nuclear magnetic resonance is helpful in the diagnosis of various diseases. Using the principle of nuclear magnetic resonance, the energy released by attenuates differently in different structures inside the object and in the environment, and can be drawn as a structural image of the object. However, many people are afraid to do MRI scans casually because they feel that this examination will bring a lot of radiation to the body and cause health problems. What exactly is going on?
If you suspect that you have a health problem, but you don’t know what the disease is, you need to go to the hospital for a detailed examination, which may involve MRI . However, MRI itself does not cause radiation damage to the body. The reason why many people have misunderstandings is that they do not understand the principle and essence of the examination.
adds radio frequency pulses of different frequencies during the examination. Radio frequency pulses with the same frequency as the body will produce resonance signals, which are accepted and processed by the computer to obtain image data to understand the internal situation.
Can still undergo MRI after installing the cardiac stent?
Some people have severe heart disease. The blood vessels around the heart are blocked and narrowed , and the circulation cannot be maintained normally. Often, the heart will be ischemic and hypoxic, which will cause various adverse symptoms and require treatment for the disease. Some patients need to place a heart stent to reopen the blocked channel so that blood can be supplied to the heart.
However, whether an MRI can be performed after a cardiac stent is installed must be considered based on the actual situation. Most coronary stents are made of stainless steel or nickel-titanium alloy . A small number may contain other substances, mostly weakly magnetic or non-ferromagnetic. This means that most patients can safely and safely undergo MRI examinations.
But you must know in advance whether the device placed in your body has metal elements If a metal bracket is installed, you cannot perform this inspection .
What situations are necessary?
1. If you suspect that there is a liver disease occupying space in the liver
, you should choose appropriate examination methods according to the type of suspicion, including ordinary blood routine examination , liver B-ultrasound, liver color ultrasound etc.
However, if there is liver space occupying , you can first conduct imaging examination and use MRI results to assist the diagnosis. Subsequent liver-specific contrast examinations will also be used to make a qualitative diagnosis.
2. Suspected stroke
Many cases require MRI results, such as suspected acute stroke . During the development of stroke, the brain is in a state of ischemia or hemorrhage, which is relatively dangerous. It is necessary to understand the scope and severity of brain lesions.
The results can be obtained based on the MRI examination, especially those who have already sent signals from their bodies, and those who are already excessively obese, elderly, or have chronic diseases are suspected of having brain disease. This examination should be done as soon as possible, so that the disease can be discovered in time and reasonable treatment measures can be taken.
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