Geneviève Tastevin

In vivo NMR of hyperpolarized 3He in the human lung at very low magnetic fields.

We present NMR measurements of the diffusion of hyperpolarized 3He 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 3mT. O(2)-limited transverse relaxation (T(2) up to 15-35s) could be measured in vivo. Accurate global diffusion measurements have been performed in vivo and in a plastic bag; the average apparent diffusion coefficient (ADC) in vivo was 14.2+/-0.6mm(2)/s, whereas the diffusion coefficient in the bag (3He diluted in N(2)) was 79.5+/-1mm(2)/s. 1D ADC mapping with high SNR ( approximately 200-300) demonstrates the real possibility of performing quality lung imaging at extremely low fields.

Magnetic field effects on the 1 083 nm atomic line of helium

The structure of the excited

High nuclear polarization in3He and3He-4He gas mixtures by optical pumping with a laser diode

2^{3}

Low-field 3He nuclear magnetic resonance in human lungs

S and

Nuclear Polarization and Heat Conduction Changes in Gaseous 3He

2^{3}

High nuclear polarization of 3He at low and high pressure by metastability exchange optical pumping at 1.5?tesla

P triplet states of

NMR time reversal as a probe of incipient turbulent spin dynamics.

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NMR Instabilities in Highly Magnetised Liquid Helium Solutions

He and

Fundamentals of metastability exchange optical pumping in helium

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NMR diffusion of hyperpolarised 3He in aerogel: a systematic pressure study

He in an applied magnetic field B is studied using different approximations of the atomic Hamiltonian. All optical transitions (line positions and intensities) of the 1083 nm