Zobrazeno 1 - 10
of 46
pro vyhledávání: '"Tonni F. Johansen"'
Publikováno v:
The Journal of the Acoustical Society of America. 131:4365-4375
Nonlinear propagation of sound has been exploited in the last 15 years in medical ultrasound imaging through tissue harmonic imaging (THI). THI creates an image by filtering the received ultrasound echo around the second harmonic frequency band. This
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0d637bba530ca5f7f52762fda5b80bfd
https://doi.org/10.1121/1.4714773
https://doi.org/10.1121/1.4714773
Autor:
Tonni F. Johansen, Svein-Erik Måsøy, Jochen Deibele, Rune Hansen, Sven Peter Näsholm, Oyvind K.-V. Standal, Bjorn A. J. Angelsen, Thor Andreas Tangen
Publikováno v:
The Journal of the Acoustical Society of America. 128:2695-2703
In this article, acoustic propagation effects of dual-frequency wide-band excitation pulses in a focused ultrasound system are demonstrated in vitro. A designed and manufactured dual-frequency band annular array capable of transmitting 0.9/7.5 MHz ce
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0f31a30b3a75bfaf6ec4384eccffa6c2
https://doi.org/10.1121/1.3488308
https://doi.org/10.1121/1.3488308
Publikováno v:
IEEE Transactions on Instrumentation and Measurement. 59:2843-2853
A novel approach for combined corrosion monitoring and temperature compensation (CMTC) using permanently installed immersion ultrasound probes with a well-defined standoff is presented. Combining subsample delay estimation with knowledge of how the s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::babd602ade0f49e07cd1c536219038a9
https://doi.org/10.1109/tim.2010.2046598
https://doi.org/10.1109/tim.2010.2046598
Publikováno v:
The Journal of the Acoustical Society of America. 127:579-587
A method of acoustic imaging that potentially can improve the diagnostic capabilities of medical ultrasound is presented. The method, given the name SURF (Second order UltRasound Field) imaging, is achieved by processing the received signals from tra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::66203c3c138b8e946c1183779e5bee13
https://doi.org/10.1121/1.3257584
https://doi.org/10.1121/1.3257584
Autor:
Oyvind K.-V. Standal, B.A.J. Angelsen, Tonni F. Johansen, Svein-Erik Måsøy, P. Nasholm, Rune Hansen
Publikováno v:
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. 55:1112-1121
A dual-band method for ultrasound contrast agent detection is demonstrated in vivo in an animal experiment using pigs. The method is named Second-order UltRasound Field Imaging, abbreviated SURF Imaging. It relies on simultaneously transmitting two u
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a5a19c4e2160e72738b6e5af7e5515fd
https://doi.org/10.1109/tuffc.2008.763
https://doi.org/10.1109/tuffc.2008.763
Publikováno v:
The Journal of the Acoustical Society of America. 113:2009-2020
Two-dimensional simulations with propagation through two different heterogeneous human body wall models have been performed to analyze different correction filters for ultrasonic wave aberration due to forward wave propagation. The different models e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0aa22b7b2368046d9059f5be8647a011
https://doi.org/10.1121/1.1559174
https://doi.org/10.1121/1.1559174
Publikováno v:
2014 IEEE International Ultrasonics Symposium.
This paper studies the designs and prototyping of dual layer linear arrays in a multiplexing configuration where each array element has one piezocomposite layer on top of the other. The arrays have 32 elements with 300 µm pitch and 60 µm kerf width
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::02788db3b2101ba599b69a9ce5b5fcf1
https://doi.org/10.1109/ultsym.2014.0238
https://doi.org/10.1109/ultsym.2014.0238
Publikováno v:
Ultrasonics. 54(4)
Silicon-polymer composites fabricated by micromachining technology offer attractive properties for use as matching layers in high frequency ultrasound transducers. Understanding of the acoustic behavior of such composites is essential for using them
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5c710b2260275412078fa152f41f9d33
https://pubmed.ncbi.nlm.nih.gov/24495997
https://pubmed.ncbi.nlm.nih.gov/24495997
Publikováno v:
2012 IEEE International Ultrasonics Symposium.
Ultrasound (US) has been proposed as a guidance tool for spinal intervention. However, bone structures are often visualized poorly in the standard US images which is based on the delay and sum beamforming method (DAS). In this study, we investigate c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::25bd0d5a7fe4a4872f3c0518f7c25491
https://doi.org/10.1109/ultsym.2012.0559
https://doi.org/10.1109/ultsym.2012.0559
Publikováno v:
2012 IEEE International Ultrasonics Symposium.
This paper presents modeling and characterization of a 2-2 silicon-epoxy composite used as matching layer for high frequency transducers. The composite was fabricated using Deep Reactive Ion Etching (DRIE), common in the MEMS industry, to form deep t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dd1608db3f46dba3f266408e8f2cd2a9
https://doi.org/10.1109/ultsym.2012.0558
https://doi.org/10.1109/ultsym.2012.0558