However, there are six groups of people who are not suitable for MRI examination, that is, those who have pacemakers, those who have or are suspected of having metal foreign bodies in their eyeballs, those who have silver clip ligation of aneurysms, those who have metal foreign bodies or metal prostheses in their bodies, critically ill patients with life-threatening and claustrophobic patients. 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.
Extended data:
Magnetic resonance imaging (MRI), also known as magnetic resonance imaging, is another great progress in medical imaging after CT. Since the application of1980s, it has developed at an extremely fast speed.
Nuclear magnetic resonance (NMR) vibration is a physical phenomenon. As an analytical method, it is widely used in physics, chemical biology and other fields. It was not used for medical clinical examination until 1973.
The basic principle is that the human body is placed in a special magnetic field, and the hydrogen nucleus in the human body is excited by radio frequency pulses, so that the hydrogen nucleus vibrates and absorbs energy. After stopping the radio frequency pulse, the hydrogen nucleus sends out a radio signal at a specific frequency, and releases the absorbed energy, which is collected by a receiver in vitro and processed by an electronic computer to obtain an image, which is called nuclear magnetic resonance imaging.
Baidu encyclopedia-nuclear magnetic resonance
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