1、 The definition of MRI: Magnetic Resonance Imaging (MRI) is a medical imaging technique that uses powerful magnetic fields and radio waves to generate detailed images for doctors to understand the internal organs, tissues, and bones of the human body. Magnetic resonance is the abbreviation of nuclear magnetic resonance, and its imaging principle is to generate images using electromagnetic waves generated by magnetic fields and radio waves in human tissues. Compared with traditional examination methods such as X-rays and CT, magnetic resonance imaging has significant advantages in soft tissue resolution, and therefore has important value in the classification and qualitative judgment of many diseases.
2、 Attention should be paid to the following matters during magnetic resonance examination:
1. For those with magnetic substances in the body, such as pacemakers, artificial valves, and residual metal foreign objects near important organs, this examination cannot be performed. However, for those with implants confirmed by the surgeon as non-magnetic objects, magnetic resonance examination can be performed.
2. Explain the following situation to the technical personnel: whether there is a history of surgery; Is there any metal or magnetic substance implanted in the body, including metal contraceptive rings; Whether there are dentures, electronic ears, artificial eyes, etc; Whether there is any drug allergy; Is there any metallic foreign object splashing into the body.
3. Do not wear underwear with metallic substances. Patients undergoing head and neck examinations should wash their hair the day before the examination and avoid using any hair care products.
Before the examination, all clothes except for underwear should be removed and replaced with specialized clothes for the MRI room examination. Remove metal items worn such as necklaces, earrings, watches, and rings. Remove cosmetics, dentures, artificial eyes, glasses, and other items from the face.
5. Before the examination, provide the doctor with all medical history, examination materials, and all X-rays, CT scans, previous magnetic resonance images, etc.
6. Abdominal (liver, spleen, kidney, pancreas, biliary tract, ureter, etc.) examination personnel should fast for 4 hours before examination and inject 654-2 before examination.
In addition, it is important to pay attention to the physical condition during magnetic resonance imaging (MRI) examination and avoid vigorous exercise to avoid affecting the accuracy of the results. If discomfort or any other abnormal situation occurs during the examination, the examination should be stopped immediately and communication with the doctor should be made. After completing magnetic resonance imaging, it is advisable to avoid prolonged exposure to strong magnetic fields to prevent adverse effects on the body. At the same time, it is necessary to pay attention to the physical condition and seek medical attention promptly if any discomfort occurs. Collect the examination report within the agreed time and ask the doctor to interpret the results in order to understand your physical condition. According to the examination results, follow the doctor's advice and receive appropriate treatment or further examination.
3、 MRI has the following advantages in brain diagnosis:
1. No radiation damage: Unlike CT scans, magnetic resonance imaging does not use X-rays, so it does not cause radiation damage and reduces the risk of radiation exposure for patients.
2. No bone artifacts: Magnetic resonance imaging is not affected by bone structure, so there will be no artifacts caused by bone structure in brain examination, which improves the clarity and accuracy of the image.
3. Multi dimensional and multi parameter imaging: Magnetic resonance imaging can obtain images from multiple levels, and by adjusting the magnetic field and radio frequency pulse parameters, different image contrasts can be obtained to better display brain structures.
4. High soft tissue resolution: Magnetic resonance imaging has extremely high soft tissue resolution, which can clearly display subtle structures such as gray matter and white matter, helping to accurately assess the location and extent of lesions.
5. No need to use contrast agents to display vascular structures: Magnetic resonance imaging can utilize hemodynamic effects to display vascular structures without the need for contrast agents, which is of great significance for the diagnosis of cerebral vascular diseases.
6. The display of cranial, spinal, and spinal cord diseases is superior to CT: Magnetic resonance imaging can better display the fine structure and lesions of cranial, spinal, and spinal cord diseases, which helps to detect and evaluate the degree of lesions early.
7. No need for angiography: Magnetic resonance imaging can evaluate cerebral vascular conditions in a non-invasive manner, without the need for angiography, reducing patient pain and risk.
Magnetic resonance imaging is almost applicable to the examination of different diseases in various systems throughout the body, such as tumors, inflammation, trauma, degenerative diseases, and various congenital diseases. In the diagnosis of brain diseases, magnetic resonance imaging has the unique advantages mentioned above, and different scanning sequences and imaging methods can be selected according to different disease types and examination needs to achieve the best diagnostic results.
In summary, magnetic resonance imaging has multiple advantages in brain diagnosis, including no radiation damage, no bone artifacts, multi-faceted and multi parameter imaging, high soft tissue resolution, and so on. These advantages make magnetic resonance imaging more accurate and reliable in the diagnosis of brain diseases, providing clinical doctors with more detailed and accurate diagnostic basis. Meanwhile, with the continuous development and advancement of technology, the imaging speed of magnetic resonance imaging has also been greatly improved, shortening scanning time, increasing patient comfort and diagnostic efficiency. Therefore, magnetic resonance imaging has become an irreplaceable and important diagnostic method for brain diseases.