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Magnetic Resonance Imaging (MRI) is a widely used medical imaging technology in clinical practice, which can obtain detailed information about the internal structure of the human body without damage. However, many people have doubts about whether radiation is involved in MRIs, which not only affects patients' acceptance of MRI examinations, but may also affect people's trust in medical advice. Here, we'll dive into how MRI technology works, and whether it involves radiation, as well as break down three key points to look out for before the exam.
How MRI works.
MRI uses a strong magnetic field and radio frequency pulses to generate signals from inside the human body to produce detailed two- or three-dimensional images. This process does not involve any radioactive material, so MRI imaging itself does not produce radiation. In contrast, traditional X-ray imaging techniques use X-rays to penetrate an object and image it based on how well the object absorbs the rays, a process that produces radiation.
Radiation issues with MRI.
Although MRI does not use radioactive material, it produces an effect known as "magnetic field-induced microscopic vibrations" during imaging. This effect is due to the excitation of hydrogen atoms in water molecules by radio frequency pulses, resulting in tiny vibrations of the hydrogen atoms in an applied magnetic field. Although this vibration is safe for human tissue, it is controversial in physics whether it can be called "radiation". Importantly, to date, there is no scientific evidence that this effect of MRI poses a risk to human health.
There are three key points to note before the examination.
1.Exclusion of metal items from the patient's body: MRI uses a strong magnetic field, so the patient must remove all metal items from the body, including rings, earrings, dentures, braces, etc., before undergoing the MRI examination. Not only do these metal objects move in a magnetic field, causing discomfort or injury to the patient, but they can also affect the quality of the image.
2.Notification of magnetic field-sensitive devices: Patients must inform their doctor if they have electronic devices such as pacemakers implanted in their bodies, as these devices are very sensitive to magnetic fields and may be affected by MRI magnetic fields. In this case, the doctor will assess whether an MRI is possible or take appropriate safety measures.
3.Precautions for special populations: Pregnant women and children need special attention when undergoing MRI examinations. Pregnant women should not undergo MRI until their doctor has assessed the potential risks, while children need to be more cautious due to the development of the head and brain. Your doctor will decide whether an MRI is appropriate on a case-by-case basis.
Characteristics of the associated disease are associated with**.
Before discussing the use of MRI in disease diagnosis, we will briefly describe the characteristics of several common diseases.
Stroke: A stroke is damage to brain tissue caused by a sudden rupture or blockage of a blood vessel in the brain. MRI can clearly show the condition of blood vessels and brain tissue in the brain, which is of high value in the diagnosis and evaluation of stroke.
Tumors: MRI provides information about the location, size, morphology, and relationship of the tumor to surrounding tissues, which is essential for the diagnosis and staging of the tumor.
Arthritis: MRI can clearly show the condition of articular cartilage and ligaments, which is an important reference for the diagnosis and severity of arthritis.
In terms of **, Chinese medicine and Western medicine have different concepts and methods. Traditional Chinese medicine focuses on the overall tone.
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