1, because nuclear magnetic vibration is magnetic field imaging, not X-ray, and it is not radioactive, so it is harmless to human body and very safe. So far, there has been no international report on the harm caused by the use of MRI vibrators in hospitals, and the incidence of gene mutation or chromosome aberration in patients has not been found to increase.
2. Magnetic resonance imaging is an examination method for image analysis and diagnosis of human cross section by using electronic computer. It doesn't use x-rays, but magnetic fields. Its basic principle is that the hydrogen atoms contained in human body will vibrate when given a specific high wave under a strong magnetic field, resulting in electromagnetic waves with high wave number. Taking advantage of this feature, nuclear magnetic resonance (NMR) uses electronic computers to collect, process and map the changes of magnetic fields.
3. Magnetic resonance imaging can show fat, whole body organs, muscles, fast-flowing blood, bones and air. The internal structure of organs can also be clearly displayed. Doctors can well identify tumors, inflammation, necrotic lesions, abnormal substance deposition, dysfunction, blood circulation obstruction and other diseases in patients. It is of great help to the diagnosis of various diseases of nervous system, chest, abdomen and limbs.
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Extended data
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.
Because nuclear magnetic resonance is magnetic field imaging, there is no radioactivity, so it is harmless to human body and very safe. It is understood that at present, there is no report on the harm caused by nuclear magnetic resonance examination in the world, and there is no phenomenon that the incidence of gene mutation or chromosome aberration increases due to nuclear magnetic resonance examination.
Although MRI is unique in screening early lesions, any examination is limited. For example, some patients are not suitable for MRI, so don't overdo it. He appealed that any patient should be examined according to the doctor's advice. Don't think that the more expensive the image examination, the better. Only the exam that suits him is the best.
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