In-vivo synthetic aperture and plane wave high frame rate cardiac imaging

Stuart, Matthias Bo; Jensen, Jørgen Arendt; Brandt, Andreas Hjelm; Nikolov, Svetoslav Ivanov; Nielsen, Michael Bachmann

doi:10.1109/ultsym.2014.0298

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…In typical guided interventional procedures, the target depths are within 70mm for inplane angle insertions [39]. For PW transmissions, the area covered by insonification differs with PW steering (figure 2(b)) along with the degree of overlap between PWs in the different regions of the scan plane [17,40,41]. The spherical wave transmissions of STA has larger area of spread and the overlap of the wavefronts from multiple transmissions is greater than PW transmissions [14,40] as illustrated in figure 2(c).…”

Section: Influence Of Needle Insertion Angle/insertion Depthmentioning

confidence: 99%

“…For PW transmissions, the area covered by insonification differs with PW steering (figure 2(b)) along with the degree of overlap between PWs in the different regions of the scan plane [17,40,41]. The spherical wave transmissions of STA has larger area of spread and the overlap of the wavefronts from multiple transmissions is greater than PW transmissions [14,40] as illustrated in figure 2(c). However with increased imaging depth, spherical wave characteristics tend to be planar due to the wave divergence.…”

Section: Influence Of Needle Insertion Angle/insertion Depthmentioning

confidence: 99%

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On the physics of ultrasound transmission for in-plane needle tracking in guided interventions

Malamal

Panicker

2023

Biomed. Phys. Eng. Express

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Objective. In ultrasound (US) guided interventions, the accuratevisualization and tracking of needles is a critical challenge, particularly during in-plane insertions. An inaccurate identification and localization of needles lead tosevere inadvertent complications and increased procedure times. This is due tothe inherent specular reflections from the needle with directivity depending on theangle of incidence of the US beam, and the needle inclination. Approach. Thoughseveral methods have been proposed for improved needle visualization, a detailedstudy emphasizing the physics of specular reflections resulting from the interaction oftransmitted US beam with the needle remains to be explored. In this work, we discussthe properties of specular reflections from planar and spherical wave US transmissionsrespectively through multi-angle plane wave (PW) and synthetic transmit aperture(STA) techniques for in-plane needle insertion angles between 15-50°. Main Results.The qualitative and quantitative results from simulations and experiments reveal thatthe spherical waves enable better visualization and characterization of needles thanplanar wavefronts. The needle visibility in PW transmissions is severely degradedby the receive aperture weighting during image reconstruction than STA due togreater deviation in reflection directivity. It is also observed that the spherical wavecharacteristics starts to alter to planar characteristics due to wave divergence at largeneedle insertion depths. Significance. The study highlights that synergistic transmit-receive imaging schemes addressing the physical properties of reflections from thetransmit wavefronts are imperative for the precise imaging of needle interfaces andhence have strong potential in elevating the quality of outcomes from US guidedinterventional practices.

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Section: Influence Of Needle Insertion Angle/insertion Depthmentioning

confidence: 99%

Section: Influence Of Needle Insertion Angle/insertion Depthmentioning

confidence: 99%

On the physics of ultrasound transmission for in-plane needle tracking in guided interventions

Malamal

Panicker

2023

Biomed. Phys. Eng. Express

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“…Several studies have evaluated the effectiveness of B-mode images using a body-mimicking phantom with a motion velocity that is below or equal to the myocardium speed [5][6][7][8]. Detailed analysis focusing on heart valve dysfunction with a wide range of motion velocities up to a fastest velocity of 0.5 m/s has not been conducted.…”

Section: Introductionmentioning

confidence: 99%

Precise reconstruction of fast moving cardiac valve in high frame rate synthetic transmit aperture ultrasound imaging

et al. 2016

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To diagnose heart valve incompetence, i.e., one of the most serious cardiac dysfunctions, it is essential to obtain images of fast-moving valves at high spatial and temporal resolution. Ultrasound synthetic transmit aperture (STA) imaging has the potential to achieve high spatial resolution by synthesizing multiple pre-beamformed images obtained with corresponding multiple transmissions. However, applying STA to fast-moving targets is difficult due to serious target deformation. We propose a high-frame-rate STA (fast STA) imaging method that uses a reduced number of transmission events needed for each image. Fast STA is expected to suppress deformation of moving targets; however, it may result in deteriorated spatial resolution. In this study, we conducted a simulation study to evaluate fast STA. We quantitatively evaluated the reduction in deformation and deterioration of spatial resolution with a model involving a radially moving valve at the maximum speed of 0.5 m/s. The simulated raw channel data of the valve phantom was processed with offline beamforming programs. We compared B-mode images obtained through single received-line in a transmission (SRT) method, STA, and fast STA. The results show that fast STA with four-times-reduced events is superior in reconstructing the original shape of the moving valve to other methods. The accuracy of valve location is 97 and 100% better than those with SRT and STA, respectively. The resolution deterioration was found to be below the annoyance threshold considering the improved performance of the shape reconstruction. The obtained results are promising for providing more precise diagnostic information on cardiovascular diseases.

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Ultrafast Synthetic Transmit Aperture Imaging Using Hadamard-Encoded Virtual Sources With Overlapping Sub-Apertures

Gong

Song

Chen

2017

IEEE Trans. Med. Imaging

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The development of ultrafast ultrasound imaging offers great opportunities to improve imaging technologies, such as shear wave elastography and ultrafast Doppler imaging. In ultrafast imaging, there are tradeoffs among image signal-to-noise ratio (SNR), resolution, and post-compounded frame rate. Various approaches have been proposed to solve this tradeoff, such as multiplane wave imaging or the attempts of implementing synthetic transmit aperture imaging. In this paper, we propose an ultrafast synthetic transmit aperture (USTA) imaging technique using Hadamard-encoded virtual sources with overlapping sub-apertures to enhance both image SNR and resolution without sacrificing frame rate. This method includes three steps: 1) create virtual sources using sub-apertures; 2) encode virtual sources using Hadamard matrix; and 3) add short time intervals (a few microseconds) between transmissions of different virtual sources to allow overlapping sub-apertures. The USTA was tested experimentally with a point target, a B-mode phantom, and in vivo human kidney micro-vessel imaging. Compared with standard coherent diverging wave compounding with the same frame rate, improvements on image SNR, lateral resolution (+33%, with B-mode phantom imaging), and contrast ratio (+3.8 dB, with in vivo human kidney micro-vessel imaging) have been achieved. The f-number of virtual sources, the number of virtual sources used, and the number of elements used in each sub-aperture can be flexibly adjusted to enhance resolution and SNR. This allows very flexible optimization of USTA for different applications.

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In-vivo synthetic aperture and plane wave high frame rate cardiac imaging

Cited by 4 publications

References 7 publications

On the physics of ultrasound transmission for in-plane needle tracking in guided interventions

On the physics of ultrasound transmission for in-plane needle tracking in guided interventions

Precise reconstruction of fast moving cardiac valve in high frame rate synthetic transmit aperture ultrasound imaging

Ultrafast Synthetic Transmit Aperture Imaging Using Hadamard-Encoded Virtual Sources With Overlapping Sub-Apertures

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