Imaging artefacts practice quiz Flashcards
Which artefacts can result in duplication of a structure:
Acoustic shadowing artefact
Refraction artefact
Missed option - incorrect
Mirror image artefact
Mirror image artefact
Refraction artefact
Assumptions that may be violated resulting in artefacts include:
Echoes attenuation at different rates depends on the tissue
Echos reflect only once from a given structure
Echos originate from a central beam
The speed of sound varies in different tissues
Echos reflect only once from a given structure
Echos originate from a central beam
Which of the following are causes of artefact?
Operator Error
Violation of assumptions
Quality assurance
Equipment malfunction
Operator Error
Violation of assumptions
Equipment malfunction
Artefacts may result in structures being displayed in a position that does not correspond to their actual position.
True
False
True
Match the beam dimension artefact with the correct origin of formation.
Slice thickness artefacts
Side lobes/ grating lobe artefacts
Beamwidth artefacts
Result from structures detected in front or behind the main imaging plane
Result from structures detected by secondary beams located outside the main beam.
Results from the incorrect display of echos in the lateral plane.
Side lobe artefacts are the leading cause of near field clutter.
True
False
True
Which of the following statements are true?
A common example of acoustic shadowing is increased brightness posterior to a fluid filled structure.
A common example of acoustic shadowing is the interface between soft tissue and a prosthetic valve.
Acoustic shadowing results in hyperechoic areas distal to weak reflectors.
Acoustic shadowing occurs when the transmitted beam encounters a structure that attenuates less than surrounding structures.
A common example of acoustic shadowing is the interface between soft tissue and a prosthetic valve.
