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Dec 19 2010, 5:45 AM EST
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M.J.Fuller
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Change: These are definitely screen cleaning artifacts. It is ironic that one of the most common causes of artifacts on CR images is caused by the very cleaning process designed to remove them!Over Exposure This image is taken using a CR system.
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Feb 8 2010, 3:03 AM EST
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AndyC
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Change: Moved by AndyC Feb 8 2010, 3:03 AM EST
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Nov 3 2009, 4:41 AM EST
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M.J.Fuller
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Change: The grid was found to be up-side-down. The image was retaken with the grid orientated correctly without repetition of the artifact. Conclusion Artifacts such as those described above can result in an image being repeated. An
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Jul 20 2009, 5:00 PM EDT
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M.J.Fuller
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Change: by the same principle that causes a moire artifact in the printing industry. To avoid this artifact, you could place the cassette in the bucky in a portrait orientation or you can
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Jul 18 2009, 5:31 AM EDT
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M.J.Fuller
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Change: intereferenceinterference patterns see Jeremy Enfinger's excellent blog on this subject at http://bloggingradiography.blogspot.com/2008/01/to-grid-or-not-to-grid.html Scratches This is a low exposure test image taken with a CR cassette that was thought to contain scratches.
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Oct 1 2008, 8:03 AM EDT
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M.J.Fuller
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Change: This is quite a complicated subject although the concept of an interference pattern is elegantly simple. For a very comprehensive discussion of the subject refer to the document titled "Stationary Grids for Kodak Computed Radiography" by Xiouhui Wang, Ph.D., andDavid H. Foos, M.S. This
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Jul 16 2008, 8:10 PM EDT
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M.J.Fuller
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Change: repeat images from artifacts will improve efficiency and reduce patient radiation dose. Further Reading Jorg W. Oestmann, MD, Matbias Prokop, MD, Cornelia M. Schaefer, MD, Michael Galanski, MD Hardware and Software Artifacts in Storage Phosphor Radiography. Radiographics, September 1991 ....back to the applied radiography home page here
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Jun 14 2008, 10:01 PM EDT
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M.J.Fuller
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Change: This image is taken on a CR system. There is a horizontal artifact across the upper third of the image. It appears to involve bones and soft tissues but does not involve the black post-processing auto-coning. This is likely to be caused by
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Apr 13 2008, 9:18 AM EDT
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M.J.Fuller
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Change: the printing industry. To avoid this artifact, you could place the cassette in the bucky in a portrait orientation or you can change the grid to a different frequency that is compatible with the particular CR system that is being used (grid frequency higher than scan frequency).Note The grid
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Mar 19 2008, 3:23 AM EDT
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M.J.Fuller
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Change: photostimulable phosphor plate. When the plate was removed from the cassette, the marks were visible and looked like artifacts that might be associated with using a dirty cleaning cloth.It is noteworthy that whether you are cleaning CR or conventional DFFS screens, there are cleaning products provided by
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Mar 19 2008, 3:22 AM EDT
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M.J.Fuller
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Change: result in an image being repeated. An awareness of common artifact appearances can assist in finding a timely diagnosis and remedy. Minimising the number of repeat images from artifacts will improve efficiency and reduce patient radiation dose. ....back to the applied radiography home page here
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Mar 13 2008, 6:52 AM EDT
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M.J.Fuller
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Change: is defined as the height of the grid strip divided by the thickness of the interspace material.The grid frequency is defined as the number of grid strips or lines per inch or per centimetre. Note that the lateral view on the
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Mar 13 2008, 4:35 AM EDT
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M.J.Fuller
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Change: This image is taken on a CR system. The image is overexposed to a point where much of the lungfields contain no information. Because the pixel values are at infinity, no amount of window manipulation will reveal anatomical structures.Clearly, this image needs to be repeated. Conclusion Artifacts
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Mar 13 2008, 2:12 AM EDT
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M.J.Fuller
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Change: a moirean interference pattern. Imagine the longer parallel lines to be the grid lines and the shorter lines to be the laser reader path lines. For an interference pattern to occuroccur, the lines must be at different spacings or frequencies. If you squint at
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Mar 12 2008, 6:31 PM EDT
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M.J.Fuller
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Change: It is also the principle that lies behind the colours that you see in a bird's feather and on the surface of a CD or DVD. To avoid this artifact, you could place the cassette in the bucky in a portrait orientation or you can change the grid to
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Mar 12 2008, 8:33 AM EDT
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M.J.Fuller
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Change: pattern, particularly in the right hemithorax. This is likely to be caused by incompatibility of the CR system with the grid ratio of the wall bucky. This artifact could be thought of as a form of diffraction grating artifact or interference pattern. It is caused by the
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Mar 12 2008, 1:54 AM EDT
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M.J.Fuller
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Change: There were only format changes (bold, italics, etc.) in this version. See this version for details.
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Mar 12 2008, 1:53 AM EDT
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M.J.Fuller
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Change: what shoes you areyour wearing.footwear. CR Banding Artifact If you examine this PA chest radiograph closely you will notice that it has a subtle vertical banding pattern. This
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Mar 12 2008, 1:48 AM EDT
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M.J.Fuller
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Change: Locked by Mar 12 2008, 1:48 AM EDT for: no reason given
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Mar 12 2008, 1:48 AM EDT
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M.J.Fuller
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Change: if possible. Conclusion Artifacts such as those described above can cause an particular image to be repeated. An awareness of common artifact appearances can assist in finding a timely diagnosis and remedy. Minimising the number of repeat images from artifacts will improve efficiency and reduce patient radiation dose.
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