Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · Nov 2013
Comparative StudyEffects of the use of multiple scanners and of scanner upgrade in longitudinal voxel-based morphometry studies.
To evaluate the effects of inter-scanner variability (bias) and of scanner upgrade on longitudinal changes in regional gray matter volume. ⋯ The results of our study indicate that, even with scanners of the exact same model, the use of different scanners at different time points significantly influences longitudinal morphometric results, and that scanner upgrade has effects comparable to those of using different scanners at different time points.
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J Magn Reson Imaging · Nov 2013
Comparative StudyClinical application of controlled aliasing in parallel imaging results in a higher acceleration (CAIPIRINHA)-volumetric interpolated breathhold (VIBE) sequence for gadoxetic acid-enhanced liver MR imaging.
To determine whether a controlled aliasing in parallel imaging results in higher acceleration (CAIPIRINHA) technique can improve the image quality of three-dimensional (3D), T1-weighted gradient echo (T1w-GRE) imaging compared with the use of a standard, parallel acquisition technique (PAT). ⋯ The CAIPIRINHA-VIBE was able to provide a higher spatial resolution, T1-weighted imaging with better image quality compared with a standard VIBE.
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J Magn Reson Imaging · Nov 2013
Relationships between hypercarbic reactivity, cerebral blood flow, and arterial circulation times in patients with moyamoya disease.
To evaluate the correlation between angiographic measures of Moyamoya disease and tissue-level impairment from measurements of tissue perfusion and cerebrovascular reactivity (CVR). ⋯ Correlative measures between angiography and hemodynamic methods suggest that BOLD and ASL could be used for expanding the diagnostic imaging infrastructure in Moyamoya patients and potentially tracking tissue response to revascularization.
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J Magn Reson Imaging · Nov 2013
Quantitative tractography and tract shape modeling in amyotrophic lateral sclerosis.
To investigate brain-wide white matter structural changes associated with amyotrophic lateral sclerosis (ALS) using an automatic single seed point tractography-based segmentation method, probabilistic neighborhood tractography (PNT), which provides quantitative measures of both tract integrity and shape. ⋯ ALS, although particularly affecting CST, is associated with subtle changes in white matter tract integrity and shape in several other major fibers within the brain. Correlations between CST integrity and disease progression rate suggest that quantitative tractography may provide useful biomarkers of disease evolution in ALS.
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J Magn Reson Imaging · Nov 2013
Volumetric late gadolinium-enhanced myocardial imaging with retrospective inversion time selection.
To develop and validate a novel free-breathing 3D radial late gadolinium-enhanced magnetic resonance imaging technique (3D LGE-MRI) with isotropic resolution and retrospective inversion time (TI) selection for myocardial viability imaging. ⋯ The 3D LGE-MRI technique demonstrated in this study is a promising alternative for the assessment of myocardial viability in patients who have difficulty sustaining breath-holds for the clinical standard 2D LGE-MRI.