In addition, magnetic resonance imaging (MRI), which is often mentioned in people's daily life, is an imaging device for medical examination, which makes use of the phenomenon of nuclear magnetic resonance.
Hertz is the frequency unit in the international system of units, and it is a unit to measure the number of repetitions of periodic changes per second.
The nuclear magnetic resonance * * vibration is a physical process in which the spin energy level of the nucleus with non-zero magnetic moment splits Zeeman under the action of an external magnetic field, and the * * vibration absorbs a certain frequency of radio frequency radiation. Nuclear magnetic resonance spectrum is a branch of spectroscopy, its vibration frequency is in radio frequency band, and the corresponding transition is the transition of nuclear spin in nuclear Zeeman level.
Application of magnetic resonance imaging: Magnetic resonance imaging (MRI) has become a common image examination method. As a new imaging technology, MRI will not affect human health, but there are six groups of people who are not suitable for MRI: even those with pacemakers, those with or suspected metallic foreign bodies in their eyeballs, those with silver clip ligation of aneurysms, and those who are not suitable for MRI. No monitoring instruments, rescue equipment, etc. Enter the MRI room. In addition, pregnant women less than 3 months pregnant, it is best not to do magnetic resonance imaging.