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The two possible design geometries for micro-CT are based on rotating gantry (A) or rotating specimen (B). The effect of penumbra blurring: for the same focal spot size (fs) of the x-ray source the penumbra blurring b is larger when the object is closer to the source (C) than when the object is closer to the detector (D). sod and odd refer to the source-object-distance and object-detector-distance.
