W Reginold1, J Itorralba2, A C Luedke2, J Fernandez-Ruiz3, J Reginold4, O Islam5, A Garcia6. 1. From the Departments of Medical Imaging (W.R.) Memory Clinics (W.R., A.G.), Division of Geriatric Medicine, Department of Medicine wreginold@qmed.ca. 2. Centre for Neuroscience Studies (J.I., A.G., A.C.L.), Queen's University, Kingston, Ontario, Canada. 3. Facultad de Medicina, (J.F.-R.), Universidad Nacional Autonoma de Mexico, Coyoacán, Mexico. 4. Life Sciences (J.R.), University of Toronto, Toronto, Ontario, Canada. 5. Department of Diagnostic Radiology (O.I.), Kingston General Hospital, Queen's University, Kingston, Ontario, Canada. 6. Memory Clinics (W.R., A.G.), Division of Geriatric Medicine, Department of Medicine Centre for Neuroscience Studies (J.I., A.G., A.C.L.), Queen's University, Kingston, Ontario, Canada.
Abstract
BACKGROUND AND PURPOSE: The impact of white matter hyperintensities on the diffusion characteristics of crossing tracts is unclear. This study used quantitative tractography at 3T MR imaging to compare, in the same individuals, the diffusion characteristics of corpus callosum tracts that crossed white matter hyperintensities with the diffusion characteristics of corpus callosum tracts that did not pass through white matter hyperintensities. MATERIALS AND METHODS: Brain T2 fluid-attenuated inversion recovery-weighted and diffusion tensor 3T MR imaging scans were acquired in 24 individuals with white matter hyperintensities. Tractography data were generated by the Fiber Assignment by Continuous Tracking method. White matter hyperintensities and corpus callosum tracts were manually segmented. In the corpus callosum, the fractional anisotropy, radial diffusivity, and mean diffusivity of tracts crossing white matter hyperintensities were compared with the fractional anisotropy, radial diffusivity, and mean diffusivity of tracts that did not cross white matter hyperintensities. The cingulum, long association fibers, corticospinal/bulbar tracts, and thalamic projection fibers were included for comparison. RESULTS: Within the corpus callosum, tracts that crossed white matter hyperintensities had decreased fractional anisotropy compared with tracts that did not pass through white matter hyperintensities (P = .002). Within the cingulum, tracts that crossed white matter hyperintensities had increased radial diffusivity compared with tracts that did not pass through white matter hyperintensities (P = .001). CONCLUSIONS: In the corpus callosum and cingulum, tracts had worse diffusion characteristics when they crossed white matter hyperintensities. These results support a role for white matter hyperintensities in the disruption of crossing tracts.
BACKGROUND AND PURPOSE: The impact of white matter hyperintensities on the diffusion characteristics of crossing tracts is unclear. This study used quantitative tractography at 3T MR imaging to compare, in the same individuals, the diffusion characteristics of corpus callosum tracts that crossed white matter hyperintensities with the diffusion characteristics of corpus callosum tracts that did not pass through white matter hyperintensities. MATERIALS AND METHODS: Brain T2 fluid-attenuated inversion recovery-weighted and diffusion tensor 3T MR imaging scans were acquired in 24 individuals with white matter hyperintensities. Tractography data were generated by the Fiber Assignment by Continuous Tracking method. White matter hyperintensities and corpus callosum tracts were manually segmented. In the corpus callosum, the fractional anisotropy, radial diffusivity, and mean diffusivity of tracts crossing white matter hyperintensities were compared with the fractional anisotropy, radial diffusivity, and mean diffusivity of tracts that did not cross white matter hyperintensities. The cingulum, long association fibers, corticospinal/bulbar tracts, and thalamic projection fibers were included for comparison. RESULTS: Within the corpus callosum, tracts that crossed white matter hyperintensities had decreased fractional anisotropy compared with tracts that did not pass through white matter hyperintensities (P = .002). Within the cingulum, tracts that crossed white matter hyperintensities had increased radial diffusivity compared with tracts that did not pass through white matter hyperintensities (P = .001). CONCLUSIONS: In the corpus callosum and cingulum, tracts had worse diffusion characteristics when they crossed white matter hyperintensities. These results support a role for white matter hyperintensities in the disruption of crossing tracts.
Authors: M Yoshita; E Fletcher; D Harvey; M Ortega; O Martinez; D M Mungas; B R Reed; C S DeCarli Journal: Neurology Date: 2006-12-26 Impact factor: 9.910
Authors: Alida A Gouw; Alexandra Seewann; Wiesje M van der Flier; Frederik Barkhof; Annemieke M Rozemuller; Philip Scheltens; Jeroen J G Geurts Journal: J Neurol Neurosurg Psychiatry Date: 2010-10-09 Impact factor: 10.154
Authors: Trevor C Wu; Elisabeth A Wilde; Erin D Bigler; Xiaoqi Li; Tricia L Merkley; Ragini Yallampalli; Stephen R McCauley; Kathleen P Schnelle; Ana C Vasquez; Zili Chu; Gerri Hanten; Jill V Hunter; Harvey S Levin Journal: Dev Neurosci Date: 2010-10-14 Impact factor: 2.984
Authors: William Reginold; Kevin Sam; Julien Poublanc; Joe Fisher; Adrian Crawley; David J Mikulis Journal: Neuroradiology Date: 2018-07-20 Impact factor: 2.804
Authors: William Reginold; Angela C Luedke; Justine Itorralba; Juan Fernandez-Ruiz; Omar Islam; Angeles Garcia Journal: Dement Geriatr Cogn Dis Extra Date: 2016-06-22
Authors: Susana Muñoz Maniega; Rozanna Meijboom; Francesca M Chappell; Maria Del C Valdés Hernández; John M Starr; Mark E Bastin; Ian J Deary; Joanna M Wardlaw Journal: Front Neurol Date: 2019-07-25 Impact factor: 4.003