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Discussion: Artifacts in II imagesReported This is a featured thread

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Hjemly
Hjemly
Artifacts in II images
Jun 26 2009, 8:10 AM EDT | Post edited: Jun 26 2009, 8:10 AM EDT
A simple test discovered serious image lag/superimposing of previous images in an 1K x 1K Imager-Intensifyer system. This system was until recently used for UVI exams, and nobody knows how many times a marker ore a calcification in previous patiens has been mistaken for patology.. After this test, with imaging a lead-ruler in different positions, the laboratory was immediatly shut down. It was too expensive to repair, and the department bougth a new system some months later. Has anyone found similar problems? Do you find this valuable?    
eliseleblanc
eliseleblanc
1. RE: Artifacts in II images
Jun 26 2009, 9:20 AM EDT | Post edited: Jun 26 2009, 9:20 AM EDT
I once processed an unexposed CR cassette and saw remnants of the previous images on the resultant image. Since this was a CR unit... I thought maybe it could be low erasure efficiency. Nothing was done about this problem. It was demonstrated in several cases.

This article: http://www.e-radiography.net/nickspdf/QA%20of%20Computed%20Radiography%20Systems%20DRAFT4.0b.pdf explains a QC test to assess erasure efficiency. I did not do the test as I am a student and do not have the authority to do so.

I am also interested to know if anyone else has found this problem and how it was corrected.
 Do you find this valuable?    
pvt.Ghoul
pvt.Ghoul
2. RE: Artifacts in II images
Jul 6 2009, 5:00 PM EDT | Post edited: Jul 6 2009, 5:00 PM EDT
eliseleblanc, this site you found, e-radiography.net, is a savior... Many thxs! Do you find this valuable?    

synoptic
3. RE: Artifacts in II images
Jul 7 2009, 2:18 PM EDT | Post edited: Jul 7 2009, 2:18 PM EDT
Out of interest, was the II quite old? Did it use a video tube rather than a CCD? Do you find this valuable?