Radiation Biology Chapter 7 Questions and
Answers| Guaranteed Success
1. To within what percent of the SID must the collimator light and actual irradiated area be
accurate?
a. 2% c. 10%
b. 5% d. 25% ANS: A
2. The greatest beam limitation is accomplished when the cone/cylinder is _____, and the
diameter opening is _____.
a. shorter, bigger c. longer, bigger
b. shorter, smaller d. longer, smaller ANS: D
2. How much total filtration is required when using over 70 kVp?
a. 1.5 mm A c. 3.0 mm Al
b. 2.5 mm Al d. 4.0 mm Al ANS: B
3. Which of the following exposure techniques will provide the least amount of radiation
exposure to the patient?
a. 50 mAs, 90 kVp c. 200 mAs, 50 kVp
b. 100 mAs, 90 kVp d. 400 mAs, 50 kVp ANS: A
4. Which of the following will best reduce radiation exposure to the patient?
a. use non-screen film c. decrease kVp
b. use rare-earth screens d. increase mAs ANS: B
5. The number of repeat radiographs can be reduced by
a. disregarding communication between patient and radiographer
, b. eliminating voluntary patient motion using short exposure times
c. eliminating involuntary patient motion using immobilization devices
d. eliminating voluntary patient motion using immobilization devices ANS: D
6. The tabletop exposure rate during fluoroscopy shall not exceed
a. 1 R/min c. 7 R/min
b. 5 R/min d. 10 R/min ANS: D
7. Half-value layer (HVL) is defined as the thickness of a designated absorber required to
a. decrease the intensity of the primary beam by 50% of its initial value
b. decrease the intensity of the primary beam by 25% of its initial value
c. increase the intensity of the primary beam by 50% of its initial value
d. increase the intensity of the primary beam by 25% of its initial value ANS: A
8. The fundamental difference between computed radiography and conventional analog
imaging is the replacement of film-screens with
a. thermoluminescent dosimeters
b. optically stimulated luminescent dosimeters
c. photostimulable phosphor plates
d. rare-earth stimulated plates ANS: C
9. A computed radiography (CR) system includes the following:
1. storage phosphor cassettes
2. a storage phosphor reader
3. bar code scanner
4. remote operator panel for entering patient date
5. a clinical workstation for reviewing and printing
Answers| Guaranteed Success
1. To within what percent of the SID must the collimator light and actual irradiated area be
accurate?
a. 2% c. 10%
b. 5% d. 25% ANS: A
2. The greatest beam limitation is accomplished when the cone/cylinder is _____, and the
diameter opening is _____.
a. shorter, bigger c. longer, bigger
b. shorter, smaller d. longer, smaller ANS: D
2. How much total filtration is required when using over 70 kVp?
a. 1.5 mm A c. 3.0 mm Al
b. 2.5 mm Al d. 4.0 mm Al ANS: B
3. Which of the following exposure techniques will provide the least amount of radiation
exposure to the patient?
a. 50 mAs, 90 kVp c. 200 mAs, 50 kVp
b. 100 mAs, 90 kVp d. 400 mAs, 50 kVp ANS: A
4. Which of the following will best reduce radiation exposure to the patient?
a. use non-screen film c. decrease kVp
b. use rare-earth screens d. increase mAs ANS: B
5. The number of repeat radiographs can be reduced by
a. disregarding communication between patient and radiographer
, b. eliminating voluntary patient motion using short exposure times
c. eliminating involuntary patient motion using immobilization devices
d. eliminating voluntary patient motion using immobilization devices ANS: D
6. The tabletop exposure rate during fluoroscopy shall not exceed
a. 1 R/min c. 7 R/min
b. 5 R/min d. 10 R/min ANS: D
7. Half-value layer (HVL) is defined as the thickness of a designated absorber required to
a. decrease the intensity of the primary beam by 50% of its initial value
b. decrease the intensity of the primary beam by 25% of its initial value
c. increase the intensity of the primary beam by 50% of its initial value
d. increase the intensity of the primary beam by 25% of its initial value ANS: A
8. The fundamental difference between computed radiography and conventional analog
imaging is the replacement of film-screens with
a. thermoluminescent dosimeters
b. optically stimulated luminescent dosimeters
c. photostimulable phosphor plates
d. rare-earth stimulated plates ANS: C
9. A computed radiography (CR) system includes the following:
1. storage phosphor cassettes
2. a storage phosphor reader
3. bar code scanner
4. remote operator panel for entering patient date
5. a clinical workstation for reviewing and printing
