In the outpatient clinic, according to the needs of the disease, the doctor advises the patient to undergo cerebrovascular ultrasound and then undergo cerebromagnetic magnetic field. Many patients don’t understand what’s going on, why do brain MRI need to be done after cerebrovascular ultrasound? Can’t it be done in one step? Some patients may think that the doctor deliberately prescribes more examination items for the benefit of the hospital. In fact, this is not the case. Most doctors consider the patient's disease.
What is the difference between cerebrovascular ultrasound and cerebral nuclear magnetic field?
1. The examination methods are different, and the cerebral nuclear magnetic field charges are higher than ultrasound.
Cerebrovascular ultrasound and brain magnetic field have different examination methods, and are not heavyweight examination methods.
Vascular ultrasound is a non-invasive examination. It is relatively simple, can be repeated, and is relatively economical. Generally, it is determined whether there are lesions in the intracranial blood vessels, such as measuring the blood flow velocity, blood flow direction, and blood vessel wall elasticity of the blood vessels, and determining whether there is a possibility of stenosis or blockage in the blood vessels.
Nuclear magnetism mainly uses magnetic fields, effects, etc. to see the substantial and space-occupying lesions of our intracranial brain. For example, if ischemia occurs, the ischemic lesions can be seen; if cerebral hemorrhage is found, is found, cerebral hemorrhage can be clearly visible. The charge for NMW is higher than that for ultrasound.
2. Brain magnetic examination is relatively complex
3. Different imaging principles:
The principle of cerebrovascular ultrasound is different from the principle of magnetic resonance imaging. Cerebrovascular ultrasound uses the principle of acoustic imaging. Magnetic resonance uses the principle of hydrogen proton motion imaging, and the imaging clarity is better.
4. The limiting factors are different:
Ultrasound is limited by whether the cranial suture is closed. Magnetic resonance is not limited by the skull suture, but by metal materials. Patients using artificial heart valves, pacemaker , cardiac vascular stents, etc. cannot undergo magnetic resonance examination .
Whether a cerebrovascular ultrasound is required to undergo cerebrovascular ultrasound, whether a cerebromagnetic examination is mainly based on the patient's symptoms and signs, the doctor recommends that the patient do ultrasound or magnetic pulse, or both based on the patient's symptoms and signs. Doctors generally recommend that patients undergo simple ultrasound screening first. After that, they are suspected of related lesions, and only those who are recommended to undergo cerebral magnetic field are suspected to be caused by ischemia when ultrasound sees stenosis of the central cerebral artery. Do nucleus to see if there is a lesion. Combining ultrasound and nuclear magnetic field can confirm the cause, location and degree of the disease, making it easier for doctors to formulate treatment plans.
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