Blur
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
