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| Brain positron emission tomography ： ウィキペディア英語版 |
Brain positron emission tomography
Positron emission tomography (PET) measures emissions from radioactively labeled metabolically active chemicals that have been injected into the bloodstream. The emission data are computer-processed to produce multi-dimensional images of the distribution of the chemicals throughout the brain.〔Lars-Goran Nilsson and Hans J. Markowitsch (1999). ''Cognitive Neuroscience of Memory''. Seattle: Hogrefe & Huber Publishers., page 57〕
==Process==
The positron emitting radioisotopes used are usually produced by a cyclotron, and chemicals are labeled with these radioactive atoms. The labeled compound, called a ''radiotracer'', is injected into the bloodstream and eventually makes its way to the brain through blood circulation. Detectors in the PET scanner detect the radioactivity as the compound charges in various regions of the brain. A computer uses the data gathered by the detectors to create multi-dimensional (normally 3-dimensional volumetric or 4-dimensional time-varying) images that show the distribution of the radiotracer in the brain. Especially useful are a wide array of ligands used to map different aspects of neurotransmitter activity, with by far the most commonly used PET tracer being a labeled form of glucose (see Fludeoxyglucose (18F) (FDG)).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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