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19 Cards in this Set

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Artifact

Any false visual feature on a medical image that simulates tissue or obscures tissue

Artifact identified as...

Plus or minus

Plus density-

Greater than surrounding tissue

Minus density-

Lower in density than surrounding tissue (marker)

Most common source of artifacts

Receptor plate

Fogging is caused by

Background radiation

Kinds of artifact

Adhesive tape, hair,

Bright white scratches are what..

Negative density (same as white markers)

Intermittent appearance of line patterns caused by..

Problems in the plate readers electronics

Consistently appearing artifacts on most or all images are likely the result of..

Hardware of software problems

White line on image caused by..

Dust or dirt on mirrors and light guides

Ghost images

Incomplete erasure

Alisasing or moire pattern caused by

Spatial frequency is greater than sampling frequency

Nyquist theorem

States that the sampling frequency must be at least 2 times spatial resolution

Moire effect is less than

60 lp/mm

Detector lag is what side

Pre processing

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