artefact

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Related to Artefacts: Artifacts

artifact

 [ahr´tĭ-fakt]
1. any artificial product; a structure or appearance that is not natural, but is due to manipulation.
2. distortion or fuzziness of an image caused by manipulation, such as during compression of a digital file.
film artifact artificial images on x-ray films due to storage, handling, or processing.
phantom artifact artificial images seen with conventional tomography.
standardization artifact an electrical stimulus of 1 mV deliberately introduced into the electrocardiogram so that pulse amplitudes on the tracing can be adjusted to 10 mm. The amplitudes of the P, QRS, and T intervals can be accurately evaluated only on an electrocardiogram thus standardized.

ar·ti·fact

(ar'ti-fakt),
1. Anything, especially in a histologic specimen or a graphic record, which is caused by the technique used and does not reflect the original specimen or experiment.
2. A skin lesion produced or perpetuated by self-inflicted action, as in dermatitis artefacta.
Synonym(s): artefact
[L. ars, art, + facio, pp. factus, to make]

artefact

(är′tə-făkt′)
n.
Variant of artifact.

artefact

(1) A structure not normally present, but produced by some external action; something artificial.
(2) 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 is the result of an isolation procedure, its handling or other factors. Artefacts in electronic readout devices (e.g., EEG, EKG, and EMG) may be due to loose leads or electrical contacts.
 
Cardiology
An electrical impulse of noncardiac origin which is recorded as a vertical spike on an EKG or other ECG monitor (e.g., a pacemaker pulse); electrical signals from muscle contractions, or myopotentials, are called muscle artefacts.
 
Histology
Any change in tissue that occurs during tissue processing which may alter a tissue’s appearance and possibly the diagnosis.

Imaging
The artefact seen depends on the procedure. For example, in a 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 tumours, or a metal surgical clip that obscures an anatomical structure.

ar·ti·fact

(ahr'ti-fakt)
1. Anything (especially in a histologic specimen or a graphic record) that is caused by the technique used or is not a natural occurrence but is merely incidental.
2. A skin lesion produced or perpetuated by self-inflicted action, such as scratching in dermatitis artefacta.
Synonym(s): artefact.
[L. ars, art, + facio, pp. factus, to make]

artefact

something that appears during preparation or examination of material which is not present in the natural state. Two scientists from the University of Surrey, Harold Hillman and Peter Sartory, have suggested on the evidence provided by solid geometry, that some structures described by electron microscopy, e.g. Golgi apparatus, nuclear pores, endoplasmic reticulum, are artefacts of the preparation of material.

artefact 

Anything made or introduced artificially which misleads the results of an investigation, image or test. Example: in visual evoked cortical potentials, any wave that has its origin elsewhere than in the visual area.

ar·ti·fact

, artefact (ahr'ti-fakt)
Anything, especially in a histologic specimen or a graphic record or x-ray, caused by the technique used that does not reflect the original specimen or experiment.
[L. ars, art, + facio, pp. factus, to make]
References in periodicals archive ?
After it emerged that Punjab had on several occasions turned down K-P's demands for the return of its artefacts, the meeting decided that a summary for the repatriations of artefacts from Taxila will soon be shared with the federal government as previously the Punjab government has declined several times.
'In Takeo, there are always many students and national and international visitors studying the history of artefacts kept in our museums.
The artefacts from Pakistan has been arranged through the joint efforts of the Embassy of Pakistan in Beijing, National History and Literary Heritage Division in Islamabad and the Chinese Embassy in Islamabad.
"The return of the artefacts was executed in an unprecedentedly short period after the Italian authorities reported the incident to the Egyptian counterparts," Waziri told Ahram Online.
Smuggling of artefacts is a serious crime with global laws put in place to try and stop the illegal black market sale of such antiques, Colonel Bu Rasheed added.
Both the parties have agreed not to go into details about how the artefacts came to be in the United States, he added.
* Artefacts and sites will occur at medium to high density on the flats and immediate river banks (fourth-order streams and above) if they are above the flood level.
The expert ensures that "we chose these burnt artefacts because they can tell us in a very simple way whether they have been modified after being exposed to fire."
The accused has said that they had booked the container with the artefacts.
Lieutenant Colonel Abdullah Al Shamsi, Director of the City police, said the CID division at the station had been tipped off that an Arab expatriate driver was trying to dispose off an archeological artefact.
The difference between technical artefacts and technical systems seems to be one mainly of scale and complexity.
There is ongoing dispute about other space-time patterns of backed artefacts in Australia.