Low-temperature polarized helium-3 for MRI applications.
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.
Kober
F
F
INSERM U438, Université Joseph Fourier, LRC-CEA, Centre Hospitalier Universitaire, Grenoble, France.
Wolf
P E
PE
Leviel
J L
JL
Vermeulen
G
G
Duhamel
G
G
Delon
A
A
Derouard
J
J
Décorps
M
M
Ziegler
A
A
D006371:Helium; D006801:Humans; D007554:Isotopes; D008279:Magnetic Resonance Imaging; D009682:Magnetic Resonance Spectroscopy; D012413:Rubidium
D007554:Isotopes; D006371:Helium; D012413:Rubidium