RAD 121 - FINAL EXAM RANDOM QUESTIONS WITH
VERIFIED ANSWERS
Projectile electrons are electrons that:
Select one:
a. travel from the negative terminal of the x-ray tube to the positive terminal to make up
tube current
b. travel from the positive terminal of the x-ray tube to the negative terminal to make up
tube current
c. are emitted from the x-ray tube, interact with body atoms, and subsequently result in
the formation of the radiographic image
d. never require aluminum-equivalent filtration because of their relatively low energy -
Answers - a
The variation in brightness and density on digital is the:
Select one:
a. density.
b. contrast.
c. SID.
d. brightness. - Answers - b
Approximately 20% of the primary x-ray beam actually reaches the image receptor.
Select one:
True
False - Answers - False
This is measured in cd/m2/mR/s.
Select one:
a. Brightness gain
b. Flux
c. Minification gain
d. Conversion factor - Answers - d
The actual area of the IR that is needed to define the VOI is determined by accurate
_________________
centering and good ____________________. - Answers - CR, collimation
As the angle of the anode target decreases, the:
Select one:
a. effective focal spot decreases
b. effective focal spot increases
c. actual focal spot increases
d. actual focal spot decreases - Answers - a
,Using an Agfa digital imaging system, if an image's exposure indicator is 2.3 lgM while
the optimal range begins at 2.6 lgM, this means that the IR was ______________ and
the exposure to the IR needs to be ___________________ .
Select one:
a. underexposed; increased by 30%
b. underexposed; increased by a factor of two
c. overexposed; decreased by 30%
d. overexposed; decreased by a factor of two - Answers - b
Which of the following will serve to increase the effective energy of the x-ray beam?
1. Increase in added filtration
2. Increase in kilovoltage
3. Increase in milliamperage
Select one:
a. 1 only
b. 2 only
c. 1 and 2 only
d. 1, 2, and 3 - Answers - c
When the entering x-ray photon loses energy and changes its path of travel as a result
of interacting with an atom, the interaction is known as the:
Select one:
a. compensating effect.
b. photoelectric interaction.
c. characteristic effect.
d. Compton effect. - Answers - d
The analog to digital converter:
Select one:
a. makes the electrical signal understandable to the computer.
b. determines the contrast resolution of the system.
c. determines the image matrix.
d. all of the above. - Answers - d
The x-ray beam used with a digital fluoroscopic unit uses ___________ mA and a
______________ beam.
Select one:
a. low; constant
b. high; constant
c. low; pulsed
d. high; pulsed - Answers - d
An acceptable abdominal radiograph was taken at 40 SID with a 10:1 bucky grid ratio. A
second exposure is made, with the only change being use of a 5:1 stationary grid. This
second radiograph will exhibit the following:
1. Greater density
, 2. Higher contrast
3. Longer scale of contrast
Select one:
a. 1 only
b. 1 and 2 only
c. 2 and 3 only
d. 1 and 3 only - Answers - d
The visibility of anatomic structures in a radiographic image is determined by:
Select one:
a. spatial resolution and image contrast.
b. brightness/density and image contrast.
c. spatial resolution and brightness/density.
d. all of the above. - Answers - b
Changes in kVp do not affect the digital exposure indicator.
Select one:
True
False - Answers - False
A grid error in which density is decreased across the entire radiograph is caused by:
Select one:
a. High kVp
b. Lateral decentering
c. Off-level grid
d. Grid-focus decentering - Answers - c
What effect does increasing filtration have on contrast?
