Proton T2 relaxation of cerebral metabolites during transient global ischemia in rat brain.
Putative changes of metabolite T2 relaxation times were investigated before and after a 20-min period of global ischemia in rat brain in vivo (n = 10) using localized proton MRS at different echo times (2.35 T). Neither absolute T2 relaxation times (TE = 20-270 ms) nor time courses of T2-weighted metabolite signals (TE = 135 ms) revealed statistically significant changes during the occlusion or early reperfusion relative to pre-ischemic baseline. These findings are in line with reports of relaxation changes at much later stages and further demonstrate that altered T2 relaxation is not a confounding factor in diffusion-weighted long-TE proton MRS during early ischemic events.
Fujimori
H
H
Biomedizinische NMR Forschungs GmbH am Max-Planck-Institut für Biophysikalische Chemie, Göttingen, Germany.
Michaelis
T
T
Wick
M
M
Frahm
J
J
D000818:Animals; D001224:Aspartic Acid / Q000031:analogs & derivatives / Q000378:metabolism; D001921:Brain / Q000378:metabolism*; D002545:Brain Ischemia / Q000378:metabolism*; D002794:Choline / Q000378:metabolism; D003401:Creatine / Q000378:metabolism; D007091:Image Processing, Computer-Assisted; D007294:Inositol / Q000378:metabolism; D019344:Lactic Acid / Q000378:metabolism; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008297:Male; D011522:Protons; D051381:Rats; D017208:Rats, Wistar
D011522:Protons; D001224:Aspartic Acid; D019344:Lactic Acid; D007294:Inositol; C000179:N-acetylaspartate; D003401:Creatine; D002794:Choline