PT - JOURNAL ARTICLE AU - D.B. McCoy AU - J.F. Talbott AU - Michael Wilson AU - M.D. Mamlouk AU - J. Cohen-Adad AU - Mark Wilson AU - J. Narvid TI - MRI Atlas-Based Measurement of Spinal Cord Injury Predicts Outcome in Acute Flaccid Myelitis AID - 10.3174/ajnr.A5044 DP - 2016 Dec 22 TA - American Journal of Neuroradiology 4099 - http://www.ajnr.org/content/early/2016/12/22/ajnr.A5044.short 4100 - http://www.ajnr.org/content/early/2016/12/22/ajnr.A5044.full AB - BACKGROUND AND PURPOSE: Recent advances in spinal cord imaging analysis have led to the development of a robust anatomic template and atlas incorporated into an open-source platform referred to as the Spinal Cord Toolbox. Using the Spinal Cord Toolbox, we sought to correlate measures of GM, WM, and cross-sectional area pathology on T2 MR imaging with motor disability in patients with acute flaccid myelitis.MATERIALS AND METHODS: Spinal cord imaging for 9 patients with acute flaccid myelitis was analyzed by using the Spinal Cord Toolbox. A semiautomated pipeline using the Spinal Cord Toolbox measured lesion involvement in GM, WM, and total spinal cord cross-sectional area. Proportions of GM, WM, and cross-sectional area affected by T2 hyperintensity were calculated across 3 ROIs: 1) center axial section of lesion; 2) full lesion segment; and 3) full cord atlas volume. Spearman rank order correlation was calculated to compare MR metrics with clinical measures of disability.RESULTS: Proportion of GM metrics at the center axial section significantly correlated with measures of motor impairment upon admission (r [9] = −0.78; P = .014) and at 3-month follow-up (r [9] = −0.66; P = .05). Further, proportion of GM extracted across the full lesion segment significantly correlated with initial motor impairment (r [9] = −0.74, P = .024). No significant correlation was found for proportion of WM or proportion of cross-sectional area with clinical disability.CONCLUSIONS: Atlas-based measures of proportion of GM T2 signal abnormality measured on a single axial MR imaging section and across the full lesion segment correlate with motor impairment and outcome in patients with acute flaccid myelitis. This is the first atlas-based study to correlate clinical outcomes with segmented measures of T2 signal abnormality in the spinal cord.Abbreviations%CSAproportion of cross-sectional area%GMproportion of gray matter%WMproportion of white matterAFMacute flaccid myelitisEVenterovirusMRCMedical Research CouncilSCspinal cordSCTSpinal Cord Toolbox