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artifact |
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artifact /ar·ti·fact/ (ahr´tĭ-fakt″) any artificial (man-made) product; anything not naturally present, but introduced by some external source.
artifact [är′təfakt] Etymology: L, ars, skill, facere, to make anything artificially made; may be extraneous, irrelevant, or unwanted, such as a substance, structure, or piece of data or information. In radiologic imaging, spurious electronic signals may appear as an artifact in an image with as much strength as the signals produced by the real objects, thereby confusing the radiologist and the results of any examination. artifact, n 1. anything made by human hands or activities. 2. a product that may develop during an analysis performed to identify the composition of a substance. Mainly a consequence of the conditions of the analysis. artifact (är´t n a blemish or image in the radiograph that is not present in the roentgen image of the object. artifact a structure or appearance that is not natural, but is due to manipulation (man-made). dermatohistopathological artifact may be due to sampling errors (selection, preparation or technique) or processing of specimens. radiological artifact defects in the x-ray film image due to faults in the cassette (screen artifact) or in the film (film artifact). static artifact a mark on x-ray film caused by discharge of static electricity. ultrasound artifact irregularities produced in the image display. See acoustic shadowing, acoustic enhancement, comet-tail, reverberation. artifact Artefact A structure not normally present, but produced by some external action; something artificial; the distortion of a substance or signal, which interferes with or obscures the interpretation of a study, or a structure that is
not representative of a specimen's in vivo state, or which does not reflect the original sample, but rather the result of an isolation procedure, its handling or other factors; artifacts in electronic readout devices–eg, EEG, EKG, and
EMG, may be due to loose leads or electrical contacts Cardiac pacing An electrical impulse of noncardiac origin which is recorded as a vertical spike on an EKG or other ECG monitor–eg a pacemaker pulse; electrical signals from muscle
contractions, or myopotentials, are called muscle artifacts Imaging The artifact seen depends on the procedure–eg, barium enema, where zones of inconstant segmental contractions of the colon may be confused with organic constrictions or
anatomic variations, due to mucosal or intramural tumors, or a metal surgical clip that obscures an anatomical structure. See Beam-hardening artefact, Edge artefact, Mosaic artefact, Ring artefact. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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articulator, crescent articulatory pop articulatory technique articulatory treatment system articulo articulo mortis articulus artifact artifacts artifactual modification artificial artificial abortion artificial airway artificial airway management artificial ankylosis |
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