Question

the distance between an object and the image receptor is 2 inches. the distance between the source the the object is 20 inches. if the focal spot size is 2 mm, what is the geometric unsharpness in mm?

Answer 1

The lack of sharpness in an image caused by variations in the geometry of an X-ray system's configuration is known as geometric unsharpness (Ug).

How does the distance between an object and a film affect geometric unsharpness?

The geometric unsharpness also decreases as the source size decreases.The unsharpness can also be reduced for a given size source by increasing the distance between the source and the object, but this results in a lower radiation intensity.

How far is the focal film?

The distance between and is described by the focal-film distance (FFD).wellspring of the x-beam bar (the central spot) and the film surface.This measurement is also referred to as the source-image distance (SID).affects the intensity of the x-ray beam, distortion, and magnification.

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