Basic Knowledge and Indications of Nuclear Magnetic Resonance NMR
What is an NMRscan? NMR is a widely used examination method nowadays, and many diseases require NMR examination. Here, it is better to summarize the indications of MRI for everyone.
Common sense of MRI
Magnetic Resonance (MRI) is also known as Magnetic Resonance Imaging. It is another major advancement in medical imaging after CT. Since its application in the 1980s, it has developed at an extremely fast rate. The basic principle is that the human body is placed in a special magnetic field, and the hydrogen atomic nucleus in the human body is excited by radio frequency pulses, causing the hydrogen atomic nucleus to resonate and absorb energy. After the radio frequency pulse is stopped, the hydrogen nuclei emit radio signals at a specific frequency and release the absorbed energy, which is recorded by the receiver outside the body and processed by an electronic computer to obtain an image, which is called nuclear magnetic resonance imaging.
Nuclear magnetic resonance is a physical phenomenon. As an analytical method, it is widely used in physics, chemical biology and other fields. It was not used in medical clinical testing until 1973. To avoid confusion with radiological imaging in nuclear medicine, it is called magnetic resonance imaging (MRI). MRI is a biological magnetic spin imaging technology. It uses the characteristics of nuclear spin motion. In an external magnetic field, it generates a signal after being excited by radio frequency pulses. It is detected by a detector and input to a computer, and the image is displayed on the screen after processing and conversion. .
Next, let’s look at the indications for MRI NMR.
Indications for MRI NMR
Nervous system lesions: cerebral infarction, brain tumor, inflammation, degenerative diseases, congenital malformations, trauma, etc. In order to apply the earliest human body system, we have accumulated rich experience, and the localization and qualitative diagnosis of lesions are more accurate and timely, and early detection can be made disease.
Cardiovascular system: It can be used for the diagnosis of heart disease, cardiomyopathy, pericardial tumor, pericardial effusion, mural thrombus, and intimal stripping.
Thoracic lesions: Masses in the mediastinum, lymph nodes, and pleural lesions, etc., can show the relationship between the mass in the lung and the larger trachea and blood vessels.
Abdominal organs: Diagnosis and differential diagnosis of liver cancer, hepatic hemangioma and hepatic cyst, diagnosis and differential diagnosis of intra-abdominal masses, especially retroperitoneal lesions.
Pelvic organs; uterine fibroids, other uterine tumors, ovarian tumors, qualitative localization of pelvic masses, rectal, prostate and bladder tumors, etc.
Bone and joints: Diagnosis and range of lesions of intraosseous infection, tumor and trauma, especially for some subtle changes such as bone contusion, etc. Bone marrow lesions have high diagnostic value.
Systemic soft tissue lesions: Whether derived from nerves, blood vessels, lymphatic vessels, muscles, connective tissue tumors, infections, degenerative lesions, etc., more accurate positioning and qualitative diagnosis can be made.
From this point of view, MRI examination is an irreplaceable examination item.
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