Original contributionQuantification of complex flow using MR phase imaging—A study of parameters influencing the phase/velocity relation☆
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2024, Journal of Magnetic ResonanceQuantification of peak blood flow velocity at the cardiac valve and great thoracic vessels by four-dimensional flow and two-dimensional phase-contrast MRI compared with echocardiography: a systematic review and meta-analysis
2021, Clinical RadiologyCitation Excerpt :Since its introduction in the late 1980s, two-dimensional (2D) phase-contrast (PC) magnetic resonance imaging (MRI) has been used as a reliable method for evaluation of blood flow.6 Nevertheless, due to inherent technical difficulties and limitations, it has been reported to significantly underestimate peak velocity if the placement of the acquisition plane is misaligned or not orthogonal to the flow of interest.7–9 Moreover, in some complex conditions, prescription of the planes remains challenging in less experienced hands, leading to repeated scans and prolonged total examination times.
Estimation of turbulent kinetic energy using 4D phase-contrast MRI: Effect of scan parameters and target vessel size
2016, Magnetic Resonance ImagingCitation Excerpt :However, TKE estimation was defective and underestimated with low sensitivity when the phase dispersion at the reference scan image was severe that the signal attenuation between the reference and velocity-encoded images could not be clearly observed (Fig. 6). Signal loss due to phase dispersion can be caused by various mechanisms, including an increased velocity in a voxel, fluid acceleration, and voxel size and velocity fluctuations due to turbulence [18–20]. In the present study, the product 4D PC-MRI sequence from Siemens has been employed.
Use of a 1.0 Tesla open scanner for evaluation of pediatric and congenital heart disease: A retrospective cohort study
2015, Journal of Cardiovascular Magnetic ResonanceFlow and peak velocity measurements in patients with aortic valve stenosis using phase contrast MR accelerated with k-t BLAST
2012, European Journal of RadiologyCitation Excerpt :This could be an alternative potential explanation of overestimated peak velocities in the k-t BLAST PC measurements, even though care was taken to exclude such velocity measurements influenced by dephasing effects. It is likely that this feature may have been accentuated in this group of patients where severe stenosis lead to turbulent flow and signal void as a consequence [16]. In a previous study [12] peak velocities using SENSE (R = 2) were higher than the peak velocities using k-t BLAST (R = 6).
Analytical solution of the time-dependent Bloch NMR flow equations: A translational mechanical analysis
2004, Physica A: Statistical Mechanics and its Applications
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This study was supported by grants from the Danish Heart Foundation, The Danish and Swedish Medical Research Councils, and the Swedish Society of Medicine.