Browsing by Author "Razavi, Reza"

Now showing 1 - 10 of 10
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    3D Undersampled Golden-Radial Phase Encoding for DCE-MRA Using Inherently Regularized Iterative SENSE
    (2010) Prieto, Claudia; Uribe Arancibia, Sergio A.; Razavi, Reza; Atkinson, David; Schaeffter, Tobias
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    A realistic MR compatible aortic phantom to validate hemodynamic parameters from MRI data: aortic coarctation patients comparison using catheterization
    (2015) Urbina, Jesus; Sotelo Parraguez, Julio Andrés; Tejos Núñez, Cristián Andrés; Irarrázaval Mena, Pablo; Andía Kohnenkampf, Marcelo Edgardo; Razavi, Reza; Valverde, Israel; Uribe Arancibia, Sergio A.
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    Assesment of cardiac volumes in children with congenital heart disease using a 3D dual cardiac phase technique and a new segmentation tool
    (2010) Hussain, Tarique; Bellsham-Revell, Hannah; Uribe Arancibia, Sergio A.; Bell, Aaron; Razavi, Reza; Beerbaum, Philipp B.; Valverde, Isra; Schaeffter, Tobias; Greil, Gerald F.
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    Congenital Heart Disease in Children: Coronary MR Angiography during Systole and Diastole with Dual Cardiac Phase Whole-Heart Imaging
    (RADIOLOGICAL SOC NORTH AMERICA, 2011) Uribe, Sergio; Hussain, Tarique; Valverde, Israel; Tejos, Cristian; Irarrazaval, Pablo; Fava, Mario; Beerbaum, Philipp; Botnar, Rene M.; Razavi, Reza; Schaeffter, Tobias; Greil, Gerald F.
    Purpose: To assess the optimal timing for coronary magnetic resonance (MR) angiography in children with congenital heart disease by using dual cardiac phase whole-heart MR imaging.
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    Functional cardiac MRI in preterm and term newborns
    (B M J PUBLISHING GROUP, 2011) Groves, Alan M.; Chiesa, Gaia; Durighel, Giuliana; Goldring, Stephen T.; Fitzpatrick, Julie A.; Uribe, Sergio; Razavi, Reza; Hajnal, Jo V.; Edwards, A. David
    Objective To use cardiac MRI techniques to assess ventricular function and systemic perfusion in preterm and term newborns, to compare techniques to echocardiographic methods, and to obtain initial reference data.
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    Improving congenital heart disease imaging using 3d whole-heart dual-phase MRI
    (2011) Hussain, Tarique; Uribe Arancibia, Sergio A.; Lossnitzer, Dirk; Bellsham-Revell, Hannah; Valverde, Israel; Razavi, Reza; Beerbaum, Phillip; Bell, Aaron; Botnar, René Michael; Schaeffter, Tobias
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    New Respiratory Gating Technique for Whole Heart Cine Imaging: Integration of a Navigator Slice in Steady State Free Precession Sequences
    (WILEY-BLACKWELL, 2011) Uribe, Sergio; Tejos, Cristian; Razavi, Reza; Schaeffter, Tobias
    Purpose: To evaluate the performance of a slice navigator sequence integrated into a b-SSFP sequence for obtaining real time respiratory self-gated whole heart cine imaging.
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    Quantification of myocardial scar of different etiology using dark- and bright-blood late gadolinium enhancement cardiovascular magnetic resonance
    (2024) Jada, Lamis; Holtackers, Robert J .; Martens, Bibi; Nies, Hedwig M. J. M.; Van De Heyning, Caroline M.; Botnar, René Michael; Wildberger, Joachim E.; Ismail, Tevfik; Razavi, Reza; Chiribiri, Amedeo
    Dark-blood late gadolinium enhancement (LGE) has been shown to improve the visualization and quantification of areas of ischemic scar compared to standard bright-blood LGE. Recently, the performance of various semi-automated quantification methods has been evaluated for the assessment of infarct size using both dark-blood LGE and conventional bright-blood LGE with histopathology as a reference standard. However, the impact of this sequence on different quantification strategies in vivo remains uncertain. In this study, various semi-automated scar quantification methods were evaluated for a range of different ischemic and non-ischemic pathologies encountered in clinical practice. A total of 62 patients referred for clinical cardiovascular magnetic resonance (CMR) were retrospectively included. All patients had a confirmed diagnosis of either ischemic heart disease (IHD; n = 21), dilated/non-ischemic cardiomyopathy (NICM; n = 21), or hypertrophic cardiomyopathy (HCM; n = 20) and underwent CMR on a 1.5 T scanner including both bright- and dark-blood LGE using a standard PSIR sequence. Both methods used identical sequence settings as per clinical protocol, apart from the inversion time parameter, which was set differently. All short-axis LGE images with scar were manually segmented for epicardial and endocardial borders. The extent of LGE was then measured visually by manual signal thresholding, and semi-automatically by signal thresholding using the standard deviation (SD) and the full width at half maximum (FWHM) methods. For all quantification methods in the IHD group, except the 6 SD method, dark-blood LGE detected significantly more enhancement compared to bright-blood LGE (p < 0.05 for all methods). For both bright-blood and dark-blood LGE, the 6 SD method correlated best with manual thresholding (16.9% vs. 17.1% and 20.1% vs. 20.4%, respectively). For the NICM group, no significant differences between LGE methods were found. For bright-blood LGE, the 5 SD method agreed best with manual thresholding (9.3% vs. 11.0%), while for dark-blood LGE the 4 SD method agreed best (12.6% vs. 11.5%). Similarly, for the HCM group no significant differences between LGE methods were found. For bright-blood LGE, the 6 SD method agreed best with manual thresholding (10.9% vs. 12.2%), while for dark-blood LGE the 5 SD method agreed best (13.2% vs. 11.5%). Semi-automated LGE quantification using dark-blood LGE images is feasible in both patients with ischemic and non-ischemic scar patterns. Given the advantage in detecting scar in patients with ischemic heart disease and no disadvantage in patients with non-ischemic scar, dark-blood LGE can be readily and widely adopted into clinical practice without compromising on quantification.
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    Realistic aortic phantom to study hemodynamics using MRI and cardiac catheterization in normal and aortic coarctation conditions
    (2016) Urbina, Jesús; Sotelo Parraguez, Julio Andrés; Springmüller P., Daniel; Montalba, Cristian; Letelier, Karis; Tejos Núñez, Cristián Andrés; Irarrázaval Mena, Pablo; Andía Kohnenkampf, Marcelo Edgardo; Razavi, Reza; Valverde, Israel; Uribe Arancibia, Sergio A.
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    Single Breath-Hold Assessment of Ventricular Volumes Using 32-Channel Coil Technology and an Extracellular Contrast Agent
    (JOHN WILEY & SONS INC, 2010) Parish, Victoria; Hussain, Tarique; Beerbaum, Philip; Greil, Gerald; Nagel, Eike; Razavi, Reza; Schaeffter, Tobias; Uribe, Sergio
    Purpose: To evaluate the feasibility of a single breath-hold 3D eine balanced steady-state free precession (b-SSFP) sequence after gadolinium diethylenetriamine penta-acetic acid (Gd-DTPA) injection for volumetric cardiac assessment.