Fig 3.

Proton MR spectra obtained by using point-resolved spectroscopy in the region of interest in the cerebral hemisphere ipsilateral to the operative site in a 62-year-old man with improved cognition after endarterectomy for symptomatic right internal carotid artery stenosis. Area for the NAA or choline peak to the area for the creatine peak is relatively increased after surgery (NAA/creatine, 1.83; choline/creatine, 1.06) (right graph) compared with the preoperative spectrum (NAA/creatine, 1.56; choline/creatine, 0.86) (left graph).