Select one:
a. Increase contrast
b. Decrease contrast
c. No effect
d. Varying effect - Answers - b
All other factors remaining the same, if a 14 × 17-inch field is collimated to a 4-inch
square field, the radiographic image will demonstrate
Select one:
a. more density.
b. less density.
c. more detail.
d. less detail. - Answers - b
Target angle will have an effect on the:
1. severity of the heel effect
2. focal spot size
3. heat load capacity
VERIFIED ANSWERS
Projectile electrons are electrons that:
Select one:
a. travel from the negative terminal of the x-ray tube to the positive terminal to make up
tube current
b. travel from the positive terminal of the x-ray tube to the negative terminal to make up
tube current
c. are emitted from the x-ray tube, interact with body atoms, and subsequently result in
the formation of the radiographic image
d. never require aluminum-equivalent filtration because of their relatively low energy -
Answers - a
The variation in brightness and density on digital is the:
Select one:
a. density.
b. contrast.
c. SID.
d. brightness. - Answers - b
Approximately 20% of the primary x-ray beam actually reaches the image receptor.
Select one:
True
False - Answers - False
This is measured in cd/m2/mR/s.
Select one:
a. Brightness gain
b. Flux
c. Minification gain
d. Conversion factor - Answers - d
The actual area of the IR that is needed to define the VOI is determined by accurate
_________________
centering and good ____________________. - Answers - CR, collimation
As the angle of the anode target decreases, the:
Select one:
a. effective focal spot decreases
b. effective focal spot increases
c. actual focal spot increases
d. actual focal spot decreases - Answers - a
,Using an Agfa digital imaging system, if an image's exposure indicator is 2.3 lgM while
the optimal range begins at 2.6 lgM, this means that the IR was ______________ and
the exposure to the IR needs to be ___________________ .
Select one:
a. underexposed; increased by 30%
b. underexposed; increased by a factor of two
c. overexposed; decreased by 30%
d. overexposed; decreased by a factor of two - Answers - b
Which of the following will serve to increase the effective energy of the x-ray beam?
1. Increase in added filtration
2. Increase in kilovoltage
3. Increase in milliamperage
Select one:
a. 1 only
b. 2 only
c. 1 and 2 only
d. 1, 2, and 3 - Answers - c
When the entering x-ray photon loses energy and changes its path of travel as a result
of interacting with an atom, the interaction is known as the:
Select one:
a. compensating effect.
b. photoelectric interaction.
c. characteristic effect.
d. Compton effect. - Answers - d
The analog to digital converter:
Select one:
a. makes the electrical signal understandable to the computer.
b. determines the contrast resolution of the system.
c. determines the image matrix.
d. all of the above. - Answers - d
The x-ray beam used with a digital fluoroscopic unit uses ___________ mA and a
______________ beam.
Select one:
a. low; constant
b. high; constant
c. low; pulsed
d. high; pulsed - Answers - d
An acceptable abdominal radiograph was taken at 40 SID with a 10:1 bucky grid ratio. A
second exposure is made, with the only change being use of a 5:1 stationary grid. This
second radiograph will exhibit the following:
1. Greater density
, 2. Higher contrast
3. Longer scale of contrast
Select one:
a. 1 only
b. 1 and 2 only
c. 2 and 3 only
d. 1 and 3 only - Answers - d
The visibility of anatomic structures in a radiographic image is determined by:
Select one:
a. spatial resolution and image contrast.
b. brightness/density and image contrast.
c. spatial resolution and brightness/density.
d. all of the above. - Answers - b
Changes in kVp do not affect the digital exposure indicator.
Select one:
True
False - Answers - False
A grid error in which density is decreased across the entire radiograph is caused by:
Select one:
a. High kVp
b. Lateral decentering
c. Off-level grid
d. Grid-focus decentering - Answers - c
What effect does increasing filtration have on contrast?
Select one:
a. Increase contrast
b. Decrease contrast
c. No effect
d. Varying effect - Answers - b
All other factors remaining the same, if a 14 × 17-inch field is collimated to a 4-inch
square field, the radiographic image will demonstrate
Select one:
a. more density.
b. less density.
c. more detail.
d. less detail. - Answers - b
Target angle will have an effect on the:
1. severity of the heel effect
2. focal spot size
3. heat load capacity
