Spatial Compounding Technique to Obtain Rotation Elastogram: A Feasibility Study

Kothawala, AliArshad; Chandramoorthi, Sowmiya; Reddy, N. Ravi Kiran; Thittai, Arun K.

doi:10.1016/j.ultrasmedbio.2017.01.026

Cited by 10 publications

(7 citation statements)

References 28 publications

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“…An observation was that the displacement gradient rotated 90 • inside the loosely bonded lesion compared to the surrounding tissue for u x and u z (Fig. 2a,c; 3a,c) which was also reported in [36]. This rotation in gradient was especially visible in the gradient (s) of the displacements in perpendicular direction (e.g.…”

Section: A Displacementssupporting

confidence: 76%

3-D Single Breath-Hold Shear Strain Estimation for Improved Breast Lesion Detection and Classification in Automated Volumetric Ultrasound Scanners

Hendriks¹,

Chen²,

Hansen³

et al. 2018

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

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Automated breast volume scanner (ABVS) is an ultrasound imaging modality used in breast cancer screening. It has high sensitivity but limited specificity as it is hard to discriminate between benign and malignant lesions by echogenic properties. Specificity might be improved by shear strain imaging as malignant lesions, firmly bonded to its host tissue, show different shear patterns compared to benign lesions, often loosely bonded. Therefore, 3-D quasi-static elastography was implemented in an ABVS-like system. Plane wave instead of conventional focused transmissions were used to reduce scan times within a single breath hold. A 3-D strain tensor was obtained and shear strains were reconstructed in phantoms containing firmly and loosely bonded lesions. Experiments were also simulated in finite-element models (FEMs). Experimental results, confirmed by FEM-results, indicated that loosely bonded lesions showed increased maximal shear strains (~2.5%) and different shear patterns compared to firmly bonded lesions (~0.9%). To conclude, we successfully implemented 3-D elastography in an ABVS-like system to assess lesion bonding by shear strain imaging.

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Section: A Displacementssupporting

confidence: 76%

3-D Single Breath-Hold Shear Strain Estimation for Improved Breast Lesion Detection and Classification in Automated Volumetric Ultrasound Scanners

Hendriks¹,

Chen²,

Hansen³

et al. 2018

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

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“…The proposed method of getting good quality lateral displacement estimates can also lead to improvements in quality of shear strain elastograms, poroelastograms, REs, LDE, among others. 11,12,16,23 The possible applications of the proposed method outside the field of elastography are Doppler blood-flow imaging, photo-acoustic imaging, 36 echocardiography, US microscopy, US therapy, and image guidance. In fact, the improvement in the quality of RE for ABT is already observed in Figures 6 and 8.…”

Section: Discussionmentioning

confidence: 99%

“…For spatial compounding elastography experiments, precompression RF frames were obtained at different insonification angles of −10° to 10° in steps of 1°, which is a setting recommended in several prior works reported in literature. 16,31 Therefore, the number of images used in compounding was 21. When only −5° to 5° angles were used, it yielded 11 frames for compounding.…”

Section: Elastography Data Acquisitionmentioning

confidence: 99%

“…Although most of the articles have described an improvement in the quality of axial strain elastograms through the use of the SDC, there are a few that have described the improvement in lateral displacement tracking quality as well. [14][15][16] It must be noted that there are other approaches that have tried to improve the lateral resolution and LDE by adopting different beamforming techniques. For example, modulation of point spread function (PSF) in the lateral direction has been explored by Sumi, 17 Chen et al, 18 and Liebgott et al 19 Furthermore, recent studies on synthetic aperturebased beamforming have shown to improve the quality of LDE in elastography.…”

Section: Introductionmentioning

confidence: 99%

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Actuator-assisted Subpitch Translation-capable Transducer for Elastography: Preliminary Performance Assessment

Selladurai

Thittai

2020

Ultrason Imaging

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In conventional linear array (CLA)–based elastography tissue compression in one direction (e.g., axial) leads to an expansion in all other directions (lateral, elevation). Therefore, the estimation of the lateral displacements and strains may provide additional information on the tissue mechanical properties. However, these are not exploited fully due to the inherent limitation in lateral sampling. Recently, a method named actuator-assisted beam translation (ABT) was demonstrated to address this issue, wherein the focused beam was translated at subpitch locations using an external bench-top setup. However, because such bench-top setup may be impractical for routine clinical use, an ultrasound transducer was customized to have an internal actuator. The performance of the customized transducer was studied through experiments on phantoms for rotation elastography application, which requires precise lateral displacement estimation. Furthermore, the results obtained from ABT was compared against the currently practiced spatial displacement compounding (SDC) method, which is known to yield better quality lateral displacement estimates than conventional approaches. The results show that the ABT method yields a full-width half-maximum (FWHM) value, taken from the lateral profile across a point scatterer, which is 65% and 24% smaller than that obtained using CLA and SDC methods, respectively. Furthermore, the contrast-to-noise ratio (CNR) estimated from rotation elastogram obtained using ABT method is better by 300% and 35% compared with that obtained by using CLA and SDC methods, respectively. Furthermore, the results demonstrate an additional advantage of having larger field of view (FoV) for the ABT method compared with spatial compounding approach.

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“…[14][15][16][17] Likewise, information on lesion mobility can be provided by estimating the shear strain components [18][19][20][21] or rotation elastograms. 22,23 Bonding information could be helpful for distinguishing benign from malignant lesions when stiffness alone remains insufficient, since benign lesions tend to be loosely bonded, whereas malignant ones are more firmly bonded to the surrounding tissues. This more or less mobility of lesions should result in different shear strain features.…”

Section: Introductionmentioning

confidence: 99%

Regularization-Based 2D Strain Tensor Imaging in Quasi-Static Ultrasound Elastography SAGE Publications

et al. 2023

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Accurately estimating all strain components in quasi-static ultrasound elastography is crucial for the full analysis of biological media. In this study, 2D strain tensor imaging was investigated, focusing on the use of a regularization method to improve strain images. This method enforces the tissue property of (quasi-) incompressibility, while penalizing strong field variations, to smooth the displacement fields and reduce the noise in the strain components. The performance of the method was assessed with numerical simulations, phantoms, and in vivo breast tissues. For all the media examined, the results showed a significant improvement in both lateral displacement and strain, while axial fields were only slightly modified by the regularization. The introduction of penalty terms allowed us to obtain shear strain and rotation elastograms where the patterns around the inclusions/lesions were clearly visible. In phantom cases, the findings were consistent with the results obtained from the modeling of the experiments. Finally, the easier detectability of the inclusions/lesions in the final lateral strain images was associated with higher elastographic contrast-to-noise ratios (CNRs), with values in the range of [0.54–9.57] versus [0.08–0.38] before regularization.

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Spatial Compounding Technique to Obtain Rotation Elastogram: A Feasibility Study

Cited by 10 publications

References 28 publications

3-D Single Breath-Hold Shear Strain Estimation for Improved Breast Lesion Detection and Classification in Automated Volumetric Ultrasound Scanners

3-D Single Breath-Hold Shear Strain Estimation for Improved Breast Lesion Detection and Classification in Automated Volumetric Ultrasound Scanners

Actuator-assisted Subpitch Translation-capable Transducer for Elastography: Preliminary Performance Assessment

Regularization-Based 2D Strain Tensor Imaging in Quasi-Static Ultrasound Elastography SAGE Publications

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