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  • Identify artifact: Double image of equine tarsus. One image properly exposed. Second image partially outside collimated field and appears “ghosted”.
  • Cause: Incomplete erasure of the imaging plate. “Ghost” image.
  • Prevention: Ensure imaging plates are properly erased:
  • erased at regular intervals
  • sufficient lumens for complete erasure
  • The question was worth a total of 6 points. The average score was 4.45/6.0 or 74%. Most candidates were able to identify the double image. Some candidates believed the double image to be caused by double exposure or scatter radiation.