What is the difference between ‘high field’ NMR and ‘low field’ NMR?
Typical NMR/MRI (magnetic resonance imaging) analytical or/and imaging tools work at possibly higher magnetic field (which means higher frequency that is related to the magnetic field intensity via gyro-magnetic ratio of a nucleus). This is done in order to gain sensitivity and spatial resolution (sensitivity is roughly proportional to the second power of frequency). The frequency range for hydrogen is normally 20-200 MHz (imaging, high resolution spectroscopy). In the case of our MR-ML ™ Technology the frequency range is 1-5 MHz. We call it low field (frequency) just for unusually low field (frequency) range. Why do we use low field NMR? One reason is low cost, low weight etc implementation but still with sufficient sensitivity for proton relaxation measurement on the sample volumes typically used. Two more reasons are specific for porous media application characterization in rock formations. First, in order to support interpretation of NMR well logging data, the operating frequency o
