From the case:
Geometric blur (illustrations)
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Figures 1, 2 and 3 demonstrate a reduction in geometric blur through;
decreasing focal spot size
decreasing object to image distance (OID)
increasing source to object distance (SOD)
Original illustrations by Lachlan McKay.
Case Discussion
Geometric blur is a type of blurring created by the relationship between the focal spot size and positioning of the source, patient (object) and detector (image) 1.
It may be described through the equation:
-
Geometric blur = f * (OID / SOD)
where f = focal spot size, OID = object to image distance and SOD = source to object distance.
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