Is there any radiation during magnetic resonance imaging? I never expected this answer-瞭望新时代网

Is there any radiation during magnetic resonance imaging? I never expected this answer

2024-09-03

Some friends, upon hearing the phrase 'make a movie', wish they could escape at lightning speed, but seeking medical treatment is like fighting a monster. They cannot distinguish between humans and monsters, nor can they shout and kill them. The imaging instrument is Sun Wukong's fiery and golden eyes, which can identify diseases and abnormalities in the body and drive away the "demons and monsters" on the road to health. Not all tests that require filming involve radiation. Today, I will introduce to you this zero radiation artifact magnetic resonance examination. What is magnetic resonance examination? Magnetic resonance imaging, abbreviated as MRI, can clearly display the internal structures of the body such as bones, muscles, joints, blood vessels, and internal organs, and plays a very important role in diagnosing various diseases. For example, doctors can use magnetic resonance imaging to detect brain tumors or spinal injuries. But some friends are scared when they see this examination, magnetic resonance imaging, which sounds like there is radiation. never mind! Magnetic resonance imaging does not emit radiation! Magnetic resonance imaging, in layman's terms, is the process of applying a strong magnetic field to the body, arranging atomic nuclei (approximately 70% of our body is water, which contains many hydrogen nuclei) in an orderly manner towards the direction of the magnetic field. Then, specific frequency electromagnetic waves are used for excitation, capturing the energy released by the atomic nuclei when they return to their original state, forming an MRI signal. Magnetic resonance imaging can be imagined as a '3D eye', allowing doctors to see a clear three-dimensional view of the internal tissues of the body from different angles. Why do we sometimes have to do an MRI after completing a CT scan? CT and magnetic resonance imaging are not opposed, but complementary. Sometimes even after undergoing a CT scan, doctors may still need to use magnetic resonance imaging to obtain more detailed information. Especially when diagnosing neurological diseases such as cerebral infarction, brain tumors, intracranial infections, aneurysms, multiple sclerosis, etc; And in cases of soft tissue muscle diseases, such as muscle injuries, ligament ruptures, tendinitis, etc. In addition, for certain special lesions, magnetic resonance imaging can provide clearer images, which helps with more accurate diagnosis and treatment planning. Since magnetic resonance imaging has no radiation and strong resolution, it is particularly accurate for the diagnosis of brain, spinal cord, pelvic organs, cardiovascular disease, and myocardial infarction. So, wouldn't it be better to choose to undergo magnetic resonance imaging directly? NO NO NO！ Magnetic resonance imaging is not something you can do if you want to. For example, the following individuals are not eligible for magnetic resonance imaging: 1. People with electronic devices such as cochlear implants, pacemakers (excluding compatible pacemakers), insulin pumps, etc. installed in their bodies. 2、 People with ferromagnetic vascular clips, steel nails, steel plates, or other unknown metal foreign objects in their bodies. 3、 Individuals with magnetic metal implants in their eyeballs. 4、 People with a history of moderate to severe allergic reactions to contrast agents and renal dysfunction. In addition, some patients undergoing magnetic resonance imaging (MRI) may pose safety risks and require a comprehensive evaluation by a doctor to determine whether MRI is necessary: 1. If there are ferromagnetic objects in the patient's body or examination area. 2、 Metal dentures may cause image artifacts during nasopharyngeal or oral examinations. 3、 During pelvic examination, metal contraceptive devices may cause image distortion. 4、 For patients with claustrophobia, family members may need to accompany them. 5、 Patients with unclear consciousness, severe hypoxia, or restlessness need to stabilize their condition before they can safely undergo magnetic resonance imaging examination. 6、 Pregnant patients need 3 months to undergo magnetic resonance imaging examination. Doctors will choose the most suitable examination method based on the patient's specific condition and diagnostic needs. In short, what kind of examination to do depends on the doctor's words. What are the precautions for magnetic resonance imaging? Before the MRI examination, it is necessary to remove all metal objects from the body, such as mobile phones, watches, bank cards, ID cards, keys, lighters, necklaces, earrings, coins, etc. And pacemakers (excluding compatible pacemakers), stents made of unknown materials, steel needles and plates cannot enter the examination room. During the examination, magnetic resonance imaging (MRI) scans a specific area for about ten minutes. Due to the operation of the equipment, there may be significant noise and a high level of patient cooperation is required. At the beginning of the scan, movement is not allowed. If you undergo an enhanced MRI examination (injected with contrast agent) after the examination, you may need to observe in the observation room for about 15-20 minutes to ensure that there are no discomfort reactions. (New Society)

Edit：HAN ZHUOLING Responsible editor：CAICAI

Source：gmw.com

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