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 Radiography

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taixyz1992

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PostSubject: Radiography   Sun Oct 03, 2010 10:13 am

Radiography is the use of X-rays to view a cross sectional area of a non uniformly composed material such as the human body. By utilizing the physical properties of the ray an image can be developed displaying clearly, areas of different density and composition.

A heterogeneous beam of X-rays is produced by an X-ray generator and is projected toward an object. According to the density and composition of the different areas of the object a proportion of X-rays are absorbed by the object. The X-rays that pass through are then captured behind the object by a detector (film sensitive to X-rays or a digital detector) which gives a 2D representation of all the structures superimposed on each other. In tomography, the x-ray source and detector move to blur out structures not in the focal plane. Computed tomography (CT scanning) is different to plain film tomography in that computer assisted reconstruction is used to generate a 3D representation of the scanned object/patient.

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