Chapter 09 X-Ray Emission-Bushong Test Bank

Chapter 09: X-Ray Emission Bushong: Radiologic Science for Technologists




MULTIPLE CHOICE


1. Grays, or milligrays, in air are the measurement for x-ray .
a. quantity and intensity
b. exposure and quantity
c. intensity and exposure
d. quantity, exposure and intensity




ANS: D
Grays are the measurement for x-ray quantity, exposure or intensity.


2. The number of x-rays in the useful beam defines x-ray .
a. kVp
b. quality
c. Intensity
d. mAs




ANS: C
The number of x-rays in the useful beam defines x-ray intensity.


3. Standard x-ray machines produce about µGya/mAs at 70 kVp measured at 100 cm SID.
a. 20
b. 50
c. 100
d. 200

, ANS: B
Standard x-ray machines produce about 50 µGya/mAs at 70 kVp measured at 100 cm SID.


4. X-ray intensity increases in direct proportion to increases in .
a. mAs
b. kVp
c. distance
d. filtration




ANS: A
X-ray quantity increases in direct proportion to increases in mAs.


5. If the distance from the source to the image (SID) is reduced by half, how is the x-ray intensity
at the image affected? a. It is increased 4 times.
b. It is doubled.

, c.
d.




ANS:
It is reduced by 1/2.
It is reduced by 1/4.




A
If the SID is reduced by 1/2, the intensity at the image increases 4 times, because of the
inverse square law.
6. If filter thickness is , then x-ray intensity is .
a. reduced; reduced
b. increased; reduced
c. reduced; increased
d. increased; reduced and reduced; increased




ANS: D
If filter thickness is increased, then x-ray intensity is decreased and if filter thickness is
decreased, then x-ray intensity is increased.
7. A 10% increase in kVp has effect on x-ray intensity than/as a 10% increase in mAs. a. the
same
b. much greater
c. less
d. much less




ANS: B