Brain Scans
Brains scans are used to view the brain without actually having cranial surgery. They combine camera images with a computer to give a view of what is going on inside someone's or something's head. Some scans are used to delineate the structure of a disease, other scans are used to find brain injuries or tumors, and still others are used to study how the brain works. There are seven main scans that used for testing today. These include, Electroencephalography (EEG), Positron Emission Tomography (PET), Computerized Tomography (CT), Magnetic Resonance Imaging (MRI), Functional Magnetic Resonance Imaging (fMRI), Magneto Encephalography (MEG), and Near-Infrared Spectroscopy (NIRS). An Electroencephalograph is attained by attaching electrodes to the skull, which measure electric brain waves in certain areas of the brain. These waves are then printed out so they can be read and studied. This technique is often used when people are sleeping, and also for testing people's reactions to certain things. Recently the EEG has been used to distinguish reaction times between people who have never been addicted to drugs or alcohol and people who have been addicted at some point. Scientists play a loud and abrasive noise, along
Being able to see if cancer has expanded by using CT scans helps doctors to decide whether or not radioactive treatment is needed. This is the first time scientists have been able to obtain three-dimensional pictures of a fetus in a non-invasive manner. This deterioration shows that a decrease in the blood flow for the frontal lobe, but normal flow to all motor cortexes and the visual cortex. More doctors are looking toward this new way of testing because other methods, such as fetal heart rate monitors, test positive for diseases falsely. The amount of radiation that passes through the head in each direction is measured and recorded. The PET shows a definite pattern of deterioration in all Alzheimer's patients. uk/webprojects2002/wrigglesworth/brainimaging. It is somewhat like an EEG but one that produces real time images of the brain. During rest oxy and deoxyhemoglobin were unpredictable. Cross-sectional images are created at different levels throughout the brain. This condition is called hyperexcitability, Begleiter suggests that people at risk for alcoholism inherit a general state of hyperexcitability, and that drinking alcohol relieves this state. This shows that they can not distinguish between new sounds and sounds that are predictable.
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Acceptance Essays
