Magnetic Resonance Angiography

Magnetic resonance angiography (MRA) is an examination method that uses electromagnetic waves to produce an image of a two-dimensional or three-dimensional structure of the body. Sometimes referred to as "nuclear magnetic resonance imaging (MRI)." It is a kind of tomographic imaging that uses electromagnetic resonance to obtain electromagnetic signals from the human body and reconstruct human body information. Depending on the condition, contrast agents may sometimes be injected intravenously through the hand or forearm to improve image quality. Basic Information Specialist Category: Inspection Category: Nuclear Magnetic Resonance Applicable gender: whether men and women apply fasting: fasting Tips: It is forbidden to eat 4-6 hours before the inspection (except in special circumstances). Normal value The gray-scale feature of the magnetic resonance image is that the stronger the magnetic resonance signal, the greater the brightness, and the weaker the magnetic resonance signal, the brightness is also small, from white, gray to black. The gray scale characteristics of various tissue magnetic resonance images are as follows; adipose tissue, cancellous bone is white; cerebrospinal and bone marrow are white-gray; viscera and muscle are grayish white; liquid, normal velocity, blood is black; cortical bone, gas, gas The lungs are black. Clinical significance adapt: 1, neurological diseases, cerebral infarction, brain tumors, inflammation, degenerative diseases, congenital malformations, trauma, etc., for the application of the earliest human system, has accumulated a wealth of experience, the location and qualitative diagnosis of lesions is more accurate and timely, can be found Early lesions. 2, the cardiovascular system can be used for the diagnosis of heart disease, cardiomyopathy, pericardial tumor, pericardial effusion and wall thrombus, peeling of the inner membrane. 3, chest lesions in the mediastinum mass, lymph nodes and pleural lesions, etc., can show the relationship between the lung mass and the larger trachea and blood vessels. 4. Diagnosis and differential diagnosis of abdominal organ liver cancer, hepatic hemangioma and hepatic cyst, diagnosis and differential diagnosis of intra-abdominal mass, especially retroperitoneal lesions. 5, pelvic organs; uterine fibroids, other tumors of the uterus, ovarian tumors, qualitative positioning of the pelvic mass, tumors of the rectum, prostate and bladder. 6, bone and joint intra-bone infection, tumor, trauma diagnosis and lesion range, especially for some minor changes such as bone contusion, etc., intra-articular cartilage, ligament, meniscus, synovium, synovial sac and other diseases And bone marrow lesions have a higher diagnostic value. 7, systemic soft tissue lesions whether from the nerves, blood vessels, lymphatic vessels, muscles, connective tissue tumors, infections, degenerative lesions, etc., can make a more accurate positioning, qualitative diagnosis. Precautions Before the test: Do not eat for 4-6 hours before the test (except in special cases). Inspection process First, the technician will metal objects on the patient such as dentures, necklaces, rings, and the like. Sometimes the medical staff will give the patient some sedatives to keep the patient at rest during the examination. The patient lies flat on the examination bed. The bed moves slowly into a centrally open electromagnetic field generator. This electromagnetic field is harmless to the human body and painless. During the examination, the doctor can talk to the patient through the microphone and speaker installed in the examination room. Depending on the condition, contrast agents may sometimes be injected intravenously through the hand or forearm to improve image quality. MRA examinations typically last 30-60 minutes. Not suitable for the crowd Not suitable for the crowd: pregnant, extremely anxious, excited people. And weighing more than 150 kg, the body is equipped with pacemakers or other metal objects, such as artificial joints, prosthetic valves, screws or metal clips. A life support device such as oxygen is required. Adverse reactions and risks Nothing.