title: Low-temperature polarized helium-3 for MRI applications.
abstract: The first 3He nuclear magnetic resonance (NMR) experiments using low-temperature prepolarization are presented. 3He cells were polarized at 4.2 K and 4.7 T, transported to another magnet, heated to room temperature, and used for NMR experiments at 2.35 T. Cells with and without a rubidium coating were tested. In both cases, the NMR signal was greater than 100 times the thermal equilibrium signal. No evidence of a rubidium coating effect on the longitudinal relaxation time T1 of 3He (500 mbar) at 4.2 K could be demonstrated. NMR gradient-echo images of the cells were acquired.
authors.affiliation: INSERM U438, Université Joseph Fourier, LRC-CEA, Centre Hospitalier Universitaire, Grenoble, France.
authors.forename: F
authors.initials: F
authors.lastname: Kober
authors.forename: P E
authors.initials: PE
authors.lastname: Wolf
authors.forename: J L
authors.initials: JL
authors.lastname: Leviel
authors.forename: G
authors.initials: G
authors.lastname: Vermeulen
authors.forename: G
authors.initials: G
authors.lastname: Duhamel
authors.forename: A
authors.initials: A
authors.lastname: Delon
authors.forename: J
authors.initials: J
authors.lastname: Derouard
authors.forename: M
authors.initials: M
authors.lastname: Décorps
authors.forename: A
authors.initials: A
authors.lastname: Ziegler
mesh_terms: D006371:Helium; D006801:Humans; D007554:Isotopes; D008279:Magnetic Resonance Imaging; D009682:Magnetic Resonance Spectroscopy; D012413:Rubidium
chemical_list: D007554:Isotopes; D006371:Helium; D012413:Rubidium