RFs and return high-quality images at high frame rates, we propose a new migration method carried out in the frequency-wavenumber (f-k) domain.The f-k migration for PWI has been adapted from the Stolt migration for seismic imaging. This migration technique is based on the exploding reflector model (ERM), which consists in assuming that all the scatterers explode in concert and become acoustic sources. The classical ERM model, however, is not appropriate for PWI. We showed that the ERM can be made suitable for PWI by a spatial transformation of the hyperbolic traces present in the RF data. In vitro experiments were performed to sketch the advantages of PWI with Stolt's f-k migration over the conventional delayand-sum (DAS) approach. The Stolt's f-k migration was also compared with the Fourier-based method developed by J-Y Lu.Our findings show that multi-angle compounded f-k migrated images are of quality similar to those obtained with a state-of-the-art dynamic focusing mode. This remained true even with a very small number of steering angles thus ensuring a highly competitive frame rate. In addition, the new FFT-based f-k migration provides comparable or better contrast-to-noise ratio and lateral resolution than the Lu's and DAS migration schemes. Matlab codes of the Stolt's f-k migration for PWI are provided.

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Ultrafast compound doppler imaging: providing full blood flow characterization

Cited by 415 publications

References 19 publications

Fast Doppler as a novel bedside measure of cerebral perfusion in preterm infants

Fast Doppler as a novel bedside measure of cerebral perfusion in preterm infants

Phase-Sensitive 2D Motion Estimators Using Frequency Spectra of Ultrasonic Echoes

Stolt's f-k migration for plane wave ultrasound imaging

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