Chapter 3 End of Questions

Question 1

In dental imaging, the quality of the x-ray beam is controlled by:

a. kilovoltage
b. milliamperage
c. exposure time
d. source-to-receptor distance

Answer 1

a.

Question 2

2. Identify the kilovoltage range for current dental x-ray machines:
   a. 50 to 60 kV
   b. 60 to 70 kV
   c. 70 to 100 kV

Answer 2

b.

Question 3

3. A higher kilovoltage produces x-rays with:
   a. greater energy levels
   b. shorter wavelengths
   c. more penetrating ability d. all of the above

Answer 3

d.

Question 4

4. Identify the unit of measurement used to describe the amount of electric current flowing through the x-ray tube:
   a. volt
   b. ampere
   c. kilovoltage
   d. force

Answer 4

b.

Question 5

Radiation produced with high kilovoltage results in: a. short wavelengths

b. long wavelengths
c. less penetrating radiation
d. lower energy levels

Answer 5

a.

Question 6

In dental imaging, the quantity of radiation produced is controlled by: a. kilovoltage

b. milliamperage
c. exposure time
d. both b and c

.

Answer 6

d.

Question 7

7. Increasing milliamperage results in an increase in:
   a. temperature of the filament
   b. mean energy of the beam
   c. number of x-rays produced
   d. both a and c

Answer 7

d.

Question 8

8. Identify the milliamperage range used for current dental x-ray machines:
   a. 1 to 5 mA
   b. 6 to 8 mA
   c. 9 to 15 mA
   d. greater than 15 mA

Answer 8

b.

Question 9

9. The overall blackness or darkness of an image is termed:
   a. contrast
   b. density
   c. overexposure
   d. polychromatic

Answer 9

b.

Question 10

10. If kilovoltage is decreased with no other variations in exposure factors, the resultant image will:
    a. appear lighter
    b. appear darker
    c. remain the same
    d. either a or b

Answer 10

a.

Question 11

11. Identify the term that describes how dark and light areas are differentiated on an image:
    a. contrast
    b. density
    c. intensity
    d. polychromatic

Answer 11

a.

Question 12

12. An image that has many light and dark areas with few shades of gray is said to have:
    a. high density
    b. low density
    c. high contrast
    d. low contrast

Answer 12

c.

Question 13

13. The image described in question 12 was produced with:
    a. low kilovoltage
    b. high kilovoltage
    c. low milliamperage
    d. high milliamperage

Answer 13

c.

Question 14

14. Increasing milliamperage alone results in an image with:
    a. high contrast
    b. low contrast
    c. increased density
    d. decreased density

Answer 14

c.

Question 15

15. The total energy contained in the x-ray beam in a specific area at a given time is termed:
    a. kilovoltage
    b. beam quality
    c. intensity
    d. milliampere-second

I

Answer 15

c.

Question 16

16. Increasing which of these four exposure controls will increase the intensity of the x-ray beam: (1) kilovoltage, (2) milliamperage, (3) exposure time, (4) source-to-receptor distance?
    a. 1 and 2
    b. 2 and 3
    c. 1, 2, and 3
    d. 1, 2, 3, and 4

Answer 16

c.

Question 17

17. If the target-receptor distance is doubled, the resultant beam will be:
    a. four times as intense
    b. twice as intense
    c. half as intense
    d. one fourth as intense

Answer 17

d.

Question 18

18. If the target-receptor distance is tripled, the resultant beam will be:
    a. one half as intense
    b. one fourth as intense
    c. one ninth as intense
    d. one sixteenth as intense

Answer 18

c.

Question 19

19. The half-value layer is the amount of:
    a. lead that restricts the diameter of the beam by half
    b. copper needed to cool the anode
    c. aluminum needed to reduce scatter radiation by half
    d. aluminum needed to reduce x-ray beam intensity by half

Answer 19

d.

Question 20

20. If the half-value layer is 3 mm, what thickness of aluminum is necessary to decrease the intensity by half?
    a. 1.5 mm
    b. 3 mm
    c. 6 mm
    d. 9 mm

Answer 20

b.