RADT 146 ACTUAL TEST QUESTIONS WITH
COMPLETE ANSWER KEY
●● _________ produce radiographs by way of operating equipment that
produce x-rays
Answer: Technologist
●● Must be skilled in the use of _______ factors that consistently
produce good radiographs
Answer: technique
●● technique
Answer: the systematic procedure to
produce a high-quality radiograph. It includes the ability to select
appropriate factors to produce an x-ray beam that will adequately
penetrate the body part and provide the appropriate level of blackening
(density) and
subject contrast on the image
●● Factors governing density
Answer: Kilovoltage (kV), Milliampereseconds (mAs), Distance
●● Kilovoltage
,Answer: • The force that accelerates the electrons from cathode to anode
• The energy or quality of the
x-ray beam is determined by
the kV selected
●● X-rays travel through matter in a
Answer: wave-like fashion
●● Wavelength
Answer: the distance from one crest of the wave to the crest of the next
wave
●● An increase in kV will produce x-rays photons of
Answer: shorter wavelength
●● An increase in kV produces
more x-ray photons having
Answer: higher energy levels
●● Penetrometer
Answer: • As kV increases, so will its penetrating ability, which
increases the amount of
radiation reaching the image receptor
,• This will produce more density on the image
●● 15% Rule: an increase in kV by 15% will result in doubling the
amount of overall blackening or density on the image
Example #1:
• A radiograph is made using 70 kV. After review of the
image, the decision was made to increase the overall
density of the image. To achieve this, the second
exposure was done using 81 kV
Answer: 15% = 0.15
0.15 x 70 kV = 10.5
70 kV + 10.5 = 80.5 ----> 81 kV
●● A decrease in kV by 15% will reduce the overall density of the image
by one half
Example #2:
Answer: 0.15 x 70 kV = 10.5
70 kV - 10.5 = 59.5 ----> 60 kV
●● The 15% rule is a _______ and _______ relationship. However, it
serves the technologist well as a practical tool when changes in kV are
necessary in order to control the amount of exposure to the image
Answer: nonlinear and nonproportional
, ●● Penetration of the part
Answer: Means the x-ray photons have sufficient energy to pass through
the part and emerge
as remnant radiation
●● kV selected based on average body part thickness
Answer: • Chest 110 kV
• Abdomen 70 kV
• Upper extremity 60 kV
●● kV is a factor in the production of scatter radiation
Answer: - As x-ray photons strike the body part, especially with higher
kV's, the x-ray photons undergo a change in direction
- Occurs at the atomic level
- X-ray photon travel in a direction different from its original "straight-
line" path
• Scatter radiation exits the body traveling in many directions with
different energy levels
• Scatter radiation is a danger to the patient and the technologist
• It is a detriment to image quality
●● Higher kV
COMPLETE ANSWER KEY
●● _________ produce radiographs by way of operating equipment that
produce x-rays
Answer: Technologist
●● Must be skilled in the use of _______ factors that consistently
produce good radiographs
Answer: technique
●● technique
Answer: the systematic procedure to
produce a high-quality radiograph. It includes the ability to select
appropriate factors to produce an x-ray beam that will adequately
penetrate the body part and provide the appropriate level of blackening
(density) and
subject contrast on the image
●● Factors governing density
Answer: Kilovoltage (kV), Milliampereseconds (mAs), Distance
●● Kilovoltage
,Answer: • The force that accelerates the electrons from cathode to anode
• The energy or quality of the
x-ray beam is determined by
the kV selected
●● X-rays travel through matter in a
Answer: wave-like fashion
●● Wavelength
Answer: the distance from one crest of the wave to the crest of the next
wave
●● An increase in kV will produce x-rays photons of
Answer: shorter wavelength
●● An increase in kV produces
more x-ray photons having
Answer: higher energy levels
●● Penetrometer
Answer: • As kV increases, so will its penetrating ability, which
increases the amount of
radiation reaching the image receptor
,• This will produce more density on the image
●● 15% Rule: an increase in kV by 15% will result in doubling the
amount of overall blackening or density on the image
Example #1:
• A radiograph is made using 70 kV. After review of the
image, the decision was made to increase the overall
density of the image. To achieve this, the second
exposure was done using 81 kV
Answer: 15% = 0.15
0.15 x 70 kV = 10.5
70 kV + 10.5 = 80.5 ----> 81 kV
●● A decrease in kV by 15% will reduce the overall density of the image
by one half
Example #2:
Answer: 0.15 x 70 kV = 10.5
70 kV - 10.5 = 59.5 ----> 60 kV
●● The 15% rule is a _______ and _______ relationship. However, it
serves the technologist well as a practical tool when changes in kV are
necessary in order to control the amount of exposure to the image
Answer: nonlinear and nonproportional
, ●● Penetration of the part
Answer: Means the x-ray photons have sufficient energy to pass through
the part and emerge
as remnant radiation
●● kV selected based on average body part thickness
Answer: • Chest 110 kV
• Abdomen 70 kV
• Upper extremity 60 kV
●● kV is a factor in the production of scatter radiation
Answer: - As x-ray photons strike the body part, especially with higher
kV's, the x-ray photons undergo a change in direction
- Occurs at the atomic level
- X-ray photon travel in a direction different from its original "straight-
line" path
• Scatter radiation exits the body traveling in many directions with
different energy levels
• Scatter radiation is a danger to the patient and the technologist
• It is a detriment to image quality
●● Higher kV
