Ultra-Low Temperatures in Ultra-High Magnetic Fields

NMR and MRI at ultra - low magnetic fields ( Title )

Laser polarized Xe and a high-Tc Superconducting QUantum Interference Device (SQUID) are used to obtain magnetic resonance images in porous materials at a magnetic field of 2.3 mT, corresponding to a Larmor frequency of 27 kHz. Image resolution of 1 mm is obtained with gradients of only 1 mT/m. The resolution of xenon chemical shifts in different physicochemical environments at ultra-low fields...

Physics in Ultra-strong Magnetic Fields

In magnetic fields stronger than BQ ≡ m 2 ec /h̄e = 4.4 × 10 Gauss, an electron’s Landau excitation energy exceeds its rest energy. I review the physics of this strange regime and some of its implications for the crusts and magnetospheres of neutron stars. In particular, I describe how ultra-strong fields • render the vacuum birefringent and capable of distorting and magnifying images (“magnetic...

Accuracy and Precision in Quantitative Rotating Frame Relaxometry at High and Ultra-High Magnetic Fields

Purpose: This work is based on the review of novel MRI methods for generating the longitudinal relaxation contrast, T1ρ, and the transverse relaxation contrast, T2ρ in the rotating reference frame regime at high and ultra-high magnetic fields. Clinical application of the T1ρ and T2ρ contrasts using the onor off-resonance spin-lock (SL) radiofrequency (RF) irradiation has been a challenging task...

Heat capacity of adsorbed Helium-3 at ultra-low temperatures

Ultra-high-field magnetic resonance imaging

Understanding human brain function, brain development and brain dysfunction is one of the great challenges of the twentyfirst century. Biomedical imaging has now run up against a number of technical constraints that are exposing limits to its potential. In order to overcome the current limits to high-field magnetic resonance cerebral imaging (MRI) and unleash its fullest potential, the CEA has ...