Types of brain scans:
Computer tomography , CT :
Modern brain scan was started with CT. This technique uses X-rays which are reflected by brain tissues and indicates the density of the tissues. For a conclusive result in images are using narrow beam of X-rays from multiple angles and the computer generates an image of the brain.
Positron tomography detects positron emission in the brain tissue. The positrons are introduced into the brain by injection of a quantity of glucose that contains non harmless radioactive atoms. Glucose is transported through the blood to the brain. Because the active areas of the brain are energetically intensive, glucose will be in greatest quantities in these areas. In function on the concentration of glucose the concentration of positron will be determined, which indicates the level of activity of the brain areas.
Magnetic resonance imaging scan (MRI)
Magnetic resonance imaging scan is based on the following principle: hydrogen atoms behave like rotating magnets in the presence of a magnetic field. The blood flowing through the veins of the brain carries oxygen atoms. This movement can be detected by magnetic resonance scanning. This type of scan may also determine the changes in blood flow caused by brain activity, procedure called functional magnetic resonance scan.
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