What is a superimposition artifact?
superimposition of two structures from different locations due to double exposure of same film/plate.
What does artifact in xray mean?
Radiographic artifact This is spurious or unclear appearance of an anatomical structure due to radiographic technique. As previously discussed, examples include rotation, incomplete inspiration and incorrect penetration. Other radiographic artifact includes clothing or jewellery not removed.
What does an artifact on an MRI mean?
It is a feature appearing in an image that is not present in the original object. Many different artifacts can occur during MRI, some affecting the diagnostic quality, while others may be confused with pathology. Artifacts can be classified as patient-related, signal processing-dependent and hardware (machine)-related.
What is an artifact in a bone scan?
The most commonly occurring artifacts are urine contamination, radionuclide extravasation at the injection site, and soft-tissue localization from intramuscular injection of medications. An awareness of the appearance of these typical artifacts will serve to alert the technologist to the possible source of abnormality.
What is an artefact in the lung?
According to the international consensus conference, BLA is defined as discrete laser-like vertical hyperechoic reverberation artefacts that arise from the pleural line (previously described as “comet tails”), which extend to the bottom of the screen without fading, and move synchronously with lung sliding.
Is there a difference between artefact and artifact?
artifact vs artefact Artefact is the original British English spelling. Artifact is the American English spelling. Interestingly, unlike most American spellings, artifact is the accepted form in some British publications.
What is an artifact in your lung?
Lung atelectasis, consolidation and/or pleural effusion may create a mirror image, intracardiac artifact in mechanically ventilated patients, which we termed the ‘cardiac-lung mass’ artifact, to emphasize the important diagnostic role of both echocardiography and lung echography in these patients.
What causes moire effect in xray?
Aliasing or moiré patterns can easily be caused by low frequency grids in a digital image, because of the very high contrast signal that the grid strips project onto the detector that are beyond the “Nyquist frequency” but still resolvable by the digital detector.
What causes bline?
In the presence of extravascular lung water (EVLW), the ultrasound beam finds subpleural interlobular septa thickened by edema. The reflection of the beam creates some comet-tail reverberation artifacts, called B-lines or ultrasound lung comets.