, DENTAL RADIOLOGY FINAL EXAM
QUESTIONS AND ANSWERS 100%
CORRECT!
If you increase distance, what happens to the intensity of the beam? - ANSWER The
intensity decreases so increase exposure time by four
If you decrease distance, what happens to the intensity of the beam? - ANSWER The
intensity increases so decrease exposure time by four
What does kVp stand for? - ANSWER Kilovoltage potential
What type of contrast is black and white? - ANSWER high contrast (short scale)
What type of contrast has many shades of gray; a lot of detail? - ANSWER Low contrast
(long scale)
increase kVp= - ANSWER decrease in contrast
decrease kVp= - ANSWER increase in contrast
What is the inverse square law? - ANSWER Increased TFD increases intensity,
therefore increase distance decreases density so multiply exposure time by 4. Increase
TFD and increase exposure time to get same exposure time.
How much greater is intensity at a short distance? - ANSWER 4x's as greater; intensity
is 1/4 as intense at 16"
What is the half value layer? - ANSWER Measurement of quality of beam outside the
tubehead; measures accuracy of kVp setting; aluminum filter. Word quality has to be
there.
Quality= - ANSWER kVp
What does kVp control? - ANSWER wavelength
QUESTIONS AND ANSWERS 100%
CORRECT!
If you increase distance, what happens to the intensity of the beam? - ANSWER The
intensity decreases so increase exposure time by four
If you decrease distance, what happens to the intensity of the beam? - ANSWER The
intensity increases so decrease exposure time by four
What does kVp stand for? - ANSWER Kilovoltage potential
What type of contrast is black and white? - ANSWER high contrast (short scale)
What type of contrast has many shades of gray; a lot of detail? - ANSWER Low contrast
(long scale)
increase kVp= - ANSWER decrease in contrast
decrease kVp= - ANSWER increase in contrast
What is the inverse square law? - ANSWER Increased TFD increases intensity,
therefore increase distance decreases density so multiply exposure time by 4. Increase
TFD and increase exposure time to get same exposure time.
How much greater is intensity at a short distance? - ANSWER 4x's as greater; intensity
is 1/4 as intense at 16"
What is the half value layer? - ANSWER Measurement of quality of beam outside the
tubehead; measures accuracy of kVp setting; aluminum filter. Word quality has to be
there.
Quality= - ANSWER kVp
What does kVp control? - ANSWER wavelength
