Ultrasound contrast plane wave imaging

Couture, Olivier; Fink, Mathias; Tanter, Mickaël

doi:10.1109/tuffc.2012.2508

Cited by 159 publications

(112 citation statements)

References 25 publications

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“…In PWI, the acoustic pressure is uniformly spread over the insonified medium. As an example, PWI thus helps to preserve microbubbles and improves ultrasound contrast imaging [46]. To sum up, conventional focus imaging is a high-energy slow modality, while PWI is a low-energy fast process.…”

Section: Plane Wave Imaging Vs Dynamic Focusingmentioning

confidence: 99%

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

Garcia¹,

Tarnec²,

Muth³

et al. 2013

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

216

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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Section: Plane Wave Imaging Vs Dynamic Focusingmentioning

confidence: 99%

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

Garcia¹,

Tarnec²,

Muth³

et al. 2013

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

216

165

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show abstract

“…With the development of existing motion correction techniques, e.g. [28]- [29], as well as fast 3-D US acquisition [30], this technique has the potential to greatly enhance the resolution achieved when imaging vasculature deep within the body.…”

Section: Discussionmentioning

confidence: 99%

In Vivo Acoustic Super-Resolution and Super-Resolved Velocity Mapping Using Microbubbles

Christensen-Jeffries

Browning

Tang

et al. 2015

IEEE Trans. Med. Imaging

342

299

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Abstract-The structure of microvasculature cannot be resolved using standard clinical ultrasound (US) imaging frequencies due to the fundamental diffraction limit of US waves. In this work, we use a standard clinical US system to perform in vivo sub-diffraction imaging on a CD1, female mouse aged 8 weeks by localizing isolated US signals from bubbles flowing within the ear microvasculature, and compare our results to optical microscopy. Furthermore, we develop a new technique to map blood velocity at super-resolution by tracking individual bubbles through the vasculature. Resolution is improved from a measured lateral and axial resolution of 112 µm and 94 µm respectively in original US data, to super-resolved images of microvasculature where vessel features as fine as 19 µm are clearly visualized. Velocity maps clearly distinguish opposing flow direction and separated speed distributions in adjacent vessels, thereby enabling further differentiation between vessels otherwise not spatially separated in the image. This technique overcomes the diffraction limit to provide a non-invasive means of imaging the microvasculature at super-resolution, to depths of many centimeters. In the future, this method could noninvasively image pathological or therapeutic changes in the microvasculature at centimeter depths in vivo.

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“…The PWCC method was demonstrated on a 1D array for 2D imaging from previous literature [66][67][68][69]. The intuitive illustration is shown in Figure 4-14.…”

Section: Pwcc For 2d Imagingmentioning

confidence: 99%

A Column-Row-Parallel ASIC architecture for 3D wearable / portable medical ultrasonic imaging

Chen

Lee

Sodini

2014

2014 Symposium on VLSI Circuits Digest of Technical Papers

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This work presents a scalable Column-Row-Parallel ASIC architecture for 3D wearable / portable medical ultrasound. It leverages programmable electronic addressing to achieve linear scaling for both hardware interconnection and software data acquisition. A 16x16 transceiver ASIC is fabricated and flip-chip bonded to a 16x16 capacitive micromachined ultrasonic transducer (CMUT) to demonstrate the compact, low-power front-end assembly. A 3D plane-wave coherent compounding algorithm is designed for fast volume rate (62.5 volume/s), high quality 3D ultrasonic imaging. An interleaved checker board pattern with I&Q excitations is also proposed for ultrasonic harmonic imaging, reducing transmitted second harmonic distortion by over 20dB, applicable to nonlinear transducers and circuits with arbitrary pulse shapes.Each transceiver circuit is element-matched to its CMUT element. The high voltage transmitter employs a 3-level pulse-shaping technique with charge recycling to enhance the power efficiency, requiring minimum off-chip components. Compared to traditional 2-level pulsers, 50% more acoustic power delivery is obtained with the same total power dissipation. The receiver is implemented with a transimpedance amplifier topology and achieves a lowest noise efficiency factor in the literature (2.1 compared to a previously reported lowest of 3.6, in unit of mP a · mW/Hz). A source follower stage is specially designed to combine the analog outputs of receivers in parallel, improving output SNR as parallelization increases and offering flexibility for imaging algorithm design. Lastly, fault-tolerance is incorporated into the transceiver to deal with faulty elements within the 2D MEMS transducer array, increasing yield for the system assembly.

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Ultrasound contrast plane wave imaging

Cited by 159 publications

References 25 publications

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

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

In Vivo Acoustic Super-Resolution and Super-Resolved Velocity Mapping Using Microbubbles

A Column-Row-Parallel ASIC architecture for 3D wearable / portable medical ultrasonic imaging

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