What Is Geometric Unsharpness

Geometric unsharpness refers to the loss of definition that is the result of geometric factors of the radiographic equipment and setup. … The three factors controlling unsharpness are source size, source to object distance, and object to detector distance.

What causes geometric unsharpness?

Geometric unsharpness is caused by aspects of the geometry of the X-ray beam. Two principal factors play simultaneously: the apparent focal spot size and the ratio between object-film distance (OFD) and focus-film distance (FFD).

What is geometric properties in radiography?

The distinctness or sharpness of the structurall lines that make up the recorded image. a result of the relationship among the size of the focal spot, SID, and OID. Which alters the amount of unsharpness recorded in the film image.