  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.
