Principles of Radiographic Imaging
Final Exam Review-Graded A
400mA x _____ = 60 mAs
A) 6.6 s
B) .15 s
C) .6 s
D) .4 s - correct Answer-.15 seconds
Which of the primary factors is considered the controlling factor of the quality of the x-
ray beam?
A) mAs
B) time
C) mA
D) kVp - correct Answer-kVp
What primary factor is responsible for the amount of energy of the x-ray beam? - correct
Answer-kVp
What is the intensity of an x-ray beam that has technical factors of 300 mA and 0.2 sec?
A) 60 mAs
B) 6.0 mAs
C) 0.0006 mAs
D) 1,500 mAs - correct Answer-60 mAs
Which of the following collimation settings will demonstrate the most uniform beam
intensity within the exposure field?
A. 6 x 6 inches
B. 8 x 10 inches
C. 10 x 12 inches
D. 17 x 17 inches - correct Answer-6 x 6 inches
Using a smaller field size results in an x-ray beam of more uniform intensity. The beam
is NOT focused or concentrated, but increasing the collimation removes the extreme
edges of the x-ray field where there are very large differences in intensity.
An x-ray exposure was made with 75 kVp & 5 mAs. What kVp setting would half the
amount of exposure to IR, while maintaining a constant mAs?
A) 64 kVp
B) 80 kVp
C) 60 kVp
,D) 86 kVp - correct Answer-64 kVp
What describes the decrease in the intensity of an x-ray beam due to photon
interactions with tissues?
A) attenuation
B) magnification
C) absorption
D) filtration - correct Answer-Attenuation
What primary factor is responsible for giving "contrast" in the x-ray image?
A) mAs
B) time
C) kVp
D) mA - correct Answer-kVp
What primary factor is responsible for the intensity of an x-ray beam?
A) mAs
B) Time
C) kVp
D) mA - correct Answer-mAs
If you were to increase the time of an exposure, what would you need to do to the mA to
maintain the same exposure levels to the IR? - correct Answer-Lower the mA using the
Law of Reciprocity.
What percentage of kVp difference will be equivalent to doubling or halving the mAs of a
previous technique?
A) 15%
B) 30%
C) 25%
D) 10% - correct Answer-15%
Which of the following describes the x-ray photons between the patient and IR?
A) remnant radiation
B) primary radiation
C) latent radiation
D) secondary (scattered) radiation - correct Answer-Remnant Radiation
Which type of AEC is more sophisticated and accurate to use?
A) back up timer
B) minimum response time
C) ionization chamber
D) phototimer - correct Answer-Phototimer
The minimum response time for most modern AEC systems is ____.
A) 1 ms
, B) 0.5 s
C) 1 s
D) 5 ms - correct Answer-1 ms
Which type of AEC converts light into an electrical signal that is sent to the timer? -
correct Answer-Phototimer
Which type of AEC is considered an entrance type?
A) ionization chambers
B) back up timer
C) phototimers
D) minimal response time - correct Answer-Ionization Chambers
A high contrast image will have what type of grayscale? - correct Answer-Short Gray
Scale
Which x-ray photon to tissue interaction results in an ejected electron and a change in
direction of photon with lower energy?
A) photoelectric effect
B) characteristic effect
C) compton effect
D) coherent effect - correct Answer-Compton Effect
Which of the following will increase beam attenuation?
1. higher kVp
2. thicker tissue
3. less dense tissue
4. barium contrast
A) 1 & 3
B) all of them
C) 2, 3, & 4
D) 2 & 4 - correct Answer-2 & 4
Compton effect is responsible for giving necessary subject contrast information to the
image.
A) True
B) False - correct Answer-False
Which type of AEC is found between patient and image receptor?
A) ionization chamber
B) photodiode
C) phototimer
D) back up timer - correct Answer-Ionization Chamber
Final Exam Review-Graded A
400mA x _____ = 60 mAs
A) 6.6 s
B) .15 s
C) .6 s
D) .4 s - correct Answer-.15 seconds
Which of the primary factors is considered the controlling factor of the quality of the x-
ray beam?
A) mAs
B) time
C) mA
D) kVp - correct Answer-kVp
What primary factor is responsible for the amount of energy of the x-ray beam? - correct
Answer-kVp
What is the intensity of an x-ray beam that has technical factors of 300 mA and 0.2 sec?
A) 60 mAs
B) 6.0 mAs
C) 0.0006 mAs
D) 1,500 mAs - correct Answer-60 mAs
Which of the following collimation settings will demonstrate the most uniform beam
intensity within the exposure field?
A. 6 x 6 inches
B. 8 x 10 inches
C. 10 x 12 inches
D. 17 x 17 inches - correct Answer-6 x 6 inches
Using a smaller field size results in an x-ray beam of more uniform intensity. The beam
is NOT focused or concentrated, but increasing the collimation removes the extreme
edges of the x-ray field where there are very large differences in intensity.
An x-ray exposure was made with 75 kVp & 5 mAs. What kVp setting would half the
amount of exposure to IR, while maintaining a constant mAs?
A) 64 kVp
B) 80 kVp
C) 60 kVp
,D) 86 kVp - correct Answer-64 kVp
What describes the decrease in the intensity of an x-ray beam due to photon
interactions with tissues?
A) attenuation
B) magnification
C) absorption
D) filtration - correct Answer-Attenuation
What primary factor is responsible for giving "contrast" in the x-ray image?
A) mAs
B) time
C) kVp
D) mA - correct Answer-kVp
What primary factor is responsible for the intensity of an x-ray beam?
A) mAs
B) Time
C) kVp
D) mA - correct Answer-mAs
If you were to increase the time of an exposure, what would you need to do to the mA to
maintain the same exposure levels to the IR? - correct Answer-Lower the mA using the
Law of Reciprocity.
What percentage of kVp difference will be equivalent to doubling or halving the mAs of a
previous technique?
A) 15%
B) 30%
C) 25%
D) 10% - correct Answer-15%
Which of the following describes the x-ray photons between the patient and IR?
A) remnant radiation
B) primary radiation
C) latent radiation
D) secondary (scattered) radiation - correct Answer-Remnant Radiation
Which type of AEC is more sophisticated and accurate to use?
A) back up timer
B) minimum response time
C) ionization chamber
D) phototimer - correct Answer-Phototimer
The minimum response time for most modern AEC systems is ____.
A) 1 ms
, B) 0.5 s
C) 1 s
D) 5 ms - correct Answer-1 ms
Which type of AEC converts light into an electrical signal that is sent to the timer? -
correct Answer-Phototimer
Which type of AEC is considered an entrance type?
A) ionization chambers
B) back up timer
C) phototimers
D) minimal response time - correct Answer-Ionization Chambers
A high contrast image will have what type of grayscale? - correct Answer-Short Gray
Scale
Which x-ray photon to tissue interaction results in an ejected electron and a change in
direction of photon with lower energy?
A) photoelectric effect
B) characteristic effect
C) compton effect
D) coherent effect - correct Answer-Compton Effect
Which of the following will increase beam attenuation?
1. higher kVp
2. thicker tissue
3. less dense tissue
4. barium contrast
A) 1 & 3
B) all of them
C) 2, 3, & 4
D) 2 & 4 - correct Answer-2 & 4
Compton effect is responsible for giving necessary subject contrast information to the
image.
A) True
B) False - correct Answer-False
Which type of AEC is found between patient and image receptor?
A) ionization chamber
B) photodiode
C) phototimer
D) back up timer - correct Answer-Ionization Chamber
