What can brain MRI check?

Mainly to check whether there are organic lesions. The nature of the lesion can be determined by the organic brain injury of the slow brain. However, brain nerve dysfunction is divided into functional and organic. If it is found to be organic, it is difficult to cure it fundamentally. Different functions. After correct treatment, it can still recover or be close to recovery.

Recently, more and more people use magnetic resonance imaging (MRI) without ionizing radiation for health examination. What exactly is an MRI? What diseases can it detect? Nuclear magnetic resonance photography is represented by a magnetic core, which is either radiation (that is, non-ionizing radiation, that is, radiation that does not dissociate molecules in the body and is harmless to the human body), or a heavy and large magnet is placed in the nuclear magnetic resonance camera, which vaguely but powerfully emits a force equivalent to tens of thousands of times the earth's magnetic field (generally used for clinical nuclear magnetic resonance photography, its magnetic field is 30,000 times that of the earth). Magnetic resonance photography (MRI) is often used to examine various parts and organs of the body, and can be applied to every part of the whole body from head to toe. It can use imaging technology to check whether there is any structure or abnormal blood flow, can see through the patient's body and do detailed scanning, and even can clearly see the fetus in the mother's abdomen. However, the technology applied to breast examination is still in its infancy.

Magnetic resonance photography can clearly see the amount of soft tissue and water in the body, which is different from X-ray examination and computed tomography. Magnetic resonance photography can show the outermost skin and well-defined structures of the nerves in the spine, but in the images of computed tomography, these structures, such as muscle, bone, nerve tissue, fat and water, are indistinguishable. MRI can also clearly show the intervertebral disc and nerve roots between the bones of the spine and the pathological relationship between them, which can provide correct diagnosis. Acoustic neuroma grows between bone and brain tissue, which can be clearly displayed by MRI. If computed tomography is used, it is not easy to see the lesion and its surrounding tissues. In addition, some tumors have metastasized from carcinoma in situ, and it is easier to find early metastasis by magnetic resonance imaging. Magnetic resonance imaging can also find many unexplained brain problems, such as abnormal cerebral cortex development or myelin sheath lesions at the end of the brain in patients with multiple sclerosis.

The invention of magnetic resonance photography is a great progress in medicine. Many tumors or lesions that cannot or are not easily found by X-ray and computed tomography are displayed under magnetic resonance photography, which enables doctors to treat the real causes more effectively. Compared with computed tomography, magnetic resonance photography has increased a lot in sensitivity and accuracy, and the image clarity is 20 times that of computed tomography.

How to take magnetic resonance photography? Just lying in a tunnel-like instrument feels like boarding a space capsule. As the inspection goes on, the instrument will make noise similar to that of the earth boring machine. Then, the patient can close his eyes and carry out this non-invasive examination with a relaxed mood.

So when should I do MRI photography? Doctors will judge when to do MRI according to the clinical symptoms of patients. Not every case needs MRI, only when X-rays, ultrasound and computed tomography are useless.

The large magnet for nuclear magnetic resonance photography is placed in a tunnel with a width of about 50~60 cm and a length of 1 meter. The magnetic field it sends out will affect the protons in the hydrogen nucleus in the patient's body, so that protons with different rotation directions will rotate in the same direction obediently. Once the protons are arranged in sequence, electromagnetic waves are applied from the outside to make them resonate with the protons in the body. When the applied electromagnetic waves stop, the human body will release electric waves. The degree of "discharge" of tissues in different parts will be different, so the image signals presented will be different. The magnitude of the magnetic field is calculated in Tesla (t). The bigger the magnetic field, the stronger the signal, and the more subtle changes in the body can be seen. At present, the magnetic resonance used in clinical diagnosis is mostly 1.5T, while the magnetic resonance used in research is more than 3T, and the magnet.

Because the magnetic field of nuclear magnetic resonance photography is 30 thousand times that of the earth, it has super magnetic force, just like a super magnet. Therefore, for the sake of safety, in addition to avoiding bringing metal into the magnetic field, as long as there are metal objects in the body, such as pacemakers, brain metal clips, steel nails left in the body during fracture surgery, or people with iron filings in their eyes, don't accept MRI photography. In addition, women should also avoid MRI in the early pregnancy.

Although magnetic resonance imaging can detect many pathological conditions inside the body, it still has its limitations. For example, MRI can't be used for bone examination because the bones are dark in the film. If you want to see bone calcification or bone fragments caused by trauma, you still need to check it with computed tomography. However, sometimes you can take advantage of this shortcoming, for example, the bone part is black, because it does not display the signal, so once the signal is displayed, it means that it is abnormal and there is something wrong with the bone. For example, detecting common spinal metastasis of lung cancer depends on this characteristic of MRI.

At present, nuclear magnetic resonance photography is still improving. In addition to strengthening its function, it is also developing in the direction of making patients feel comfortable, such as increasing the width of the tunnel to avoid atresia phobia, or reducing noise, or allowing patients to listen to music or watch movies during examination. In addition, because the three tools of medical imaging, CT scanner, magnetic resonance imaging (MRI) and positron emission tomography (PET), have their own advantages; Computed tomography and nuclear magnetic resonance photography mainly look at structural abnormalities, while positron emission tomography is to check functional abnormalities. Therefore, scientists try to combine these advantages.