| positron emission tomography |
A PET scan creates an image of the body (or of biochemical events) after the injection of a very low dose of a radioactive form of a substance, such as sugar. The scan computes the rate at which the tumor is using the sugar. In general, high-grade tumors use more sugar than normal and low-grade tumors use less. PET scans may also be used to see how well the tumor is responding to treatment
출처: www.legacyhealth.org/body.cfm
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| positron emission t. |
that accomplished by detection of gamma rays emitted from tissues after administration of a natural biochemical substance (e.g., glucose, fatty acids) into which positron-emitting isotopes have been incorporated. The paths of the gamma rays, which result from collisions of positrons and electrons, are interpreted by a computer, and the resultant tomogram represents local concentrations of the isotope-containing substance.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| positron emission tomography |
There are some isotopes (11C, 15O, 13N) which have a short half life and which emit positrons. During the annihilation of the positrons two gamma photons are emitted simultaneously 180?from one another. From that point, the simultaneous use of a large number of detectors positioned in a ring around the patient (positron camera) enables coincidence detection of the arrival of the two photons and location of where they came from.
출처: etoile.univ-lyon1.fr/ANGLAIS/sommary/glossary.html
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| positron emission tomography |
A nuclear medicine technique for imaging certain radionuclides or radioisotopes. This method can identify areas essentially anywhere in the body that exhibit "hot spots", which are sites of increased physiological activity, such as cancer cells. PET is used to study critically important elements of living tissue (eg, oxygen, nitrogen) and is commonly used for examinations of the brain and heart.
출처: www.keyhealth.net/definitions.html
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| positron emission tomography |
Uses radioisotopes to produce images of the activity of the brain and heart by tracking metabolism or blood flow and not anatomy.
출처: www.usnews.com/usnews/health/hospitals/articles/gl...
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