Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · Jul 2005
Comparative StudyComparison of 0.5-M Gd-DTPA with 1.0-M gadobutrol for magnetic resonance angiography of the supplying arteries of the spinal cord in thoracoabdominal aortic aneurysm patients.
To prospectively compare 0.5-M gadopentetate dimeglumine (Gd-DTPA) with 1.0-M gadobutrol for contrast-enhanced magnetic resonance angiography (CE-MRA) of the blood supplying arteries of the spinal cord in patients referred for open surgical repair of a thoracoabdominal aortic aneurysm (TAAA). ⋯ Using both contrast agents it was possible to visualize the ultrasmall spinal cord arteries in all cases. The use of the 1.0-M contrast agent did not improve image quality of CE-MRA images of the blood supplying arteries of the spinal cord compared to the 0.5-M contrast agent.
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To investigate the effectiveness of slab-selective inversion in pulsed arterial spin labeling with body coil excitation as a means to reduce large vessel contamination of the perfusion signal. ⋯ The data suggest that it is advantageous to replace nonselective global tagging in FAIR perfusion imaging with body coil excitation by spatially-confined tagging to reduce undesired residual tagged blood in large vessels.
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J Magn Reson Imaging · Jul 2005
Apparent diffusion coefficient and fractional anisotropy in spinal cord: age and cervical spondylosis-related changes.
To present the apparent diffusion coefficient (ADC) and fractional anisotropy (FA) change with age in the normal spinal cord and in cervical spondylosis. ⋯ ADC increases and FA decreases with age in the normal spinal cord. Elevated ADC and reduced FA were measured in the spinal cord of spondylosis cases with clinical symptoms of myelopathy.
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J Magn Reson Imaging · Jul 2005
Cardiac CINE imaging with IDEAL water-fat separation and steady-state free precession.
To decompose multicoil CINE steady-state free precession (SSFP) cardiac images acquired at short echo time (TE) increments into separate water and fat images, using an iterative least-squares "Dixon" (IDEAL) method. ⋯ Multicoil IDEAL-SSFP imaging can produce high quality CINE cardiac images with uniform water-fat separation, insensitive to Bo inhomogeneities. This approach provides a new method for reliable fat-suppression in cardiac imaging.
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To establish image parameters for some routine clinical brain MRI pulse sequences at 3.0 T with the goal of maintaining, as much as possible, the well-characterized 1.5-T image contrast characteristics for daily clinical diagnosis, while benefiting from the increased signal to noise at higher field. ⋯ When parameters are adjusted for changes in relaxation rates, routine clinical scans at 3.0 T can provide similar image appearance as 1.5 T, but with superior image quality and/or increased speed.