%0 Journal Article %T In-Vivo NMR of Hyperpolarized Helium-3 in the Human Lung at Very Low Magnetic Fields %A Christopher P. Bidinosti %A Jamal Choukeife %A Pierre-Jean Nacher %A Genevi¨¨ve Tastevin %J Physics %D 2002 %I arXiv %R 10.1016/S1090-7807(02)00198-2 %X We present NMR measurements of the diffusion of hyperpolarized helium-3 in the human lung performed at fields much lower than those of conventional MRI scanners. The measurements were made on standing subjects using homebuilt apparatus operating at 3 mT. Oxygen-limited transverse relaxation (T2 up to 15-35 s) could be measured in-vivo. Accurate global diffusion measurements have been performed in-vivo and in-vitro. 1D ADC mapping with high SNR demonstrates the real possibility of performing quality lung imaging at extremely low fields. %U http://arxiv.org/abs/physics/0207129v2