American Journal of Neuroradiology 23:520-527, April 2002
© 2002 American Society of Neuroradiology
BRAIN
Diffusion Tensor MR Imaging of High-Grade Cerebral Gliomas
a Department of Clinical Neurosciences, University of Edinburgh, Western General Hospital, Crewe Road, Scotland
b Department of Medical and Radiological Sciences (Medical Physics), University of Edinburgh, Western General Hospital, Crewe Road, Scotland
Address reprint requests to Saurabh Sinha, Departments of Clinical Neurosciences, University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh EH4 2XU, Scotland
BACKGROUND AND PURPOSE: Optimizing high-grade glioma treatment requires the delineation of edematous and normal brain from tumor, perhaps by using potential differences in the absolute diffusion parameters of water. Our purpose was to determine whether mean diffusivity 
D
and diffusion anisotropic MR imaging data help in this differentiation.
METHODS: Nine patients with high-grade cerebral glioblastoma underwent contrast-enhanced structural and diffusion tensor MR imaging before therapy. Tumor, edematous brain, and apparently normal white matter regions were determined on T2-weighted and contrast-enhanced T1-weighted structural images. Fractional anisotropy (FA) and D were measured in each tissue type. Differences in these values among the tissue types were assessed with a standard analysis of variance.
RESULTS: D was highest in the necrotic tumor core (1825.38 ±404.06) x 10-6 mm2/s, followed by edematous brain (1411.23 ± 322.31) x 10-6 mm2/s, enhancing tumor core (1308.67 ± 292.50) x 10-6 mm2/s, enhancing tumor margin (1229.80 ± 206.80) x 10-6 mm2/s, and normal brain (731.53 ± 35.21) x 10-6 mm2/s. FA was highest in normal brain (0.47 ± 0.08) and lowest in the necrotic core (0.09 ± 0.03). D was significantly different in enhancing tumor margins and edematous brain in all patients; FA was significantly different in only seven. These values were significantly different from those of normal brain in all cases in which they were measurable.
CONCLUSION: D values can be used to differentiate normal white matter, edematous brain, and enhancing tumor margins. Diffusion anisotropic data added no benefit to tissue differentiation. Further studies are required to determine if a D value that corresponds to the limit of tumor invasion can be identified.
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