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Abstract

MR imaging of compact white matter pathways.

J T Curnes, P C Burger, W T Djang and O B Boyko
American Journal of Neuroradiology November 1988, 9 (6) 1061-1068;
J T Curnes
Department of Radiology, Duke University Medical Center, Durham, NC 27710.
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P C Burger
Department of Radiology, Duke University Medical Center, Durham, NC 27710.
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W T Djang
Department of Radiology, Duke University Medical Center, Durham, NC 27710.
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O B Boyko
Department of Radiology, Duke University Medical Center, Durham, NC 27710.
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Abstract

A prominent decreased signal intensity can be seen in many of the heavily myelinated, compact fiber pathways of the brain on T2-weighted spin-echo MR images (TR = 2500 msec, TE = 80 msec). These areas include the anterior commissure, internal capsule, optic tract and radiations, fornix, mammillothalamic tract, superior frontooccipital fasciculus, cingulum, corpus callosum, uncinate fasciculus, and superior longitudinal fasciculus. All these pathways could be identified in normal subjects 3 years old and older when 1.5-T axial and coronal images of 50 adults and 17 children were reviewed. Correlation of the in vivo and postmortem MR appearance of two human brains with Perls and Luxol fast blue stains indicates that the short T2 reflects heavy myelination and fiber density, not iron deposition. This is in contrast to the short T2 signal seen in the subcortical U fibers and deep nuclei of the brain that result from iron deposition. These pathways also differ from areas of brain iron accumulation in that (1) they may appear as areas of short T1 on partial-saturation or inversion-recovery pulse sequences and (2) they can be seen with regularity in all patients over 3 years of age. It is important to distinguish between the effect of the myelin sheath and the effect of brain iron on the T2 relaxation values seen in the normal brain since both result in shortened T2 relaxation. The importance of the role of these fiber tracts in disease processes and in modifying the spread of vasogenic edema and tumor needs further investigation.

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American Journal of Neuroradiology
Vol. 9, Issue 6
1 Nov 1988
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MR imaging of compact white matter pathways.
J T Curnes, P C Burger, W T Djang, O B Boyko
American Journal of Neuroradiology Nov 1988, 9 (6) 1061-1068;

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MR imaging of compact white matter pathways.
J T Curnes, P C Burger, W T Djang, O B Boyko
American Journal of Neuroradiology Nov 1988, 9 (6) 1061-1068;
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