Digital radiography - Ch 23 part 6 artifacts

16 terms by cassandar1491 

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from Quizlet user rmaemarks

appear as a result of incomplete IP erasure

phantom images

permanent artifacts caused by damage to the IPs.

scratches or tears
must replace IP

caused by dust or foreign material on the IP

Light spots

Reductions in resolution either overall or in specific areas.
Mostly accompanied by...
Result from..

Dropout artifacts
contrast scale reductions
accumulation in the CR or laser imaging unit components (polygonal mirror, light gate, or other reflective surfaces).

Fogging in CR is due to

IPs being much more sensitive than film to background radiation

is caused by inadequate exposure - usually insufficient mAs
quantum mottle or reticulation

quantum mottle or reticulation

Heat blur

caused from IR being exposed to intense heat - Can cause a squiggly line effect

Caused by uneven transport of film material through a laser imaging system including uneven scanning, distortion and overlapping shading
laser film transport artifacts

laser film transport artifacts

Imaging plates are MORE/LESS sensitive to scatter

MORE - both before and after x-ray exposure

Recommendation for erasing IPs

daily

Smaller DELs =

higher resolution

__ erasures may need to be done in order to completely remove the image
with phantom or ghost artifact

2

white line along lenght of travel on image is due to...

dust on light guide

cover a wide range of image problems that correspond to post acquisition processing functions available on CR

algorithm artifacts

may be due to improper collimation, improper technique, beam alignment, scatter, extreme density differences

histogram analysis error

results in grid lines or poor image quality

poor grid alignment

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