Zobrazeno 1 - 10
of 448
pro vyhledávání: '"Kevin J Parker"'
Autor:
Donya Khaledyan, Thomas J Marini, Avice O’Connell, Steven Meng, Jonah Kan, Galen Brennan, Yu Zhao, Timothy M Baran, Kevin J Parker
Publikováno v:
Machine Learning: Science and Technology, Vol 5, Iss 1, p 015042 (2024)
Limited access to breast cancer diagnosis globally leads to delayed treatment. Ultrasound, an effective yet underutilized method, requires specialized training for sonographers, which hinders its widespread use. Volume sweep imaging (VSI) is an innov
Externí odkaz:
https://doaj.org/article/906e775926aa49e99da3a4f2a9a7b21a
Autor:
Kevin J. Parker
Publikováno v:
Acoustics, Vol 5, Iss 2, Pp 575-585 (2023)
In the approaches to elastography, two mathematical operations have been frequently applied to improve the final estimate of shear wave speed and shear modulus of tissues. The vector curl operator can separate out the transverse component of a compli
Externí odkaz:
https://doaj.org/article/4b1a53f1631c4b3bb384b9542dc9a65d
Autor:
Kevin J. Parker, Miguel A. Alonso
Publikováno v:
Acoustics, Vol 4, Iss 4, Pp 958-966 (2022)
The free space solution to the wave equation in spherical coordinates is well known as a separable product of functions. Re-examination of these functions, particularly the sums of spherical Bessel and harmonic functions, reveals behaviors which can
Externí odkaz:
https://doaj.org/article/19f3b3f106034f7ab1a4e10cd3b913b5
Autor:
Lokesh Basavarajappa, Jihye Baek, Shreya Reddy, Jane Song, Haowei Tai, Girdhari Rijal, Kevin J. Parker, Kenneth Hoyt
Publikováno v:
Scientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
Abstract Liver disease is increasing in prevalence across the globe. We present here a multiparametric ultrasound (mpUS) imaging approach for assessing nonalcoholic fatty liver disease (NALFD). This study was performed using rats (N = 21) that were f
Externí odkaz:
https://doaj.org/article/575c851b822e4859abe274637cb02bd9
Publikováno v:
Acoustics, Vol 2, Iss 1, Pp 3-12 (2020)
Ultrasound imaging of the liver is an everyday, worldwide clinical tool. The echoes are produced by inhomogeneities within the interrogated tissue, but what are the mathematical properties of these scatterers? In theory, the spatial correlation funct
Externí odkaz:
https://doaj.org/article/63fe2ef8c93947d5b8cb6253999c3655
Autor:
Fernando Zvietcovich, Pornthep Pongchalee, Panomsak Meemon, Jannick P. Rolland, Kevin J. Parker
Publikováno v:
Nature Communications, Vol 10, Iss 1, Pp 1-13 (2019)
Elastic mapping of individual layers of the cornea with elastography uses Lamb waves, which are dependent on the thickness of each layer and the direction of propagation. Here the authors present Reverberant 3D Optical Coherence Elastography to measu
Externí odkaz:
https://doaj.org/article/536a7e6af1534afd9fdef3a9a8fbc7d5
Autor:
Thomas J. Marini, Benjamin Castaneda, Radha Iyer, Timothy M. Baran, Omar Nemer, Ann M. Dozier, Kevin J. Parker, Yu Zhao, William Serratelli, Gregory Matos, Shania Ali, Bishoy Ghobryal, Adam Visca, Avice O'Connell
Publikováno v:
Journal of Ultrasound in Medicine. 42:817-832
The majority of people in the world lack basic access to breast diagnostic imaging resulting in delay to diagnosis of breast cancer. In this study, we tested a volume sweep imaging (VSI) ultrasound protocol for evaluation of palpable breast lumps tha
Publikováno v:
Acta Biomater
Elastography researchers have utilized several rheological models to characterize soft tissue viscoelasticity over the past thirty years. Due to the frequency-dependent behavior of viscoelastic parameters as well as the different techniques and frequ
Publikováno v:
IEEE Trans Ultrason Ferroelectr Freq Control
In medical imaging, quantitative measurements have shown promise in identifying diseases by classifying normal vs. pathological parameters from tissues. The support vector machine (SVM) has shown promise as a supervised classification algorithm and h
Publikováno v:
Fluids, Vol 5, Iss 4, p 228 (2020)
The microchannel flow model postulates that stress-strain behavior in soft tissues is influenced by the time constants of fluid-filled vessels related to Poiseuille’s law. A consequence of this framework is that changes in fluid viscosity and chang
Externí odkaz:
https://doaj.org/article/fefb3596f39d465fbacf59f744710507