Magnetic Resonance Relaxometry at Low and Ultra low 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...

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...

Magnetic Trapping of Bacteria at Low Magnetic Fields

A suspension of non-magnetic entities in a ferrofluid is referred to as an inverse ferrofluid. Current research to trap non-magnetic entities in an inverse ferrofluid focuses on using large permanent magnets to generate high magnetic field gradients, which seriously limits Lab-on-a-Chip applications. On the other hand, in this work, trapping of non-magnetic entities, e.g., bacteria in a uniform...

Magnetic Resonance Imaging Techniques for Physiological Contrast Visualization at Ultra-High Magnetic Fields

High-Resolution, Low-SAR T2 Imaging at High Magnetic Fields

The PSIF (gradient-reversed FISP, SSFP, CE-FAST) sequence is demonstrated to produce high-quality, T,-weighted images in human brain at magnetic field strengths of 4 Tesla and above In contrast to spin-echo or multiple-echo imaging techniques commonly used in clinical practice at lower fields, the importance of Bi homogeneity in PSIF imaging is minimal and the average RF power deposition is low...