Cherish Madu: Difference between revisions
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'''Positron Emission Tomography''' | '''Positron Emission Tomography''' | ||
Positron emission tomography (PET) is a three-dimensional brain imaging technique that takes advantage of changes in metabolism to localize brain activity and functional processes in the body. The most active parts of the brain use more metabolic processes than do relatively inactive parts of the brain and PET is able to track this metabolic flow. Oxygen-15, the most | Positron emission tomography (PET) is a three-dimensional brain imaging technique that takes advantage of changes in metabolism to localize brain activity and functional processes in the body. The most active parts of the brain use more metabolic processes than do relatively inactive parts of the brain and PET is able to track this metabolic flow. Oxygen-15, the most commonly used radioactive tracer isotope, is injected into the bloodstream where it disperses to more active parts of the brain. Inside the brain, the radioactive tracer decays into a positron and an electron. When the positron collides with an electron, two gammas rays are produced. The accumulation of these pairs of gamma rays is measured by gamma-ray detectors which are placed all around the subject's head. Computer analyses construct the radioactive tracer concentration into three-dimensional images. | ||
High Spatial resolution | High Spatial resolution | ||
No temporal resolution | No temporal resolution | ||
Revision as of 21:07, 6 June 2013
This wiki explores the methods that those interested in neuroscience most frequently employ when investigating and explaining cognitive processes in terms of brain structure and function.
Transcranial Magnetic Stimulation Overview, Advantages, Disadvantages
Optogenetics Overview, Advantages, Disadvantages
Electrophysiological recording of neurons Overview, Advantages, Disadvantages
Electroencephalography (EEG) Overview, Advantages, Disadvantages
Positron Emission Tomography Positron emission tomography (PET) is a three-dimensional brain imaging technique that takes advantage of changes in metabolism to localize brain activity and functional processes in the body. The most active parts of the brain use more metabolic processes than do relatively inactive parts of the brain and PET is able to track this metabolic flow. Oxygen-15, the most commonly used radioactive tracer isotope, is injected into the bloodstream where it disperses to more active parts of the brain. Inside the brain, the radioactive tracer decays into a positron and an electron. When the positron collides with an electron, two gammas rays are produced. The accumulation of these pairs of gamma rays is measured by gamma-ray detectors which are placed all around the subject's head. Computer analyses construct the radioactive tracer concentration into three-dimensional images. High Spatial resolution No temporal resolution Invasive. Injection of radioactive molecules
Functional Magnetic Resonance Imaging Like PET, Functional magnetic resonance imaging (fMRI)