2. In the static magnetic field in the magnetic nucleus by the action of electromagnetic waves produced between the different energy levels of the *** vibration transmigration phenomenon that is the nuclear magnetic *** vibration.
3. By detecting the rays directly or indirectly emitted by radionuclides introduced into the human body, computer-assisted image reconstruction is carried out to localize and characterize the lesions. Called nuclear medicine imaging.
4. Through the piezoelectric transducer will be high-frequency electromagnetic vibration energy into mechanical vibration energy, as the sound source of the emission of supernatural waves; at the same time can also be converted to electromagnetic energy supernatural wave vibration energy, through the signal processing, can be completed by the reception of supernatural waves.
Disadvantages: 1. The scope of application is limited, mainly for the bone and joint system, and the radiation is large.
2. Susceptible to artifacts caused by metal and motion, imaging time is long.
3. For functional imaging, anatomical localization is unclear, and radiation is large.
4. Can recognize the limitations of the disease, easy to produce gas artifacts.