Blur

Last revised by Andrew Murphy on 11 Sep 2020

Blurring, or unsharpness, refers to the distortion of the definition of objects in an image, resulting in poor spatial resolution

Types of blur

  • geometric blur
    •  limited by focal spot size, distance from the source to the patient, distance from patient to receptor
  • detector blur
    • ​limited by detector components (screen thickness in film systems, detector element size in digital systems)
  • motion blur 
    • caused by voluntary/involuntary patient movement 
  • absorption blur
    • blurring at the edge of a rounded/tapered structure where there is a gradual change in x-ray absorption across this boundary

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