Calculation of pressure fields from arbitrarily shaped, apodized, and excited ultrasound transducers
TLDR
A method for simulation of pulsed pressure fields from arbitrarily shaped, apodized and excited ultrasound transducers is suggested, which relies on the Tupholme-Stepanishen method for calculating pulsing pressure fields and can also handle the continuous wave and pulse-echo case.Abstract:
A method for simulation of pulsed pressure fields from arbitrarily shaped, apodized and excited ultrasound transducers is suggested. It relies on the Tupholme-Stepanishen method for calculating pulsed pressure fields, and can also handle the continuous wave and pulse-echo case. The field is calculated by dividing the surface into small rectangles and then Summing their response. A fast calculation is obtained by using the far-field approximation. Examples of the accuracy of the approach and actual calculation times are given. >read more
Citations
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Effects of beam steering in pulsed-wave ultrasound velocity estimation.
TL;DR: This experimental study used a clinical ultrasound system, a tissue-mimicking phantom and a pulsatile waveform to determine peak flow velocity errors for various steering and beam-flow angles, and errors were found to be consistent with the simulation results.
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Fourier based imaging method with steered plane waves and limited-diffraction array beams
Jiqi Cheng,Jian-yu Lu +1 more
TL;DR: In this article, a high frame rate (HFR) imaging theory was extended to include explicitly various transmission schemes such as multiple limited-diffraction array beams and steered plane waves.
Book ChapterDOI
Enhanced Wiener Filter for Ultrasound image denoising
TL;DR: A novel approach for noise reduction is investigated, based on Wiener filter, which is able to locally adapt itself and automatically tuning its kernel means a good combination of edges and details preservation with effective noise reduction can be reached.
Proceedings ArticleDOI
A synthetic aperture focusing technique with optimized beamforming for high-frequency ultrasound
Abstract: At last year's conference, we presented a synthetic aperture image reconstruction technique (PSF-SAFT) for fixed-focus single-element ultrasound transducers. It is based on the correlation of the recorded echo signals with the simulated depth-dependent point spread function (PSF) of the ultrasound imaging system. Compared to conventional delay-and-sum (DAS) methods, it results in a higher signal-to-noise-ratio (SNR) but lower axial and lateral resolution. In this contribution the synthetic aperture focusing technique is further developed by inverse filtering of the simulated PSFs and coherence factor (CF) weighting for increased resolution and suppression of side lobes, respectively. The proposed method was evaluated using a 20 MHz ultrasound system with a spherically-focused transducer. With measurements on a wire phantom the transducer's resolution in focus was determined and compared to DAS-SAFT and PSF-SAFT processed datasets, with and without CF-weighting. While the spatial resolution does not differ significantly, PSF-SAFT with CF-weighting results in the highest reduction of noise and side lobes.
Journal ArticleDOI
Fresnel-based beamforming for low-cost portable ultrasound
Nguyen Man,Jay Mung,Jesse T. Yen +2 more
TL;DR: The simulation and experimental results show that Fresnel beamforming image quality is comparable to traditional delay-and-sum (DAS) beamforming in terms of spatial resolution and contrast-to-noise ratio (CNR) under certain system parameters.
References
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Transient Radiation from Pistons in an Infinite Planar Baffle
TL;DR: In this article, an approach to compute the near and farfield transient radiation resulting from a specified velocity motion of a piston or array of pistons in a rigid infinite baffle is presented.
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Ultrasound Transducers for Pulse-Echo Medical Imaging
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