Location: Artifacts and Artefacts

Discussion: comment on CR Banding imageReported This is a featured thread

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iraydee8
iraydee8
comment on CR Banding image
Apr 13 2008, 1:55 AM EDT | Post edited: Apr 13 2008, 1:55 AM EDT
Images are difficult to reveiw in this format, but it seems that the PA chest labeled CR Banding, has a artifact caused more from processing then from grid ratio. This is also called "blooming artifact" It at least appears to be. Grid More artifact is demonstrated in its perfection on the website you posted: http://bloggingradiography.blogspot.com/2008/01/to-grid-or-not-to-grid.html

Grid morie is generally seen on images displayed on monitors, as I have never seen it on a medical image in print as you described in your post. "It is caused by the same principle that causes a moire artifact in printing."

I would appreciate your exanding on your thoughts on this in a print medium. 1  out of 1 found this valuable. Do you?    
Keyword tags: artefact artifact
M.J.Fuller
M.J.Fuller
1. RE: comment on CR Banding image
Apr 13 2008, 9:16 AM EDT | Post edited: Apr 13 2008, 9:16 AM EDT
Thanks for your comments on CR banding. I was not aware of blooming artifact and couldn't find any information on it- I will post information on the distinction between CR banding and blooming artifact if I can find any- can you help?

The artifact was thought to be an interference pattern because it appeared consistently with images taken using the same wall bucky/grid and CR system and only with the cassette in the landscape position (it never appeared on lateral chest images). This was assumed to be caused by interference between the 'image of the grid' and the laser reader. I have also experienced interference patterns that closely resemble the one shown on Jeremy Enfinger's site but with a different wall bucky/grid and laser reader.

My comments on moiré artifact in printing may have been confusing. I was simple noting that the principle of banding from interference between different frequencies underlies Moiré artifact that people in the print industry are very familiar with.

I commend you for taking the trouble to comment on this issue.

M.J.FULLER

NB I noticed that I used the term "grid ratio" instead of "grid frequency" on this page- wll fix this

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