Any electrical resistance generates thermal noise called Johnson Noise. This noise is also generated by the human body as a consequence of the ionic nature of body tissue and fluids, all active electronic devices (e.g. transistors) generate noise and noise is transmitted through the ether (radio-signals, interference from electrical equipment, extraterrestrial etc.).

Motion, which is uniform in all directions. This is generally used in reference to molecular diffusion or rotation, which gives rise to relaxation of the spin system through the dipole dipole interaction.

From Siemens Medical Systems;
Received FDA clearance in 2012.
The MAGNETOM Spectra is a cost-optimized high field MRI system with Tim 4G and Dot technologies. The system consumes less energy compared to other 3 Tesla scanners. The magnet-cooling helium is contained in a closed loop, which prevents the gas from escaping and reduces the need for refills. TimTX includes innovative techniques in the radio frequency excitation hardware as well as new application and processing features enabling uniform RF distribution in all body regions.

This type of physiologically controlled imaging suppresses pulsation and flow artifacts. The pulse wave obtained with a finger sensor with a finger sensor is used as the trigger. Pulse sensors are more comfortable to use than ECG electrodes, but less precise.

Methods of selectively enhancing or suppressing the signal from a particular molecular substance by using its spin properties, typically through spin spin coupling, e.g. J-modulation.