Changes

[[File:Focal spot size and unsharpness in X-ray.jpg|thumb|340px|Source-object distance (SOD) and source-detector distance (SDD) and geometric unsharpness.<ref>{{cite journal|title=Digital radiography for the inspection of small defects|author=Bruce Blakeley, Konstantinos Spartiotis|url=http://www.twi-global.com/technical-knowledge/published-papers/digital-radiography-for-the-inspection-of-small-defects-february-2006/|journal=Insight|volume=48|issue=2|year=2006}}</ref> <br> This image also shows '''geometric unsharpness''', which is a decrease in the spatial resolution of an image because the X-rays from the generator comes from an area rather than a single dot, and is decreased by having the object closer to the detector.]]