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MRI‐based computational fluid dynamics for diagnosis and treatment prediction: Clinical validation study in patients with coarctation of aorta
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Leonid Goubergrits Eugenie Riesenkampff Pavlo Yevtushenko Jens Schaller Ulrich Kertzscher Anja Hennemuth Felix Berger Stephan Schubert Titus Kuehne 《Journal of magnetic resonance imaging : JMRI》2015,41(4):909-916
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Realistic aortic phantom to study hemodynamics using MRI and cardiac catheterization in normal and aortic coarctation conditions
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Jesús Urbina MD Julio A. Sotelo PhD Daniel Springmüller MD Cristian Montalba BS Karis Letelier MS Cristián Tejos PhD Pablo Irarrázaval PhD Marcelo E. Andia MD PhD Reza Razavi MD Israel Valverde MD Sergio A. Uribe PhD 《Journal of magnetic resonance imaging : JMRI》2016,44(3):683-697
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Whole‐heart coronary MR angiography using image‐based navigation for the detection of coronary anomalies in adult patients with congenital heart disease
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Markus Henningsson PhD Tarique Hussain MD Miguel S. Vieira MD Gerald F. Greil MD Jouke Smink MSc Gerald v Ensbergen MSc Gabrielle Beck MSc Rene M. Botnar PhD 《Journal of magnetic resonance imaging : JMRI》2016,43(4):947-955
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Four‐dimensional,multiphase, steady‐state imaging with contrast enhancement (MUSIC) in the heart: A feasibility study in children
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Fei Han Stanislas Rapacchi Sarah Khan Ihab Ayad Isidro Salusky Simon Gabriel Adam Plotnik J. Paul Finn Peng Hu 《Magnetic resonance in medicine》2015,74(4):1042-1049
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R. Edward Hogan MD Viviane Bouilleret MD PhD Ying Rui Liu Lei Wang PhD John P. Williams PhD Bianca Jupp PhD Damian Myers PhD Terence J. O'Brien MD 《Journal of magnetic resonance imaging : JMRI》2009,29(5):1027-1034
Purpose
To report the detection of structural and functional biological changes in living animals using small animal in vivo MRI that complements traditional ex vivo histological techniques. We report the development and validation of the application of large deformation high dimensional mapping (HDM‐LD) segmentation for the hippocampus in the rat.Materials and Methods
High resolution volumetric T2 weighted MRI images were acquired at 4.7 Tesla from six male in‐breed nonepileptic Wistar rats. Two HDM‐LD segmentations of the hippocampus (automated 1 and automated 2) were compared with the manual segmentations of two investigators who independently segmented the hippocampi (manual 1 and manual 2).Results
The mean overlap for the hippocampi between automated 1 and automated 2 for the right hippocampi was 94.4% (SD 1.0) and for the left hippocampi was 94.3% (SD 2.5), while the mean overlap between automated 1 and manual 1 for the right hippocampi was 91.4% (SD 1.3) and for the left hippocampi was 91.9% (SD 1.4). Mean values for absolute differences for comparisons of all the segmentations were the following: automated 1 versus automated 2, 3.2% (SD 1.0); manual 1 versus manual 2 6.82% (SD 5.22); automated 1 versus manual 1 13.0% (SD 1.8).Conclusion
HDM‐LD can be applied to obtain accurate and reproducible three‐dimensional segmentations of the hippocampus from rat MR images. HDM‐LD will be a useful tool for investigations of hippocampal structural changes in vivo in rat models of human disease. J. Magn. Reson. Imaging 2009;29:1027–1034. © 2009 Wiley‐Liss, Inc. 相似文献9.
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4D flow MRI,cardiac function,and T1‐mapping: Association of valve‐mediated changes in aortic hemodynamics with left ventricular remodeling
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Julia Geiger MD Amir A. Rahsepar MD Kenichiro Suwa MD Alex Powell BS Ahmadreza Ghasemiesfe MD Alex J. Barker PhD Jeremy D. Collins MD James C. Carr MD Michael Markl PhD 《Journal of magnetic resonance imaging : JMRI》2018,48(1):121-131
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Kevin Bouaou Ioannis Bargiotas Thomas Dietenbeck Emilie Bollache Gilles Soulat Damian Craiem Sophia Houriez‐Gombaud‐Saintonge Alain De Cesare Umit Gencer Alain Giron Alban Redheuil Emmanuel Messas Didier Lucor Elie Mousseaux Nadjia Kachenoura 《Journal of magnetic resonance imaging : JMRI》2019,50(3):982-993
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Age‐related changes in aortic 3D blood flow velocities and wall shear stress: Implications for the identification of altered hemodynamics in patients with aortic valve disease
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Pim van Ooij PhD Julio Garcia PhD Wouter V. Potters MSc S. Chris Malaisrie MD PhD Jeremy D. Collins MD PhD James C. Carr MD PhD Michael Markl MD Alex J. Barker PhD 《Journal of magnetic resonance imaging : JMRI》2016,43(5):1239-1249
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Adam S. Tenforde Christopher P. Cheng Ga‐Young Suh Robert J. Herfkens Ronald L. Dalman Charles A. Taylor 《Journal of magnetic resonance imaging : JMRI》2010,31(2):425-429
