Journal of cardiovascular magnetic resonance : official journal of the Society for Cardiovascular Magnetic Resonance
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J Cardiovasc Magn Reson · Jan 2007
First-pass myocardial perfusion cardiovascular magnetic resonance at 3 Tesla.
To test the feasibility of first-pass contrast-enhanced myocardial perfusion imaging at 3 Tesla and to evaluate the change in perfusion index between normal, remote and ischemic myocardium, we obtained perfusion index from healthy subjects and patients with coronary artery stenosis. ⋯ First-pass gadolinium-enhanced myocardial perfusion imaging at 3 Tesla is feasible. The Upslope ratio can differentiate ischemic from non-ischemic myocardium.
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J Cardiovasc Magn Reson · Jan 2007
Risk factors for adverse events during cardiovascular magnetic resonance in congenital heart disease.
To assess the incidence and severity of adverse events (AE) associated with cardiovascular magnetic resonance (CMR) in a large cohort of patients with congenital heart disease and to identify independent risk factors for their occurrence. ⋯ CMR in patients with congenital heart disease has a low rate of AEs. Use of GA and examinations on hospitalized patients are independent risk factors for AEs with the most acutely ill patients at highest risk.
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J Cardiovasc Magn Reson · Jan 2007
Mechanism of late gadolinium enhancement in patients with acute myocardial infarction.
To investigate the mechanism of late gadolinium enhancement in irreversibly damaged myocardium in patients with acute myocardial infarct by determining kinetics of Gd-DTPA over time. ⋯ Enhancement in patients with acute infarction is mainly due to an increased lambda, although reduced wash-in-wash-out adds to the effect. Differentiation between blood and enhanced myocardium may be difficult to achieve, if only little differences of T1 are available. Imaging at a later point will restore the contrast.
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J Cardiovasc Magn Reson · Jan 2007
Diffusion-prepared segmented steady-state free precession: Application to 3D black-blood cardiovascular magnetic resonance of the thoracic aorta and carotid artery walls.
This work developed a three-dimensional (3D) diffusion-prepared segmented steady-steady free precession (DP-SSFP) cardiovascular magnetic resonance (CMR) sequence for black-blood (BB) thoracic aortic and carotid wall visualization. In 14 healthy volunteers, BB CMR of the thoracic aorta (n = 7) and carotid arteries (n = 7) was performed over 12 cm and 3 cm of transversal coverage, respectively, with a single 3D DP-SSFP acquisition and multiple two-dimensional (2D) slices using a T2-weighted (T2W) double inversion-recovery fast spin-echo (DIR-FSE) sequence. ⋯ Adjusted for slice thickness and number of slices, higher effective CNR per unit time (i.e., CNR efficiency) was attained with 3D DP-SSFP than 2D T2W DIR-FSE during thoracic aortic wall imaging (11.6 +/- 1.4 vs. 2.9 +/- 0.5; p < 0.001) and carotid artery wall imaging (10.1 +/- 1.9 vs. 3.1 +/- 0.5; p < 0.001). Diffusion-prepared segmented SSFP is a promising vessel wall CMR sequence that allows for 3D acquisition of thin and contiguous slices with BB image contrast.
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J Cardiovasc Magn Reson · Jan 2006
Assessment of left ventricular outflow tract geometry in non-stenotic and stenotic aortic valves by cardiovascular magnetic resonance.
To assess the geometry and area of the left ventricular outflow tract (LVOT) in non-stenotic and stenotic aortic valves and to determine the aortic valve area (AVA) in non-stenotic valves by magnetic resonance imaging (MRI) using a modified continuity equation. ⋯ The LVOT area calculated from the 3CV-LVOT diameter underestimates the LVOT area compared to planimetry due to an elliptic shape of the LVOT in patients with non-stenotic as well as with stenotic aortic valves. The modified Gorlin equation proved to be less useful to assess AVA in non-stenotic valves, whereas the continuity equation and a modified continuity equation displayed a very good agreement with planimetric area measurements.