Currently, with the continuous development of medical technology, various imaging examinations are also widely used in clinical practice, such as CT, B-ultrasound and magnetic resonance. There are taboos before various imaging examinations, such as nuclear magnetic resonance. Nuclear magnetic resonance is used to know the physical condition through magnetic field scanning. Because it does not have radiation, it is very popular among patients and is also widely used in clinical practice because of its accuracy. There are also many people who think that physical discomfort symptoms will not have any effect, such as fever, which is not the case.
Why can’t I have a fever do MRI?
Because the nuclear magnetic resonance is stimulated by the radio frequency pulse during scanning, the body will have a thermal effect. Because the body is a conductor with bioresistance, the radio frequency pulse has a certain amount of energy during the nuclear magnetic resonance scanning imaging. After being continuously excited and absorbed by the body, it will be converted into ohmic heat, causing the tissue temperature to continue to rise.
Patients with fever are increasing their calories and their heat dissipation function is weakening. Performing a nuclear magnetic resonance scan will lead to further increase in body temperature. It may even cause other symptoms due to increased body temperature. Therefore, it is not recommended for patients with fever to undergo MRI. If MRI is required due to the condition, the body temperature should be controlled at around 38℃ and it is prohibited to exceed 38.5℃. Because in the body temperature level of nuclear magnetic resonance, 38.5℃ is a moderate heat fever, and nuclear magnetic resonance is prohibited.
What situations cannot be performed for NMR?
1. Clausphobia
Because the MRI will be tested in a completely closed environment, claustrophobia patients are prone to illness in this environment, damaging the instrument and harming themselves. Therefore, if you suffer from claustrophobia, you are prohibited from undergoing MRI. If you need it due to the disease, you should take an anesthesia under the guidance of a doctor and do a check in a calm state.
2. Have tattoos on the body
Because most of the dyes used for tattoos are chemical substances, these chemical substances will react and burn the skin when scanning.
3, children
Because of their strong curiosity and their inability to sit still, doing MRI can easily hurt themselves and damage the instrument. Or patients who are mentally unstable and cannot be quiet cannot undergo MRI to avoid accidents.
Warm reminder that people with MRI should understand clearly. In addition, be careful to remove the metal objects worn by the body before undergoing an MRI examination. Metal items will react with the magnetic field, which will affect the inspection results. Therefore, it is prohibited to wear it. If there is a dental implant in the mouth and a metal implant in the body, you need to inform the doctor in advance and ask the doctor to conduct an evaluation to see if you can do an MRI to prevent accidents and cause physical injury.
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