MEDICINE
RADIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A long cone is used in the paralleling or right-angle radiographic technique to:
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reduce secondary radiation.
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avoid distortion of image shape.
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reduce magnification of the image
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avoid superimposition of anatomic structures.
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facilitate correct vertical angulation of the cone.
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Explanation:
Detailed explanation-1: -The paralleling technique is accomplished by placing the receptor parallel to the long axis of the tooth. After this parallel relationship has been established, the central ray must be directed perpendicular to both the tooth and receptor.
Detailed explanation-2: -However, this can be compensated for by using an increased source-object distance, which decreases magnification and unsharpness. The paralleling technique, when performed correctly, is superior to the bisecting angle technique because it produces an image with both linear and dimensional accuracy.
Detailed explanation-3: -Using the long-cone parallel technique with a Rinn film holder (Dentsply International Inc.).
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