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Quality of the radiographic image
Contrast Image geometry Characteristics of the x-ray beam Image sharpness and resolution
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Perception of the radiographic image
Partial images-we all see the same partial images but we don’t necessarily perceive the same object Contrast Context
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Effect of partial image
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The effect of contrast
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The effect of context
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Image geometry Positioning of the film, object and x-ray beam
Focal spot size and principle of line focus Focal spot-object distance (FSOD), object- to film-distance (OFD)
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Ideal image geometry requirements
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Focal spot size, heat distribution and image sharpness
Focal spot 1mm Heat needs to be distributed over as large as possible area Principle of line focus
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Focal spot-to film-distance(FSFD)
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FSFD Increasing the distance between the focal
spot and the object results in an image with increased sharpness and less magnification of the object
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Object-to film- distance (OFD)
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Decreasing the distance between the
object and the film increases the sharpness and result in less magnification of the object
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Image shape distortion
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Cont’d
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Bisecting angle technique-shape distortion
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Cont’d
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