David M. Thomasson

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We show that for magnetic resonance (MR) images with signal-to-noise ratio (SNR) less than 2 it is advantageous to use a phase-corrected real reconstruction, rather than the more usual magnitude reconstruction. We discuss the results of the phase correction algorithm used to experimentally verify the result. We supplement the existing literature by(More)
UNLABELLED The statistical reliability of diffusion property measurements was evaluated in ten healthy subjects using deterministic fiber tracking to localize tracts affected in motor neuron disease: corticospinal tract (CST), uncinate fasciculus (UNC), and the corpus callosum in its entirety (CC), and its genu (GE), motor (CCM), and splenium (SP) fibers(More)
BACKGROUND Susceptibility-based MRI offers a unique opportunity to study neurological diseases such as multiple sclerosis (MS). In this work, we assessed a three-dimensional segmented echo-planar-imaging (3D-EPI) sequence to rapidly acquire high-resolution T2 -weighted and phase contrast images of the whole brain. We also assessed if these images could(More)
PURPOSE To evaluate the feasibility, reproducibility, and technical quality of a dynamic contrast material-enhanced isotropic three-dimensional (3D) volumetric interpolated breath-hold hepatic magnetic resonance (MR) imaging examination. MATERIALS AND METHODS Fifty patients underwent 3D spoiled gradient-echo imaging (4.2/1.8 [repetition time msec/echo(More)
We have analyzed multiple spin echo Na magnetic resonance (MR) images of the normal human brain in four volunteer subjects. Utilizing the much slower T2 decay of the CSF, we obtained images that separate cortex from the surrounding CSF and measured regional T2 of cortex, white matter, CSF, vitreous humor, and superior sagittal sinus. Assuming a sodium(More)
The MR behavior of the sodium-23 nucleus in vivo is a complex problem which has generated considerable interest over the last 20 years. Early studies on excised tissue samples revealed that the sodium nucleus exhibited a two-component T2 relaxation. This biexponential T2 relaxation was characterized by a short component with a T2 = 0.7-4.8 ms, and a long(More)
Introduction: B 1 inhomogeneity has been shown to affect quantitative evaluation of dynamic contrast enhanced MR images of the breast at high fields [1] but this may be important at all field strengths. Previous work demonstrates that in-vivo B 1 field maps can correct for spatially varying flip angles and consequently improve T 1 maps and subsequent Gd(More)
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