A 3 MHz two dimensional array based on piezocomposite for medical imaging

“…40 A weakly focused ultrasound field is emitted and the RF signals from all 1024 elements are stored in memory and then beamformed off-line. 38 Data has been acquired from stationary parabolic flow in a flow rig, and the resulting profiles are shown in Fig.…”

Section: Three-dimensional Vector Velocity Imagingmentioning

confidence: 99%

New developments in vector velocity imaging using the transverse oscillation approach

et al. 2013

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Vector velocity imaging using the Transverse Oscillation (TO) approach has recently been FDA approved for linear array transducers on a commercial platform. It can now be used clinically for studying the complex flow at e.g. bifurcations, valves, and the heart in real time. Several clinical examples from venous flow to rotational flow in the heart will be shown. The technique is also being further developed and adapted for convex and phased array probes, for spectral velocity estimation, pressure estimation, and for three dimensional velocity tensor imaging. It is shown how the methods are optimized using Field II simulations along with several examples of their performance.

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“…A 3.5 MHz 32x32 element 2D matrix array transducer (Vermont S.A., Tours, France) with a pitch of 0.3 mm is employed. 21 At a sampling frequency of 70 MHz, data from all the 1024 active elements are acquired simultaneously through the 1024 channels on the synthetic aperture real-time ultrasound system SARUS, 22 and are stored for offline processing. Velocities are measured in a flow-rig system as illustrated in Fig.…”

Section: Measurement Equipmentmentioning

confidence: 99%

Preliminary examples of 3D vector flow imaging

et al. 2013

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This paper presents 3D vector flow images obtained using the 3D Transverse Oscillation (TO) method. The method employs a 2D transducer and estimates the three velocity components simultaneously, which is important for visualizing complex flow patterns. Data are acquired using the experimental ultrasound scanner SARUS on a flow rig system with steady flow. The vessel of the flow-rig is centered at a depth of 30 mm, and the flow has an expected 2D circular-symmetric parabolic profile with a peak velocity of 1 m/s. Ten frames of 3D vector flow images are acquired in a cross-sectional plane orthogonal to the center axis of the vessel, which coincides with the y-axis and the flow direction. Hence, only out-of-plane motion is expected. This motion cannot be measured by typical commercial scanners employing 1D arrays. Each frame consists of 16 flow lines steered from -15 to 15 degrees in steps of 2 degrees in the ZX-plane. For the center line, 3200 M-mode lines are acquired yielding 100 velocity profiles. At the center of the vessel, the mean and standard deviation of the estimated velocity vectors are (v x , v y , v z ) = (-0.026, 95, 1.0)±(8.8, 6.2, 0.84) cm/s compared to the expected (0.0, 96, 0.0) cm/s. Relative to the velocity magnitude this yields standard deviations of (9.1, 6.4, 0.88) %, respectively. Volumetric flow rates were estimated for all ten frames yielding 57.9±2.0 mL/s in comparison with 56.2 mL/s measured by a commercial magnetic flow meter. One frame of the obtained 3D vector flow data is presented and visualized using three alternative approaches. Practically no in-plane motion (v x and v z ) is measured, whereas the out-of-plane motion (v y ) and the velocity magnitude exhibit the expected 2D circular-symmetric parabolic shape. It shown that the ultrasound method is suitable for real-time data acquisition as opposed to magnetic resonance imaging (MRI). The results demonstrate that the 3D TO method is capable of performing 3D vector flow imaging.

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A 3 MHz two dimensional array based on piezocomposite for medical imaging

Cited by 16 publications

References 5 publications

A transverse oscillation approach for estimation of three-dimensional velocity vectors, Part II: experimental validation

A transverse oscillation approach for estimation of three-dimensional velocity vectors, Part II: experimental validation

New developments in vector velocity imaging using the transverse oscillation approach

Preliminary examples of 3D vector flow imaging

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