For medical radiography, see Medical radiography. For the medical specialty, see Radiology. Radiography of knee in modern x-ray machine Radiography is the use of X-rays to view a non-uniformly composed material (i.e. of varying density and composition) such as the human body. A heterogeneous beam of X-rays is produced by an X-ray generator and is projected toward an object. The density and composition of each area determines how much of the ray is absorbed. The X-rays that pass through are captured behind the object by a detector (either photographic film or a digital detector). The detector 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), unlike plain-film tomography, generates 3D representations used computer-assisted reconstruction. Applications of radiography include medical radiography and industrial radiography: if the object being examined is living, whether human or animal, it is regarded as medical;[clarification needed] all other radiography is regarded as industrial radiographic work. Contents
Posted on: Wed, 14 Aug 2013 05:13:22 +0000
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