Zobrazeno 1 - 10
of 30
pro vyhledávání: '"Iason Zacharias Apostolakis"'
Autor:
Jean-Luc Robert, Iason Zacharias Apostolakis, Ali Sadeghi, Francois Guy Gerard Marie Vignon, Can Meral, Junseob Shin
Publikováno v:
2021 IEEE International Ultrasonics Symposium (IUS).
Harmonic imaging is used as default in many ultrasound imaging settings due to its advantages in contrast and resolution compared to fundamental imaging. However, the nonlinear harmonic generation process and higher imaging frequencies induce a stron
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cbf1e1c97e31242517a74d9a1ef7d943
https://doi.org/10.1109/ius52206.2021.9593665
https://doi.org/10.1109/ius52206.2021.9593665
Publikováno v:
Ultrasound Med Biol
A change in elastin and collagen content is indicative of damage caused by hypertension, which changes the non-linear behavior of the vessel wall. This study was aimed at investigating the feasibility of monitoring the non-linear material behavior in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1eb5272f0d492b8ffe48ec22fdbd924a
https://europepmc.org/articles/PMC8693438/
https://europepmc.org/articles/PMC8693438/
Autor:
Matthew D. J. McGarry, James F. McKinsey, Ronny X. Li, Edward Sander Connolly, Iason Zacharias Apostolakis, Ada Ip, Elisa E. Konofagou, Paul Kemper
Publikováno v:
Ultrasound in Medicine & Biology. 45:353-366
Carotid stenosis involves narrowing of the lumen in the carotid artery potentially leading to a stroke, which is the third leading cause of death in the United States. Several recent investigations have found that plaque structure and composition may
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6d3cefa3330956a10191186c3bf0c512
https://doi.org/10.1016/j.ultrasmedbio.2018.07.013
https://doi.org/10.1016/j.ultrasmedbio.2018.07.013
Autor:
Elisa E. Konofagou, Rachel Weber, Paul Kemper, Vittorio Gatti, Pierre Nauleau, Iason Zacharias Apostolakis, Grigorios Marios Karageorgos
Publikováno v:
IEEE Trans Ultrason Ferroelectr Freq Control
Pulse wave imaging (PWI) is an ultrasound imaging modality that estimates the wall stiffness of an imaged arterial segment by tracking the pulse wave propagation. The aim of the present study is to integrate PWI with vector flow imaging, enabling sim
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c36365afc48fa04afc80c75c452b63c0
https://pubmed.ncbi.nlm.nih.gov/33950838
https://pubmed.ncbi.nlm.nih.gov/33950838
Resolution Improvement with a Fully Convolutional Neural Network Applied to Aligned Per-Channel data
Autor:
Iason Zacharias Apostolakis, Jean-Luc Robert, Sheng-Wen Huang, Faik Can Meral, Francois Guy Gerard Marie Vignon, Junseob Shin
Publikováno v:
2020 IEEE International Ultrasonics Symposium (IUS).
The lateral resolution of ultrasound images is determined by the size of the imaging aperture. Computational techniques have been proposed to improve resolution beyond the diffraction limit (Minimum Variance and Compressive Beamforming), but they lac
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1054f5cb3b7b64633bb6f5ace5b4b0b8
https://doi.org/10.1109/ius46767.2020.9251482
https://doi.org/10.1109/ius46767.2020.9251482
Autor:
Jean-Luc Robert, Iason Zacharias Apostolakis, Francois Guy Gerard Marie Vignon, Junseob Shin, Ali Sadeghi, Can Meral
Publikováno v:
2020 IEEE International Ultrasonics Symposium (IUS).
Ultrasound (US) image quality often suffers from random and speckle noise. Especially in the case of difficult patients, increased presence of random noise leads to compromised signal to noise ratio (SNR). The proposed technique removes random or spe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::747911484f34d78b9f78fa392b604527
https://doi.org/10.1109/ius46767.2020.9251578
https://doi.org/10.1109/ius46767.2020.9251578
Autor:
Jason Yu, Junseob Shin, Faik Can Meral, Jean-Luc Robert, Francois Guy Gerard Marie Vignon, Ali Sadeghi, Iason Zacharias Apostolakis
Publikováno v:
2020 IEEE International Ultrasonics Symposium (IUS).
The Wiener postfilter [1] was introduced to ultrasound by Nilsen and Holm as a weighting mask designed to minimize the mean squared error (MSE) between the weighted noisy beamformed signal and the true noiseless signal [2]. Its application requires e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f59645265cb0946d1db09c4fca0cd060
https://doi.org/10.1109/ius46767.2020.9251392
https://doi.org/10.1109/ius46767.2020.9251392
Autor:
Iason Zacharias Apostolakis, Can Meral, Bo Zhang, Guillaume David, Francois Guy Gerard Marie Vignon, Jean-Luc Robert
Publikováno v:
2020 IEEE International Ultrasonics Symposium (IUS).
Compressive Beamforming uses a beamforming matrix in conjunction with a sparsity prior to form high quality ultrasound images from a single or few insonifications. In some cases, due to poor SNR or model mismatch, it is desirable to use a larger numb
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9986d9bed2ed8d2ad08326c405d1b034
https://doi.org/10.1109/ius46767.2020.9251848
https://doi.org/10.1109/ius46767.2020.9251848
Autor:
Rachel Weber, Vittorio Gatti, Pierre Nauleau, Eliza C. Miller, Elisa E. Konofagou, Grigorios Marios Karageorgos, Iason Zacharias Apostolakis, E. Sander Connolly
Publikováno v:
Phys Med Biol
Pulse wave imaging (PWI) is a non-invasive, ultrasound-based technique, which provides information on arterial wall stiffness by estimating the pulse wave velocity (PWV) along an imaged arterial wall segment. The aims of the present study were to: (1
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e58651f4f9cd0902ab4a3ff918f14d51
https://europepmc.org/articles/PMC6980325/
https://europepmc.org/articles/PMC6980325/
Publikováno v:
Journal of Biomechanics. 64:136-144
Accurate arterial stiffness measurement would improve diagnosis and monitoring for many diseases. Atherosclerotic plaques and aneurysms are expected to involve focal changes in vessel wall properties; therefore, a method to image the stiffness variat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cb3aceab83feab679079fb5e85961607
https://doi.org/10.1016/j.jbiomech.2017.09.017
https://doi.org/10.1016/j.jbiomech.2017.09.017