Test 4 - Book questions

Question 1

Which of the following describes the process of radiographic image formation?
a. beam attenuation
b. differential absorption
c. dynamic imaging
d. ionization

Answer 1

b. differential absorption

Question 2

the x-ray interaction with anatomic tissue that is responsible for scattering is:
a. ionization.
b. photoelectric.
c. Compton.
d. absorption.

Answer 2

c. Compton.

Question 3

Which of the following will increase beam attenuation?
a. higher kilovoltage
b. decreasing tissue density
c. thicker anatomic part
d. lower atomic number

Answer 3

c. thicker anatomic part

Question 4

Factors that decrease x-ray absorption include:
a. increased tissue density.
b. increased x-ray beam quality.
c. increased tissue thickness.
d. increased atomic number.

Answer 4

b. increased x-ray beam quality.

Question 5

Which of the following will decrease the amount of scatter radiation produced?
a. increasing the x-ray field size
b. decreasing the x-ray field size
c. increasing the grid ratio
d. decreasing the grid ratio

Answer 5

b. decreasing the x-ray field size

Question 6

Which of the following is not a type of beam restrictor?
a. aperture diaphragm
b. positive beam-limiting device
c. cylinder
d. lead shield

Answer 6

d. lead shield

Question 7

As collimation decreases, the quantity of scatter radiation
decreases.
a. True
b. False

Answer 7

b. False

Question 8

What type of beam-restricting device provides the most flexibility in adjusting the x-ray field size?
a. cylinder
b. aperture diaphragm
c. collimator
d. cone

Answer 8

c. collimator

Question 9

What describes the number of lead lines per unit length?
a. grid frequency
b. grid pattern
c. grid convergent point
d. grid ratio

Answer 9

a. grid frequency

Question 10

A radiographic image was created using a 12:1 grid and 70 kVp at 10 mAs. What exposure technique change would maintain a similar exposure to the image receptor when converting to a 6:1 ratio grid? (GCF1 = 5, GCF2 = 3)
a. 81 kVp at 5 mAs
b. 70 kVp at 16.7 mAs
c. 70 kVp at 6 mAs
d. 60 kVp at 20 mAs

Answer 10

c. 70 kVp at 6 mAs

Question 11

What type of grid has lead strips running parallel to the long axis of the grid?
a. focused
b. short dimension
c. cross hatched
d. long dimension

Answer 11

d. long dimension

Question 12

Angling the x-ray tube along the long axis of a crossed grid would result in:
a. increased scatter absorption.
b. grid cutoff.
c. Moiré effect.
d. lateral decentering.

Answer 12

b. grid cutoff.

Question 13

For the air gap technique to be effective in reducing scatter radiation reaching the image receptor, what must be increased?
a. SID
b. focal spot size
c. kVp
d. OID

Answer 13

d. OID

Question 14

With exposure technique compensation, _____ the grid ratio will _____ patient radiation exposure.
a. decreasing, increase
b. increasing, decrease
c. increasing, increase
d. decreasing, will not affect

Answer 14

c. increasing, increase