title: Measurement of cerebrospinal fluid oxygen partial pressure in humans using MRI.
abstract: Fluid-attenuated inversion recovery (FLAIR) images obtained during the administration of supplemental oxygen demonstrate a hyperintense signal within the cerebrospinal fluid (CSF) that is likely caused by T1 changes induced by paramagnetic molecular oxygen. Previous studies demonstrated a linear relationship between the longitudinal relaxation rate (R1 = 1/T1) and oxygen content, which permits quantification of the CSF oxygen partial pressure (P(csf)O2). In the current study, CSF T1 was measured at 1.5 T in the lateral ventricles, third ventricle, cortical sulci, and basilar cisterns of eight normal subjects breathing room air or 100% oxygen. Phantom studies performed with artificial CSF enabled absolute P(csf)O2 quantitation. Regional P(csf)O2 differences on room air were observed, from 65 +/- 27 mmHg in the basilar cisterns to 130 +/- 49 mmHg in the third ventricle. During 100% oxygen, P(csf)O2 increases of 155 +/- 45 and 124 +/- 34 mmHg were measured in the basilar cisterns and cortical sulci, respectively, with no change observed in the lateral or third ventricles. P(csf)O2 measurements in humans breathing room air or 100% oxygen using a T1 method are comparable to results from invasive human and animal studies. Similar approaches could be applied to noninvasively monitor oxygenation in many acellular, low-protein body fluids.
authors.affiliation: Department of Radiology, University of California-San Francisco, San Francisco, California 94143-0628, USA.
authors.forename: Greg
authors.initials: G
authors.lastname: Zaharchuk
authors.forename: Alastair J
authors.initials: AJ
authors.lastname: Martin
authors.forename: Guy
authors.initials: G
authors.lastname: Rosenthal
authors.forename: Geoffery T
authors.initials: GT
authors.lastname: Manley
authors.forename: William P
authors.initials: WP
authors.lastname: Dillon
mesh_terms: D000328:Adult; D000465:Algorithms; D001921:Brain / Q000378:metabolism*; D006801:Humans; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000295:instrumentation / Q000379:methods*; D010100:Oxygen / Q000134:cerebrospinal fluid*; D019047:Phantoms, Imaging; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014018:Tissue Distribution
chemical_list: D010100:Oxygen