Results 21 to 30 of about 396,810 (295)

Dual renormalization group flows in 4D [PDF]

Physical Review D, 2019
We present a prescription for using the a central charge to determine the flow of a strongly coupled supersymmetric theory from its weakly coupled dual. The approach is based on the equivalence of the scale-dependent a parameter derived from the four-dilaton amplitude with the a parameter determined from the Lagrange multiplier method with scale ...
Abel, Steven, Bajc, Borut, Sannino, Francesco   +2 more
openaire   +4 more sources

Colour Constrained 4D Flow [PDF]

Procedings of the British Machine Vision Conference 2005, 2005
The addition of colour information to the computation of range/scene flow is proposed to improve its accuracy and robustness to ambiguities. This is applied in the form of additional optical flow constraints from aligned colour image data. Combining constraints gives improved velocity displacement fields for both synthetic and real datasets over using ...
Tim C. Lukins, Robert B. Fisher
openaire   +1 more source

Longitudinal Evaluation of Aortic Haemodynamics in Patients after Repair of Aortic Coarctation: A 4D Flow MRI Follow-Up Study [PDF]

, 2022
Background: Patients after repair of Aortic Coarctation (CoA) have high risk of secondary vessel pathologies, regular monitoring is absolutely essential.
Romberg, Julia, Geiger, Julia; https://orcid.org/, Stiller, Brigitte, Hirtler, Daniel   +3 more
core   +1 more source

Influence of Spatial Resolution and Compressed SENSE Acceleration Factor on Flow Quantification with 4D Flow MRI at 3 Tesla

Tomography, 2022
Four-dimensional (4D) flow MRI allows quantifying flow in blood vessels–non invasively and in vivo. The clinical use of 4D flow MRI in small vessels, however, is hampered by long examination times and limited spatial resolution.
Mariya S. Pravdivtseva, Franziska Gaidzik, Philipp Berg, Patricia Ulloa, Naomi Larsen, Olav Jansen, Jan-Bernd Hövener, Mona Salehi Ravesh   +7 more
doaj   +1 more source

Abdominal Applications of 4D Flow MRI [PDF]

RöFo - Fortschritte auf dem Gebiet der Röntgenstrahlen und der bildgebenden Verfahren, 2020
Background Four-dimensional flow magnetic resonance imaging (4D flow MRI) provides volumetric and time-resolved visualization and quantification of blood flow. This review presents an overview of possible applications of 4D flow MRI for non-invasive assessment of abdominal hemodynamics.
Christoph, Riedel, Alexander, Lenz, Lutz, Fischer, Jun, Li, Feilix, Piecha, Johannes, Kluwe, Gerhard, Adam, Peter, Bannas   +7 more
openaire   +2 more sources

Mitral valve regurgitation assessed by intraventricular CMR 4D-flow: a systematic review on the technological aspects and potential clinical applications [PDF]

, 2023
Cardiac magnetic resonance (CMR) four-dimensional (4D) flow is a novel method for flow quantification potentially helpful in management of mitral valve regurgitation (MVR).
Jung, Bernd, Jessica A. M. Bastiaansen, Benedikt Bernhard, Safarkhanlo, Yasaman, Bastiaansen, Jessica A M, Eva S. Peper, Christoph Gräni, Kwong, Raymond Y, Raymond Y. Kwong, Peper, Eva S, Bernd Jung, Bernhard, Benedikt, Yasaman Safarkhanlo, Gräni, Christoph   +13 more
core   +1 more source

Visualization of flow dynamics in the portal circulation using 320-detector-row computed tomography: a feasibility study

European Radiology Experimental, 2021
Multidetector row computed tomography (CT) scanners perform dynamic scanning and have a wide scan range. Time-resolved three-dimensional CT (i.e., 4D CT) has recently enabled visualization of flow in neurovascular vessels.
Ken Kageyama, Akira Yamamoto, Atsushi Jogo, Shinichiro Izuta, Daisuke Himoto, Akihiko Kakimi, Etsuji Sohgawa, Yukio Miki   +7 more
doaj   +1 more source

Reduced scan time and superior image quality with 3D flow MRI compared to 4D flow MRI for hemodynamic evaluation of the Fontan pathway

Scientific Reports, 2021
Long scan times prohibit a widespread clinical applicability of 4D flow MRI in Fontan patients. As pulsatility in the Fontan pathway is minimal during the cardiac cycle, acquiring non-ECG gated 3D flow MRI may result in a reduction of scan time while ...
Friso M. Rijnberg, Hans C. van Assen, Joe F. Juffermans, Lucia J. M. Kroft, Pieter J. van den Boogaard, Patrick J. H. de Koning, Mark G. Hazekamp, Séline F. S. van der Woude, Evangeline G. Warmerdam, Tim Leiner, Heynric B. Grotenhuis, Jelle J. Goeman, Hildo J. Lamb, Arno A. W. Roest, Jos J. M. Westenberg   +14 more
doaj   +1 more source

Validation of cardiac index measured by four‐dimensional cardiac magnetic resonance flow against the invasively measured cardiac index in patients with pulmonary hypertension

Pulmonary Circulation, 2023
The purpose of this study was to validate cardiac index (CI) measured noninvasively by four‐dimensional (4D) and two‐dimensional (2D) cardiovascular magnetic resonance (CMR) flows against the invasively measured CI by right heart catheterization (RHC) in
Soha Romeih, Fatma Elkafrawy, Mahmoud Shaaban, Ahmed Hassan, Irini Samuel, Micheal Gergis, Wesam El mozy, Magdi Yacoub   +7 more
doaj   +1 more source

Nilpotent networks and 4D RG flows [PDF]

Journal of High Energy Physics, 2019
Abstract Starting from a general $$ \mathcal{N}=2 $$ N = 2 SCFT, we study the network of $$ \mathcal{N}=1 $$ N
Fabio Apruzzi, Falk Hassler, Jonathan J. Heckman, Thomas B. Rochais   +3 more
openaire   +6 more sources