Journal of magnetic resonance imaging : JMRI
-
J Magn Reson Imaging · Aug 2004
MRI of helium-3 gas in healthy lungs: posture related variations of alveolar size.
To probe the variation of alveolar size in healthy lung tissue as a function of posture using diffusion-weighted helium-3 hyperpolarized gas imaging. ⋯ The posture dependent variations in ADC were attributed to compression of the parenchyma under its own weight and the mass of the heart.
-
J Magn Reson Imaging · Aug 2004
Comparative StudyMyocardial delayed enhancement imaging using inversion recovery single-shot steady-state free precession: initial experience.
To evaluate the feasibility of using an inversion recovery single-shot steady-state free precession (SS_SSFP) sequence for myocardial delayed enhancement (MDE) imaging, and to compare SS_SSFP with the conventional inversion recovery segmented fast gradient echo (IR_FGRE) technique. ⋯ SS_SSFP provides adequate image quality compared to IR_FGRE, while requiring a much shorter acquisition time. It is feasible to use SS_SSFP as an alternative method for MDE imaging, especially in patients who have difficulty with holding their breath.
-
J Magn Reson Imaging · Aug 2004
Image construction methods for phased array magnetic resonance imaging.
To study image construction in phased array magnetic resonance imaging (MRI) systems from a statistical signal processing point of view. ⋯ It is demonstrated that phased array MRI reconstruction performance can be improved by the use of more elaborate statistical signal processing algorithms.
-
J Magn Reson Imaging · Aug 2004
Diffusion anisotropy in subcortical white matter and cortical gray matter: changes with aging and the role of CSF-suppression.
To determine the relevance of cerebrospinal fluid (CSF)-suppression for the measurement of diffusion anisotropy in well-localized areas of the brain, particularly the subcortical white matter (WM) within the gyri and cortical gray matter (GM), in young and elderly subjects, and to assess the changes of water diffusivity in the brain with normal aging. ⋯ CSF-suppressed DTI yields more accurate measures of quantitative anisotropy in cortical and subcortical brain regions. Reductions of anisotropy with aging were predominantly observed in subcortical WM of the gyri.
-
J Magn Reson Imaging · Jul 2004
Preferential occult injury of corpus callosum in multiple sclerosis measured by diffusion tensor imaging.
To investigate the feasibility of diffusion tensor imaging (DTI) assessment of microscopic fiber tract injury in the corpus callosum (CC) and other normal-appearing white matter (NAWM) in patients with early multiple sclerosis (MS). ⋯ The water diffusion changes indicate that in the early phase of disease there is a preferential occult injury of CC, which is likely due to the Wallerian degeneration from distant lesions.