Proton NMR imaging in experimental ischemic infarction

• Published in: Stroke (1970) Vol. 14; no. 2; pp. 178 - 184
• Main Authors: Buonanno, F S, Pykett, I L, Brady, T J, Vielma, J, Burt, C T, Goldman, M R, Hinshaw, W S, Pohost, G M, Kistler, J P
• Format: Journal Article
• Language: English
• Published: United States 01.03.1983
• Subjects: Animals; Cerebral Infarction - diagnosis; Gerbillinae; Magnetic Resonance Spectroscopy; Protons; Rats; Tomography, X-Ray Computed
• ISSN: 0039-2499; 1524-4628
• DOI: 10.1161/01.STR.14.2.178

Proton nuclear magnetic resonance (NMR) images depict the distribution and concentration of mobile protons modified by the relaxation times T1 and T2. Using the steady-state-free-precession (SSFP) technique, serial coronal images were obtained sequentially over time in laboratory animals with experimental ischemic infarction. Image changes were evident as early as 2 hours after carotid artery ligation, and corresponded to areas of ischemic infarction noted pathologically. Resulting SSFP images in experimental stroke are contrasted to inversion-recovery NMR images in an illustrative patient with established cerebral infarction. Bulk T1 and T2 measurements were made in vitro in three groups of gerbils: normal, those with clinical evidence of infarction, and those clinically normal after carotid ligature. Infarcted hemispheres had significantly prolonged T1 and T2 (1.47 +/- .12 sec, 76.0 +/- 9.0 msec, respectively) when compared to the contralateral hemisphere (T1 = 1.28 +/- .05 sec, T2 = 58.7 +/- 3.9 msec) or to the other two groups. These data suggest that changes in NMR parameters occur and can be detected by NMR imaging as early as two hours after carotid artery ligation.