Zobrazeno 1 - 10
of 40
pro vyhledávání: '"Alfonso Rodriguez-Molares"'
Autor:
Tommy Arild Hammer, Asbjørn Støylen, Lasse Lovstakken, Svein Arne Aase, Torvald Espeland, Sebastien Salles, Alfonso Rodriguez Molares, Hans Torp, Svend Aakhus
Publikováno v:
JACC: Cardiovascular Imaging. 14:1495-1505
Objectives This study aimed to investigate the potential of a novel 3-dimensional (3D) mechanical wave velocity mapping technique, based on the natural mechanical waves produced by the heart itself, to approach a noninvasive 3D stiffness mapping of t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::31097abafcfece4015aeb56050899ae2
https://doi.org/10.1016/j.jcmg.2020.05.037
https://doi.org/10.1016/j.jcmg.2020.05.037
Publikováno v:
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. 66:1198-1208
Many adaptive beamformers claim to produce images with increased contrast, a feature that could enable a better detection of lesions and anatomical structures. Contrast is often quantified using the contrast ratio (CR) and the contrast-to-noise ratio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4d91e178de778a0ea168fa63d466b9a4
https://doi.org/10.1109/tuffc.2019.2911267
https://doi.org/10.1109/tuffc.2019.2911267
Publikováno v:
Ultrasound in Medicine and Biology
Clutter in echocardiography hinders the visualization of the heart and reduces the diagnostic value of the images. The detailed mechanisms that generate clutter are, however, not well understood. We present five different hypotheses for generation of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0f82303f60c02e8a2d399666d8b4d8f1
https://doi.org/10.1016/j.ultrasmedbio.2019.01.010
https://doi.org/10.1016/j.ultrasmedbio.2019.01.010
Publikováno v:
2020 IEEE International Ultrasonics Symposium (IUS).
Spatial resolution is defined as a system's ability to separate targets using some kind of criterion, such as the Rayleigh criterion. However, in practice, lateral resolution is often evaluated by measuring the Full Width Half Maximum (FWHM at -6dB)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9cc3c7e5c09d266cd27745988ccbbdcb
https://doi.org/10.1109/ius46767.2020.9251787
https://doi.org/10.1109/ius46767.2020.9251787
Publikováno v:
IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 67(11)
Reverberations from tissues around the heart often result in cluttered echocardiograms with reduced diagnostic value. As a consequence, some patients must undergo more expensive and, in some cases, invasive imaging modalities. Coherence-based beamfor
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ea094f4136e095dd1bfa2b17d3423fbd
https://pubmed.ncbi.nlm.nih.gov/32746181
https://pubmed.ncbi.nlm.nih.gov/32746181
Autor:
Hans Torp, Jan D'hooge, Alfonso Rodriguez-Molares, Svein-Erik Måsøy, Ole Marius Hoel Rindal, Muyinatu A. Lediju Bell, Andreas Austeng
Publikováno v:
IEEE Trans Ultrason Ferroelectr Freq Control
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
In the last 30 years, the contrast-to-noise ratio (CNR) has been used to estimate the contrast and lesion detectability in ultrasound images. Recent studies have shown that the CNR cannot be used with modern beamformers, as dynamic range alterations
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a2d831d6b06cb1ccb1c3b53eb0d68543
https://pubmed.ncbi.nlm.nih.gov/31796398
https://pubmed.ncbi.nlm.nih.gov/31796398
Autor:
Alfonso Rodriguez-Molares, Johannes Kvam, Stian Solberg, Bjorn A. J. Angelsen, Ola Finneng Myhre
Publikováno v:
The Journal of the Acoustical Society of America. 146(4)
The nonlinear acoustic bulk properties of tissue, e.g., the coefficient of nonlinearity, βn, or the nonlinear bulk elasticity, βp=βnκ0, have been shown to be promising parameters for tissue characterization due to their sensitivity to tissue stru
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::35636869db48d77d3082b6ec17762ecd
https://pubmed.ncbi.nlm.nih.gov/31671951
https://pubmed.ncbi.nlm.nih.gov/31671951
Publikováno v:
2019-October
Proceedings-IEEE Ultrasonics Symposium
Proceedings-IEEE Ultrasonics Symposium
Software beamforming allows more flexible and complex algorithms, often referred to as adaptive beamforming techniques, that are blurring the boundaries between beamforming and image processing. Many adaptive beamforming algorithms claim to improve l
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::606b38580b1b19e53c2dd237a1329748
https://hdl.handle.net/11250/2640104
https://hdl.handle.net/11250/2640104
Publikováno v:
2018 IEEE International Ultrasonics Symposium (IUS).
Retrospective beamforming is a synthetic technique that, by combination of several converging waves, reduces the number of transmission events without reduction of image quality. However, due to a discontinuity in the conventional spherical virtual s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::da592152b613630c97447948c4bbc742
https://doi.org/10.1109/ultsym.2018.8579944
https://doi.org/10.1109/ultsym.2018.8579944
Publikováno v:
2018 IEEE International Ultrasonics Symposium (IUS).
Valvular regurgitation is backflow of blood through a leaky heart valve, and is a prevalent condition (estimated 1–2 % of the population). Because of the lack of widely reliable quantitative predictors of outcome, assessment of valvular regurgitati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6bd7b2549d09db259351f97c42d0ecea
https://doi.org/10.1109/ultsym.2018.8580188
https://doi.org/10.1109/ultsym.2018.8580188