Purpose:
To evaluate rest and exercise hemodynamics in patients with abdominal aortic aneurysms (AAA) and peripheral occlusive disease (claudicants) using phase‐contrast MRI.Materials and Methods:
Blood velocities were acquired by means of cardiac‐gated cine phase‐contrast in a 0.5 Tesla (T) open MRI. Volumetric flow was calculated at the supraceliac (SC), infrarenal (IR), and mid‐aneurysm (MA) levels during rest and upright cycling exercise using an MR‐compatible exercise cycle.Results:
Mean blood flow increased during exercise (AAA: 130%, Claudicants: 136% of resting heart rate) at the SC and IR levels for AAA participants (2.6 ± 0.6 versus 5.8 ± 1.6 L/min, P < 0.001 and 0.8 ± 0.4 versus 5.1 ± 1.7 L/min, P < 0.001) and claudicants (2.3 ± 0.5 versus 4.5 ± 0.9 L/min, P < 0.005 and 0.8 ± 0.2 versus 3.3 ± 0.9 L/min, P < 0.005). AAA participants had a significant decrease in renal and digestive blood flow from rest to exercise (1.8 ± 0.7 to 0.7 ± 0.6 L/min, P < 0.01). The decrease in renal and digestive blood flow during exercise correlated with daily activity level for claudicants (R = 0.81).Conclusion:
Abdominal aortic hemodynamic changes due to lower extremity exercise can be quantified in patients with AAA and claudication using PC‐MRI. The redistribution of blood flow during exercise was significant and different between the two disease states. J. Magn. Reson. Imaging 2010; 31: 425–429. © 2010 Wiley‐Liss, Inc.14.
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Jennifer Oudry PhD Jun Chen PhD Kevin J. Glaser PhD Véronique Miette PhD Laurent Sandrin PhD Richard L. Ehman MD 《Journal of magnetic resonance imaging : JMRI》2009,30(5):1145-1150
Purpose:
To cross‐validate two recent noninvasive elastographic techniques, ultrasound‐based transient elastography (UTE) and magnetic resonance elastography (MRE). As potential alternatives to liver biopsy, UTE and MRE are undergoing clinical investigations for liver fibrosis diagnosis and liver disease management around the world. These two techniques use tissue stiffness as a marker for disease state and it is important to do a cross‐validation study of both elastographic techniques to determine the consistency with which the two techniques can measure the mechanical properties of materials.Materials and Methods:
In this study, 19 well‐characterized phantoms with a range of stiffness values were measured by two clinical devices (a Fibroscan and an MRE system based respectively on the UTE and MRE techniques) successively with the operators double‐blinded.Results:
Statistical analysis showed that the correlation coefficient was r2 = 0.93 between MRE and UTE, and there was no evidence of a systematic difference between them within the range of stiffnesses examined.Conclusion:
These two noninvasive methods, MRE and UTE, provide clinicians with important new options for improving patient care regarding liver diseases in terms of the diagnosis, prognosis, and monitoring of fibrosis progression, as well for evaluating the efficacy of treatment. J. Magn. Reson. Imaging 2009;30:1145–1150. © 2009 Wiley‐Liss, Inc. 相似文献16.
Noncontrast mapping of arterial delay and functional connectivity using resting‐state functional MRI: A study in Moyamoya patients
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Thomas Christen PhD Hesamoddin Jahanian PhD Wendy W. Ni MSc Deqiang Qiu PhD Michael E. Moseley PhD Greg Zaharchuk MD PhD 《Journal of magnetic resonance imaging : JMRI》2015,41(2):424-430
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MRI‐determined liver proton density fat fraction,with MRS validation: Comparison of regions of interest sampling methods in patients with type 2 diabetes
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Kim‐Nhien Vu MD Guillaume Gilbert PhD Marianne Chalut Miguel Chagnon MS Gabriel Chartrand BS An Tang MD MS 《Journal of magnetic resonance imaging : JMRI》2016,43(5):1090-1099
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Comparison of fast acquisition strategies in whole‐heart four‐dimensional flow cardiac MR: Two‐center, 1.5 Tesla,phantom and in vivo validation study
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Pankaj Garg MD Jos J.M. Westenberg PhD Pieter J. van den Boogaard BSc Peter P. Swoboda PhD Rahoz Aziz James R.J. Foley MBChB Graham J. Fent MBChB F.G.J. Tyl BSc L. Coratella BSc Mohammed S.M. ElBaz PhD R.J. van der Geest PhD David M. Higgins PhD John P. Greenwood PhD Sven Plein PhD 《Journal of magnetic resonance imaging : JMRI》2018,47(1):272-281
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Vortex‐ring mixing as a measure of diastolic function of the human heart: Phantom validation and initial observations in healthy volunteers and patients with heart failure
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Johannes Töger PhD Mikael Kanski MD PhD Per M. Arvidsson MD Marcus Carlsson MD PhD Sándor J. Kovács PhD MD Rasmus Borgquist MD PhD Johan Revstedt PhD Gustaf Söderlind PhD Håkan Arheden MD PhD Einar Heiberg PhD 《Journal of magnetic resonance imaging : JMRI》2016,43(6):1386-1397