Ultrasonic computed tomography based on full-waveform inversion for bone quantitative imaging

Bernard, Simon; Monteiller, Vadim; Komatitsch, Dimitri; Lasaygues, Philippe

doi:10.1088/1361-6560/aa7e5a

Cited by 87 publications

(64 citation statements)

References 70 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…1b, the measured data consist of predominately low-frequency content. Accurate recovery of the sound speed distribution, and in turn accurate JR, can be challenging from high-frequency data due to the phenomenon of cycle skipping [53, 8]. Cycle skipping occurs when the cumulative phase error for a given frequency component exceeds π (or, equivalently, the traveltime error exceeds half of the period).…”

Section: Description Of Computer-simulation Studiesmentioning

confidence: 99%

Parameterized Joint Reconstruction of the Initial Pressure and Sound Speed Distributions for Photoacoustic Computed Tomography

Matthews¹,

Poudel²,

Li³

et al. 2018

SIAM J. Imaging Sci.

View full text Add to dashboard Cite

Abstract. Accurate estimation of the initial pressure distribution in photoacoustic computed tomography (PACT) depends on knowledge of the sound speed distribution. However, the sound speed distribution is typically unknown. Further, the initial pressure and sound speed distributions cannot both, in general, be stably recovered from PACT measurements alone. In this work, a joint reconstruction (JR) method for the initial pressure distribution and a low-dimensional parameterized model of the sound speed distribution is proposed. By employing a priori information about the structure of the sound speed distribution, both the initial pressure and sound speed can be accurately recovered. The JR problem is solved by use of a proximal optimization method that allows constraints and nonsmooth regularization functions for the initial pressure distribution. The gradients of the cost function with respect to the initial pressure and sound speed distributions are calculated by use of an adjoint state method that has the same per-iteration computational cost as calculating the gradient with respect to the initial pressure distribution alone. This approach is evaluated through two-dimensional computer-simulation studies for a small animal imaging model and by application to experimental in vivo measurements of a mouse.

show abstract

Section: Description Of Computer-simulation Studiesmentioning

confidence: 99%

Parameterized Joint Reconstruction of the Initial Pressure and Sound Speed Distributions for Photoacoustic Computed Tomography

Matthews¹,

Poudel²,

Li³

et al. 2018

SIAM J. Imaging Sci.

View full text Add to dashboard Cite

show abstract

“…Originally developed within seismology [ 8 , 9 ], FWI has successful applications in exploration seismic (e.g. [ 10 , 11 ]) which has attracted interest in many other areas such as applications in ultrasonic medical tomography [ 12 ], solar interior studies [ 13 ] and ground-penetrating radar [ 14 ]. The strong point of the FWI is to exploit the full information of waveforms to simulate all phenomena wave, whilst most of the imaging techniques use only the travel-time kinematics information.…”

Section: Introductionmentioning

confidence: 99%

An objective function for full-waveform inversion based on frequency-dependent offset-preconditioning

et al. 2020

View full text Add to dashboard Cite

Full-waveform inversion (FWI) is a powerful technique to obtain high-resolution subsurface models, from seismic data. However, FWI is an ill-posed problem, which means that the solution is not unique, and therefore the expert use of the information is required to mitigate the FWI ill-posedness, especially when wide-aperture seismic acquisitions are considered. In this way, we investigate the multiscale frequency-domain FWI by using a weighting operator according to the distances between each source-receiver pair. In this work, we propose a weighting operator that acts on the data misfit as preconditioning of the objective function that depends on the source-receiver distance (offset) and the frequency used during the inversion. The proposed operator emphasizes information from long offsets, especially at low frequencies, and as a consequence improves the update of deep geological structures. To demonstrate the effectiveness of our proposal, we perform numerical simulations on 2D acoustic Marmousi2 case study, which is widely used in seismic imaging tests, considering three different scenarios. In the first two ones, we have used an acquisition geometry with a maximum offset of 4 and 8 km, respectively. In the last one, we have considered all-offsets. The results show that our proposal outperforms similar strategies, for all scenarios, providing more reliable quantitative subsurface models. In fact, our inversion result has the lowest error and the highest similarity to the true model than similar approaches.

show abstract

“…Breast cancer is the most common cancer in women worldwide. To decrease the mortality rate of breast cancer, detection in the early stages with screening is crucial [ 1 , 2 ]. Mammography, hand-held ultrasound, computerized tomography (CT) and magnetic resonance imaging (MRI) are commonly used methods for breast-cancer screening [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

The Application of an Ultrasound Tomography Algorithm in a Novel Ring 3D Ultrasound Imaging System

Liu

Chen

Zhang

et al. 2018

Sensors

View full text Add to dashboard Cite

Currently, breast cancer is one of the most common cancers in women all over the world. A novel 3D breast ultrasound imaging ring system using the linear array transducer is proposed to decrease costs, reduce processing difficulties, and improve patient comfort as compared to modern day breast screening systems. The 1 × 128 Piezoelectric Micromachined Ultrasonic Transducer (PMUT) linear array is placed 90 degrees cross-vertically. The transducer surrounds the mammary gland, which allows for non-contact detection. Once the experimental platform is built, the breast model is placed through the electric rotary table opening and into a water tank that is at a constant temperature of 32 °C. The electric rotary table performs a 360° scan either automatically or mechanically. Pulse echo signals are captured through a circular scanning method at discrete angles. Subsequently, an ultrasonic tomography algorithm is designed, and a horizontal slice imaging is realized. The experimental results indicate that the preliminary detection of mass is realized by using this ring system. Circular scanning imaging is obtained by using a rotatable linear array instead of a cylindrical array, which allows the size and location of the mass to be recognized. The resolution of breast imaging is improved through the adjustment of the angle interval (>0.05°) and multiple slices are gained through different transducer array elements (1 × 128). These results validate the feasibility of the system design as well as the algorithm, and encourage us to implement our concept with a clinical study in the future.

show abstract

Ultrasonic computed tomography based on full-waveform inversion for bone quantitative imaging

Cited by 87 publications

References 70 publications

Parameterized Joint Reconstruction of the Initial Pressure and Sound Speed Distributions for Photoacoustic Computed Tomography

Parameterized Joint Reconstruction of the Initial Pressure and Sound Speed Distributions for Photoacoustic Computed Tomography

An objective function for full-waveform inversion based on frequency-dependent offset-preconditioning

The Application of an Ultrasound Tomography Algorithm in a Novel Ring 3D Ultrasound Imaging System

Contact Info

Product

Resources

About