Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · Jan 2009
Combination of Mn(2+)-enhanced and diffusion tensor MR imaging gives complementary information about injury and regeneration in the adult rat optic nerve.
To evaluate manganese (Mn(2+))-enhanced MRI (MEMRI) and diffusion tensor imaging (DTI) as tools for detection of axonal injury and regeneration after intravitreal peripheral nerve graft (PNG) implantation in the rat optic nerve (ON). ⋯ MEMRI and DTI enabled detection of functional and structural degradation after rat ON injury, and there was correlation between the MRI-derived and immunohistochemical measures of axon regeneration.
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J Magn Reson Imaging · Jan 2009
Imaging age-related cognitive decline: A comparison of diffusion tensor and magnetization transfer MRI.
To determine which MR technique was the most sensitive to age-related white matter damage. We compared both diffusion tensor imaging (DTI) and magnetization transfer (MT) maps to determine which technique correlated most strongly with cognitive function in a middle-aged and elderly community population. ⋯ DTI appears the most sensitive imaging parameter to determine age-related white matter damage. The stronger relationship with FA suggests that axonal damage is important in age-related cognitive decline.
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J Magn Reson Imaging · Jan 2009
Novel technique used to detect swallowing in volume-selective turbo spin-echo (TSE) for carotid artery wall imaging.
To improve three-dimensional (3D) volume-selective turbo spin-echo (TSE) carotid wall imaging by the addition of a novel body surface swallowing detection device. ⋯ Image quality can be improved by the algorithm during acquisition. This can be achieved by a novel, anatomically positioned superficial device. This may help in prolonged 3D scans where a single movement can corrupt the entire acquisition.
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J Magn Reson Imaging · Jan 2009
Susceptibility compensated fMRI study using a tailored RF echo planar imaging sequence.
To implement a method using a tailored radiofrequency (TRF) pulse with a quadratic phase profile to recover susceptibility-induced signal losses in gradient-recalled echo-planar images (EPI). ⋯ With reduced maximum phase distribution in the TRF pulse, signals in the susceptibility-affected areas, such as the orbitofrontal and inferior temporal cortex, were increased, suggesting that the technique could be a useful adjunct to fMRI.
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J Magn Reson Imaging · Jan 2009
Diffusion measurements and diffusion tensor imaging with noisy magnitude data.
To compare an unbiased method for estimation of the diffusion coefficient to the quick, but biased, log-linear (LL) method in the presence of noisy magnitude data. ⋯ In the presence of noisy magnitude data, unbiased estimation is essential in diffusion measurements and diffusion tensor imaging.