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The basic principles of magnetic resonance imaging technology
Pigeon lovers all know that if the pigeon flies to hundreds of kilometers away, they will be automatically back home. Why do pigeons have good skills of recognizing home?
It has turned out that the pigeons are very sensitive to the Earth's magnetic field, they can take advantage of changes in the Earth's magnetic field to find their own home. If we tie a magnet on the pigeon's head, the pigeons will get lost. If the pigeon flies over the radio tower, strong electromagnetic interference may also cause them to become disoriented.
In medicine, the use of magnetic resonance imaging can diagnose the abnormal tissue of the body and determine disease. This is the nuclear magnetic resonance imaging technology that we are more familiar with. According to magnetic products factory, the basic principle is as follows:
Nucleus has positive electricity, and spin motions. Under normal circumstances, the arrangement of the nuclear spin axis is erratic. But if it is placed in external magnetic field, the nuclear spin orientation in space will transit from disorderly to orderly. Magnetization vector of the spin system will increase gradually from zero. When the system reaches an equilibrium, the magnetization reaches a stable value.
from：http://www.htmagnets.com/newsd-nid-20.html
