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AJNR Awards, New Junior Editors, and more. Read the latest AJNR updates

Research ArticleHead and Neck ImagingE

Significant Temporal Evolution of Diffusion Anisotropy for Evaluating Early Response to Radiosurgery in Patients with Vestibular Schwannoma: Findings from Functional Diffusion Maps

Y.-C. Lin, C.-C. Wang, Y.Y. Wai, Y.-L. Wan, S.-H. Ng, Y.-L. Chen, H.-L. Liu and J.-J. Wang
American Journal of Neuroradiology February 2010, 31 (2) 269-274; DOI: https://doi.org/10.3174/ajnr.A1799
Y.-C. Lin
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C.-C. Wang
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Y.Y. Wai
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Y.-L. Wan
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S.-H. Ng
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Y.-L. Chen
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H.-L. Liu
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J.-J. Wang
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    Fig 1.

    Schematic representation of data analysis starting from the coregistration of pre- and posttreatment B0 images and resulting in the final coregistered MD, FA, and IVDC maps. The same region of interest is applied for evaluation.

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    Fig 2.

    A−C, Functional diffusion maps of MD (A), FA (B), and IVDC (C) from a patient with left-sided vestibular schwannoma obtained at weeks 2, 4, 8, 12, and 24 after SRS therapy. Regional changes in diffusion indices are plotted on the image to provide a visual representation of tumor response Areas of significantly increased values are shown in red. Blue areas are those characterized by decreased values. Green areas denote voxels without significant change. D, Contrast-enhanced T1-weighted images indicate that central necrosis occurred at week 24 (corresponding to the regions shown at 12 weeks by MD and at 8 weeks by IVDC, white arrows).

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    Fig 3.

    Mean values (n = 6) of fDM in MD (A), FA (B), and IVDC (C) maps as a function of posttreatment time. The fDM volumes were normalized as a percentage of the total tumor volume. VR indicates fractional volume with significantly increased diffusion values; VB, fractional volume with significantly decreased diffusion values. The asterisk indicates P < .05 versus the previous time point. Significant changes occur for MD and IVDC at 8–12 weeks. Changes in FA are evident at 24 weeks.

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    Fig 4.

    Longitudinal changes of mean MD, FA, IVDC, and tumor volumes with time in 6 patients following SRS treatment. The asterisk indicates P < .05 versus the previous time point. IVDC shows an inverse temporal pattern compared with MD. FA decreases continuously.

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American Journal of Neuroradiology: 31 (2)
American Journal of Neuroradiology
Vol. 31, Issue 2
1 Feb 2010
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Significant Temporal Evolution of Diffusion Anisotropy for Evaluating Early Response to Radiosurgery in Patients with Vestibular Schwannoma: Findings from Functional Diffusion Maps
Y.-C. Lin, C.-C. Wang, Y.Y. Wai, Y.-L. Wan, S.-H. Ng, Y.-L. Chen, H.-L. Liu, J.-J. Wang
American Journal of Neuroradiology Feb 2010, 31 (2) 269-274; DOI: 10.3174/ajnr.A1799
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Y.-C. Lin, C.-C. Wang, Y.Y. Wai, Y.-L. Wan, S.-H. Ng, Y.-L. Chen, H.-L. Liu, J.-J. Wang
Significant Temporal Evolution of Diffusion Anisotropy for Evaluating Early Response to Radiosurgery in Patients with Vestibular Schwannoma: Findings from Functional Diffusion Maps
American Journal of Neuroradiology Feb 2010, 31 (2) 269-274; DOI: 10.3174/ajnr.A1799

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