These artifacts occur when you do not completely erase the last image !
What is Ghosting BOO !
100
This is a a graph of the frequency of occurrence versus digital value intervals.
What is a Histogram
100
This artifact occurs when you use a grid and the grid lines are running parallel to the direction of the laser beam.
What is Moire
100
What is Lossy Compression used for ?
What is video recordings
100
The sampling frequency of a CR reader, which determines the number of measurements taken across a phosphor plate .
What is Nyquist
200
You would assume this is a foreign body inside your patient.
What is Dust or Debris
200
A software correction that is performed to equalize the response of each pixel to a uniform x-ray beam.
What is Flatfielding
200
Group of artifacts that occurs when an image field is not oriented with the size and dimensions of the IR.
What is alignment
200
This form of compression can reduce file size 100:1
What is Lossy
200
Excessive Noise Suppression can result in what problem ?
What is loss of spatial resolution
300
These can appear as a single point, a row, or a column.
What is a pixel artifact
300
The automatic collimation often fails in the ED and we have to do this to really see the entire collimated area.
What is Manually Shutter
300
Process of allowing two or more images to be projected on a single image.
What is partitioning
300
Which modality produces the largest image files ?
What is Digital Mammography
300
Applying too much edge enhancement to a digital image can result in this artifact.
What is Halo Artifact
400
A mathematical process of assigning a value to a dead pixel based on the recorded values of adjacent pixels ?
What is Interpolation
400
Excessive amount of background area exposed, or excessive scatter radiation in the image which causes type I histogram analysis software to mistake the "tail" portion of the histogram for the main lobe resulting makes the image appear:
What is underexposed
400
The type of noise which occurs from insufficient kVp, insufficient mAs, or improperly calibrated AEC.
What is mottle
400
Compression that reduces the data files 10% (10:1) to 50% (2:1) of its original size.
What is Lossless Compression
400
Long-term wear from x-ray exposure which does not occur on DR or CR but does happen if you have a screen !
What is radiation fatigue
500
If you don't use your CR plate and you don't erase it this will happen.
What is High Background
500
The algorithm that finds the midpoint in your data and then makes darker things less dark and brighter things more dark.
What is Dynamic Range Compression (DRC)
500
How many collimated margins are necessary to prevent an incorred image histogram and image artifacts ?
What is 4
500
What level if image compression is considered acceptable ?