Zobrazeno 1 - 10
of 24
pro vyhledávání: '"Karen R. Marutyan"'
Publikováno v:
The Journal of the Acoustical Society of America. 123:2407-2414
In this study the attenuation coefficient and dispersion (frequency dependence of phase velocity) are measured using a phase sensitive (piezoelectric) receiver in a phantom in which two temporally overlapping signals are detected, analogous to the fa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e157d167d8afbeba1cbe801a8921f286
https://doi.org/10.1121/1.2839893
https://doi.org/10.1121/1.2839893
Autor:
James G. Miller, Min Yang, Steven L. Baldwin, Karen R. Marutyan, Mark R. Holland, Kirk D. Wallace
Publikováno v:
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. 54:1360-1369
Increased myocardial stiffness in aging and diabetes that may result in pathologies such as diastolic dysfunction has been attributed, in part, to an increase in cross linking of extracellular matrix proteins such as collagen. With the development of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4f8c3d9fe42428f8d828227b4d22f6fd
https://doi.org/10.1109/tuffc.2007.396
https://doi.org/10.1109/tuffc.2007.396
Publikováno v:
The Journal of the Acoustical Society of America. 122:222-228
Phase cancellation effects can compromise the integrity of ultrasonic measurements performed with phase sensitive receiving apertures. A lack of spatial coherence of the ultrasonic field incident on a phase sensitive receiving array can produce inacc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bca4d07320f3709507de9bcb9cc217a7
https://doi.org/10.1121/1.2735803
https://doi.org/10.1121/1.2735803
Publikováno v:
The Journal of the Acoustical Society of America. 120:EL55-EL61
The goal of this work was to show that the apparent negative dispersion of ultrasonic waves propagating in bone can arise from interference between fast and slow longitudinal modes, each exhibiting positive dispersion. Simulations were carried out us
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::db7f7c89605426e5bc242c958881aa33
https://doi.org/10.1121/1.2357187
https://doi.org/10.1121/1.2357187
Autor:
James G. Miller, Mark R. Holland, Kirk D. Wallace, Steven L. Baldwin, Min Yang, Karen R. Marutyan
Publikováno v:
The Journal of the Acoustical Society of America. 119:3130-3139
Echocardiography requires imaging of the heart with sound propagating at varying angles relative to the predominant direction of the myofibers. The degree of anisotropy of attenuation can significantly influence ultrasonic imaging and tissue characte
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c09d67cae9bb37c320e95f247534a741
https://doi.org/10.1121/1.2188333
https://doi.org/10.1121/1.2188333
Autor:
James G. Miller, Mark R. Holland, Kirk D. Wallace, Min Yang, Karen R. Marutyan, Steven L. Baldwin
Publikováno v:
Ultrasound in Medicine & Biology. 32:603-610
The objectives of this study were to measure the frequency dependence of the ultrasonic velocity in myocardium and to quantify the frequency dependence of phase velocity as a function of the insonification angle relative to the predominant direction
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::add7691847711dd9d3fe5c423d426b57
https://doi.org/10.1016/j.ultrasmedbio.2005.12.002
https://doi.org/10.1016/j.ultrasmedbio.2005.12.002
Autor:
G. Larry Bretthorst, Karen R. Marutyan, Michal Pakula, Pascal Laugier, James G. Miller, Mark R. Holland, Christian C. Anderson, Adam Q. Bauer
Publikováno v:
Bone Quantitative Ultrasound ISBN: 9789400700161
Frequency-dependent phase velocity measurements may prove useful in bone quality assessment. However, the physical mechanisms of ultrasonic wave propagation in cancellous bone that govern phase velocity are not yet fully understood, particularly the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4d4481fb385b574e624cb8c8500cea21
https://doi.org/10.1007/978-94-007-0017-8_12
https://doi.org/10.1007/978-94-007-0017-8_12
Publikováno v:
AIP Conference Proceedings.
Over the last few years there has been an ongoing effort at the Biomedical Magnetic Resonance Laboratory within Washington University to develop data analysis applications using Bayesian probability theory. A few of these applications are specific to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1fd6e8a41f584a7f186ffa212449d798
https://doi.org/10.1063/1.3275636
https://doi.org/10.1063/1.3275636
Publikováno v:
The Journal of the Acoustical Society of America. 121(1)
We recently proposed that the observed apparent negative dispersion in bone can arise from the interference between fast wave and slow wave modes, each exhibiting positive dispersion [Marutyan et al., J. Acoust. Soc. Am. 120, EL55–EL61 (2006)]. In
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::41a9e6d89d05e3a7dced1eaf71fdc482
https://pubmed.ncbi.nlm.nih.gov/17297820
https://pubmed.ncbi.nlm.nih.gov/17297820
Autor:
Christian C. Anderson, Karen R. Marutyan, Keith A. Wear, Mark R. Holland, James G. Miller, G. Larry Bretthorst, Kevin H. Knuth, Ariel Caticha, Julian L. Center, Adom Giffin, Carlos C. Rodríguez
Publikováno v:
AIP Conference Proceedings.
Previous work from our laboratory showed that the widely reported decrease in phase velocity with frequency (negative dispersion) for ultrasonic waves propagating through trabecular bone can arise from the interference of two compressional waves, eac
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1df9a6175dabd89f439e679635473472
https://doi.org/10.1063/1.2821280
https://doi.org/10.1063/1.2821280