PT - JOURNAL ARTICLE AU - B.E. Dewey AU - X. Xu AU - L. Knutsson AU - A. Jog AU - J.L. Prince AU - P.B. Barker AU - P.C.M. van Zijl AU - R. Leigh AU - P. Nyquist TI - MTT and Blood-Brain Barrier Disruption within Asymptomatic Vascular WM Lesions AID - 10.3174/ajnr.A7165 DP - 2021 Aug 01 TA - American Journal of Neuroradiology PG - 1396--1402 VI - 42 IP - 8 4099 - http://www.ajnr.org/content/42/8/1396.short 4100 - http://www.ajnr.org/content/42/8/1396.full SO - Am. J. Neuroradiol.2021 Aug 01; 42 AB - BACKGROUND AND PURPOSE: White matter lesions of presumed ischemic origin are associated with progressive cognitive impairment and impaired BBB function. Studying the longitudinal effects of white matter lesion biomarkers that measure changes in perfusion and BBB patency within white matter lesions is required for long-term studies of lesion progression. We studied perfusion and BBB disruption within white matter lesions in asymptomatic subjects.MATERIALS AND METHODS: Anatomic imaging was followed by consecutive dynamic contrast-enhanced and DSC imaging. White matter lesions in 21 asymptomatic individuals were determined using a Subject-Specific Sparse Dictionary Learning algorithm with manual correction. Perfusion-related parameters including CBF, MTT, the BBB leakage parameter, and volume transfer constant were determined.RESULTS: MTT was significantly prolonged (7.88 [SD, 1.03] seconds) within white matter lesions compared with normal-appearing white (7.29 [SD, 1.14] seconds) and gray matter (6.67 [SD, 1.35] seconds). The volume transfer constant, measured by dynamic contrast-enhanced imaging, was significantly elevated (0.013 [SD, 0.017] minutes−1) in white matter lesions compared with normal-appearing white matter (0.007 [SD, 0.011] minutes−1). BBB disruption within white matter lesions was detected relative to normal white and gray matter using the DSC-BBB leakage parameter method so that increasing BBB disruption correlated with increasing white matter lesion volume (Spearman correlation coefficient = 0.44; P < .046).CONCLUSIONS: A dual-contrast-injection MR imaging protocol combined with a 3D automated segmentation analysis pipeline was used to assess BBB disruption in white matter lesions on the basis of quantitative perfusion measures including the volume transfer constant (dynamic contrast-enhanced imaging), the BBB leakage parameter (DSC), and MTT (DSC). This protocol was able to detect early pathologic changes in otherwise healthy individuals.cSVDcerebrovascular small-vessel diseaseDCEdynamic contrast-enhancedGdgadoliniumK2BBB leakage parameterKtransvolume transfer constantWMLwhite matter lesion