Geometrical Qualities

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Geometrical Qualities

Spatial Resolution (sharpness)

Sharpness = SOD/OID

Penumbra = (FS x OID) / SOD

Radiographer's Job

*Digital equipment parameters

Increase SID

Reduce focal spot size

reduce OID

eliminate motion

Poor spatial resolution

caused by unacceptable levels of penumbra as compared to the umbra

Umbra

uniform darkness of the inner-most shadow

Penumbra

blurry, fading partial shadow projected at each edge

Higher spatial resolution

higher resolution means two objects can be demonstrated to be smaller or closer together

Sharpness of the structural edges recorded int he image

Magnification (size distortion)

Calculations

Image Size/Object Size = SID/SOD

Magnification = SID/SOD

the difference between the size of the real object and the size of its projected image

Shape Distortion

The difference between the shape of the real object and the shape of its projected image