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355 results on '"Barbone, Paul E."'

2. Recovering vector displacement estimates in quasistatic elastography using sparse relaxation of the momentum equation

Author

Babaniyi, Olalekan A., Oberai, Assad A., and Barbone, Paul E.

Subjects
Physics - Medical Physics
Abstract

We consider the problem of estimating the $2D$ vector displacement field in a heterogeneous elastic solid deforming under plane stress conditions. The problem is motivated by applications in quasistatic elastography. From precise and accurate measurements of one component of the $2D$ vector displacement field and very limited information of the second component, the method reconstructs the second component quite accurately. No a priori knowledge of the heterogeneous distribution of material properties is required. This method relies on using a special form of the momentum equations to filter ultrasound displacement measurements to produce more precise estimates. We verify the method with applications to simulated displacement data. We validate the method with applications to displacement data measured from a tissue mimicking phantom, and in-vivo data; significant improvements are noticed in the filtered displacements recovered from all the tests. In verification studies, error in lateral displacement estimates decreased from about $50\%$ to about $2\%$, and strain error decreased from more than $250\%$ to below $2\%$., Comment: 38 pages, 26 figures

Published
2015

11. Contributors

Author

Aglyamov, Salavat R., primary, Barbone, Paul E., additional, Dahl, Jeremy J., additional, Doyley, Marvin M., additional, Dzyubak, Bogdan, additional, Glaser, Kevin J., additional, Hall, Timothy J., additional, Herickhoff, Carl D., additional, Kennedy, Brendan F., additional, Lerner, Robert M., additional, Oberai, Assad A., additional, Parker, Kevin J., additional, Sampson, David D., additional, Telichko, Arsenii V., additional, Varghese, Tomy, additional, and Wijesinghe, Philip, additional

Published
2019
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18. A Force-Matched Approach to Large-Strain Nonlinearity in Elasticity Imaging for Breast Lesion Characterization

Author

Rosen, David P., Nayak, Rohit, Wang, Yuqi, Gendin, Daniel, Larson, Nicholas B., Fazzio, Robert T., Oberai, Assad A., Hall, Timothy J., Barbone, Paul E., Alizad, Azra, and Fatemi, Mostafa

Abstract

Objective: Ultrasound elasticity imaging is a class of ultrasound techniques with applications that include the detection of malignancy in breast lesions. Although elasticity imaging traditionally assumes linear elasticity, the large strain elastic response of soft tissue is known to be nonlinear. This study evaluates the nonlinear response of breast lesions for the characterization of malignancy using force measurement and force-controlled compression during ultrasound imaging. Methods: 54 patients were recruited for this study. A custom force-instrumented compression device was used to apply a controlled force during ultrasound imaging. Motion tracking derived strain was averaged over lesion or background ROIs and matched with compression force. The resulting force-matched strain was used for subsequent analysis and curve fitting. Results: Greater median differences between malignant and benign lesions were observed at higher compressional forces (p-value < 0.05 for compressional forces of 2-6N). Of three candidate functions, a power law function produced the best fit to the force-matched strain. A statistically significant difference in the scaling parameter of the power function between malignant and benign lesions was observed (p-value = 0.025). Conclusions: We observed a greater separation in average lesion strain between malignant and benign lesions at large compression forces and demonstrated the characterization of this nonlinear effect using a power law model. Using this model, we were able to differentiate between malignant and benign breast lesions. Significance: With further development, the proposed method to utilize the nonlinear elastic response of breast tissue has the potential for improving non-invasive lesion characterization for potential malignancy.

Published
2024
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34. Efficient high-order frequency interpolation of structural dynamic response

Author

Lecomte, Christophe, McDaniel, J. Gregory, Barbone, Paul E., and Pierce, Allan D.

Subjects
Flying-machines -- Design and construction, Aerospace and defense industries, Business
Abstract

A method is presented for interpolating structural dynamic response within a finite frequency band. It is based on a condensation of the equations of motion using the response vectors at interpolation points as a basis. This basis set naturally aligns itself with the eigenvectors whose eigenvalues lie inside the band, resulting in a small condensed model that yields the interpolated response. Combining the Sylvester law of inertia with eigenvalue analysis of the condensed system indicates when the condensation captures the eigenvalues that lie in the band of interest. The high accuracy of the interpolation results from a combination of features: an accurate estimation of eigenvalues and eigenvectors as well as matching the value and slope of the displacement vector projected on the force vector.

Published
2003

44. Stability of harmonic waves in a periodic system and the radiation condition

Author

Barbone, Paul E.

Subjects
Harmonic oscillators -- Research, Science and technology
Abstract

An analysis of two physical systems subjected to the same differential equation reveals that in one system the equation perunits 'unstable' solutions. This system consists of a string with periodic scatterers and is identical to a stable system which functions as a waveguide. The initial or the boundary conditions influence the general solution of the differential equation.

Published
1994

48. Imaging localized neuronal activity at fast time scales through biomechanics

Author

Patz, Samuel, primary, Fovargue, Daniel, additional, Schregel, Katharina, additional, Nazari, Navid, additional, Palotai, Miklos, additional, Barbone, Paul E., additional, Fabry, Ben, additional, Hammers, Alexander, additional, Holm, Sverre, additional, Kozerke, Sebastian, additional, Nordsletten, David, additional, and Sinkus, Ralph, additional

Published
2019
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