Magnetic Resonance Imaging

The working principle of magnetic resonance imaging (MRI) is to place the human body in a special magnetic field, excite hydrogen nuclei in the human body with radio frequency pulses, cause hydrogen nucleus resonance, and absorb energy. After stopping the radio frequency pulse, the hydrogen nucleus emits a radio signal at a specific frequency and releases the absorbed energy, which is collected by an external receiver and processed by an electronic computer to obtain an image. This process is called nuclear magnetic resonance imaging. Magnetic resonance imaging instruments are of great significance for the imaging diagnosis of various major diseases such as cardiovascular, cerebrovascular, neurological, and tumor diseases. The nuclear magnetic resonance instrument independently developed by China has been successfully developed and mass produced in Shenzhen Advanced Technology Research Institute of the Chinese Academy of Sciences, breaking through the long-term blockade of this technology abroad.

The unit is designed for unsupervised public use: controls are recessed or shielded, moving parts are enclosed, and the interface is operable by a child of about six with no instruction. Where a screen is used, the language can be switched without changing the hardware, and the content can be replaced on site.

The physical principle of nuclear magnetic resonance phenomenon: ① Magnetizing the human body: The human body contains a large amount of water, so there is a large amount of hydrogen (hydrogen nuclei). By using strong magnetism, hydrogen nuclei in the human body are arranged in an orderly manner along the direction of the magnetic field. ② Excitation resonance: When a radio frequency signal is emitted towards the hydrogen nucleus, its direction will flip and stop emitting new signals, causing the hydrogen nucleus to return to its initial state. The principle of interaction between atomic nuclei, magnetic fields, and external radio frequency fields. ③ This resonance signal is converted into an image through digital circuit analysis and intelligent algorithms.