Kenji Ito1,
Kuniaki Ogasawara2, Masakazu Kobayashi2, Makoto Sasaki1,
Kohsuke Kudo1, Fumio Yamashita1, Satomi Higuchi1,
Jonathan Goodwin1, Ikuko Uwano1, Suguru Yokosawa1
1Division
of Ultrahigh Field MRI, Institute for Biomedical Sciences, Iwate Medical
University, Morioka, Iwate, Japan; 2Department of Neurosurgery,
Iwate Medical University, Morioka, Iwate, Japan
This study investigated cerebral white matter (WM) changes in diffusion fractional anisotropy (FA), which are associated with altered cognitive function after carotid endarterectomy (CEA), by applying tract-based spatial statistics (TBSS). In 11 patients showing postoperative improvement in cognitive function, the mean FA values in the cerebral WM significantly increased after CEA, but no significant changes were found in 78 other patients. Furthermore, FA values in the bilateral frontal WM increased after CEA in patients with improved cognition. TBSS can detect bilateral increases in FA values in the frontal WM, and these increases are associated with cognitive improvement after CEA.