unsharpness


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unsharpness

A quantitative measure of the loss of edge detail due to geometric properties of the object and imaging system and not to image noise or X-ray scatter. Unsharpness is usually expressed as the width of the band of changing density or brightness arising from a sudden change in the intensity of the radiation incident on the film or fluorescent screen.

Factors contributing to image unsharpness
Geometric unsharpness, movement unsharpness, absorption unsharpness, image receptor unsharpness and parallax unsharpness. It is known from observation that the total unsharpness is not the direct sum of the contributing factors; rather, it is dominated by the unsharpness of the largest individual factor.

unsharpness

lack of detail in an x-ray picture.
References in periodicals archive ?
Despite the best possible effort, patient factors such as obesity, hypoventilation, and motion unsharpness can hinder diagnostic interpretation.
The clinician will benefit from the XRWARE Virtual Grid as it will offer better visibility and contrast of the small and weak structure, better depiction of overlapping structure, simultaneous viewing of bone and soft tissue, reduced window width & window levelling, improved motion unsharpness reduction.
Fuzzy system is introduced to deal with the issue of uncertainty and unsharpness of collected data.