Multi-parameter inversion with the aid of particle velocity field reconstruction

Taskin, Ulas; Dongen, Koen W. A. van

doi:10.1121/10.0001396

Cited by 4 publications

(2 citation statements)

References 26 publications

(25 reference statements)

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“…The heuristic approach is designed as a fair approach for comparing 2-D and 3-D methods. The accurate reconstruction of SOS with AA/density mismatches and the impact of such mismatches are not the primary focus of this article [ 73 ]. Additionally, measurements were corrupted with Gaussian-independent and identically distributed (i.i.d.)…”

Section: Ase S Tudymentioning

confidence: 99%

A Forward Model Incorporating Elevation-Focused Transducer Properties for 3-D Full-Waveform Inversion in Ultrasound Computed Tomography

Li,

Villa,

Duric

et al. 2023

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

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Ultrasound computed tomography (USCT) is an emerging medical imaging modality that holds great promise for improving human health. Full-waveform inversion (FWI)-based image reconstruction methods account for the relevant wave physics to produce high spatial resolution images of the acoustic properties of the breast tissues. A practical USCT design employs a circular ring-array comprised of elevation-focused ultrasonic transducers, and volumetric imaging is achieved by translating the ring-array orthogonally to the imaging plane. In commonly deployed slice-by-slice (SBS) reconstruction approaches, the 3-D volume is reconstructed by stacking together 2-D images reconstructed for each position of the ring-array. A limitation of the SBS reconstruction approach is that it does not account for 3-D wave propagation physics and the focusing properties of the transducers, which can result in significant image artifacts and inaccuracies. To perform 3-D image reconstruction when elevation-focused transducers are employed, a numerical description of the focusing properties of the transducers should be included in the forward model. To address this, a 3-D computational model of an elevation-focused transducer is developed to enable 3-D FWI-based reconstruction methods to be deployed in ring-array-based USCT. The focusing is achieved by applying a spatially varying temporal delay to the ultrasound pulse (emitter mode) and recorded signal (receiver mode). The proposed numerical transducer model is quantitatively validated and employed in computer simulation studies that demonstrate its use in image reconstruction for ring-array USCT.

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Section: Ase S Tudymentioning

confidence: 99%

A Forward Model Incorporating Elevation-Focused Transducer Properties for 3-D Full-Waveform Inversion in Ultrasound Computed Tomography

Li,

Villa,

Duric

et al. 2023

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

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“…In this work, it is assumed that the mass density ρ(x ) is constant in the whole medium. However, it is also possible to reconstruct both speed of sound and density profiles accurately 18 with the aid of the redatuming methods earlier developed. 19,20 With CSI, the unknown contrast source is updated using an iterative scheme that minimizes the cost function…”

Section: Theorymentioning

confidence: 99%

Contrast source inversion on experimental data: initial results

Taskin¹,

Suzuki²,

Terada³

et al. 2022

Medical Imaging 2022: Ultrasonic Imaging and Tomography

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Quantitative images showing the speed of sound profile of the breast may be obtained by employing full-waveform inversion (FWI) methods on the measured data. These reconstruction methods work well for both dense and normal breasts. Contrast source inversion (CSI) is a frequency domain FWI method. In literature, many examples of successful application of CSI for breast imaging can be found. However, all these works are based on simulated data. In this work, we will present our first results obtained with employing CSI on experimental data. CSI was developed by Delft University of Technology and the experimental data was provided by FUJIFILM Healthcare Corporation. The experimental data is obtained using a ring-shaped transducer which scans a breast-mimicking gelatine phantom. Our initial results obtained with CSI look promising; all inclusions within the phantom are accurately reconstructed.

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