MEDICINE
RADIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The length of the position-indicating device is changed from 16 inches to 8 inches. Thischange will result in the intensity of the X-ray beam to be:
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half as intense.
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twice as intense.
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four times as intense.
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one-fourth as intense.
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Explanation:
Detailed explanation-1: -If we increase the distance, the beam intensity decreases following the inverse square law (Figure 7).
Detailed explanation-2: -If the length of the PID is changed from 8 to 16 inches, how does this affect the intensity of the x-ray beam? A. The resultant beam will be one-half as intense.
Detailed explanation-3: -Increasing the tube voltage or the total amount of filtration or both will increase the average photon ener-gy and thereby the x-ray beam penetrating power.
Detailed explanation-4: -Altering the time setting influences the quantity of x-rays and image density or darkness in intraoral radiography.
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