Journal of magnetic resonance imaging : JMRI
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J Magn Reson Imaging · May 2015
Motion artifact reduction in pediatric diffusion tensor imaging using fast prospective correction.
To evaluate the patterns of head motion in scans of young children and to examine the influence of corrective techniques, both qualitatively and quantitatively. We investigate changes that both retrospective (with and without diffusion table reorientation) and prospective (implemented with a short navigator sequence) motion correction induce in the resulting diffusion tensor measures. ⋯ Due to the heterogeneity of brain structures and the comparatively low resolution (∼2 mm) of diffusion data using 2D single shot sequencing, retrospective motion correction is susceptible to distortion from partial voluming. These changes often negatively bias diffusion tensor imaging parameters. Prospective motion correction was shown to produce smaller changes.
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J Magn Reson Imaging · May 2015
Measurements of wall shear stress and aortic pulse wave velocity in swine with familial hypercholesterolemia.
To assess measurements of pulse wave velocity (PWV) and wall shear stress (WSS) in a swine model of atherosclerosis. ⋯ The 4D PC MRI technique provides a promising means of evaluating PWV and WSS in a swine model of atherosclerosis, providing a potential platform for developing the technique for the early detection of atherosclerosis.
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J Magn Reson Imaging · May 2015
Spinal cord response to stepwise and block presentation of thermal stimuli: a functional MRI study.
To examine the characteristics of the spinal cord and brainstem blood oxygenation level-dependent (BOLD) responses to peripheral stimulation in which the temperature is raised in a stepwise fashion, in order to enhance receptor responses, compared to a block design. ⋯ Results from this study demonstrate the means to design thermal sensory paradigms to probe components of sensory processing in the brainstem and spinal cord.