FDI FINAL EXAM REVIEW QUESTIONS AND ANSWERS
What does is mean when an image has high contrast? - CORRECT ANSWER✅✅✅kVp is too low
short gray scale
image has a lot of black and white
How do you fix a high contrast image? - CORRECT ANSWER✅✅✅increase kVp
decrease mAs (so density stays the same)
What does is mean when an image has low contrast? - CORRECT ANSWER✅✅✅kVp it too high
long gray scale
many shades of gray in image
How do you fix a low contrast image? - CORRECT ANSWER✅✅✅lower kVp
increase mAs (so density stays the same)
What does it mean when an image has too much density? - CORRECT ANSWER✅✅✅mAs is too high
overexposed image (too dark)
How do you fix an overexposed image? - CORRECT ANSWER✅✅✅decrease mAs by half
*do not adjust kVp*
What does it mean when an image does not have enough density? - CORRECT ANSWER✅✅✅mAs is
too low
underexposed image (too light)
How do you fix an underexposed image? - CORRECT ANSWER✅✅✅double mAs
*do not adjust kVp*
, What images would you want a low contrast (long gray scale) image? - CORRECT
ANSWER✅✅✅chest x-rays. want to be able to see subtleties in chest and lung.
X-ray beam has greater intensity on the cathode side of the tube but a lower intensity towards the
anode side - CORRECT ANSWER✅✅✅anode heel effect
what are three take aways from the anode heel effect? - CORRECT ANSWER✅✅✅place thicker part
of bodies toward cathode
less noticeable with larger FFD's
less noticeable with larger films
what does filtration do? - CORRECT ANSWER✅✅✅decrease intensity of x-ray beam & decrease pt.
dosage
What should you identify from a radiograph taken without a phosphor screen? - CORRECT
ANSWER✅✅✅grossly underexposed to the point that the air density is not even black.
What are the benefits of a fast-speed phosphor screen? - CORRECT ANSWER✅✅✅large phosphor
crystals give off more visible light giving more exposure. in a stepwedge, you would be able to see every
step.
Which gives the most x-ray exposure?
A. no phosphor screen
B. slow speed screen
C. fast speed screen - CORRECT ANSWER✅✅✅no phosphor screen
Which gives the least x-ray exposure?
A. no phosphor screen
B. slow speed screen
C. fast speed screen - CORRECT ANSWER✅✅✅fast speed screen
What does is mean when an image has high contrast? - CORRECT ANSWER✅✅✅kVp is too low
short gray scale
image has a lot of black and white
How do you fix a high contrast image? - CORRECT ANSWER✅✅✅increase kVp
decrease mAs (so density stays the same)
What does is mean when an image has low contrast? - CORRECT ANSWER✅✅✅kVp it too high
long gray scale
many shades of gray in image
How do you fix a low contrast image? - CORRECT ANSWER✅✅✅lower kVp
increase mAs (so density stays the same)
What does it mean when an image has too much density? - CORRECT ANSWER✅✅✅mAs is too high
overexposed image (too dark)
How do you fix an overexposed image? - CORRECT ANSWER✅✅✅decrease mAs by half
*do not adjust kVp*
What does it mean when an image does not have enough density? - CORRECT ANSWER✅✅✅mAs is
too low
underexposed image (too light)
How do you fix an underexposed image? - CORRECT ANSWER✅✅✅double mAs
*do not adjust kVp*
, What images would you want a low contrast (long gray scale) image? - CORRECT
ANSWER✅✅✅chest x-rays. want to be able to see subtleties in chest and lung.
X-ray beam has greater intensity on the cathode side of the tube but a lower intensity towards the
anode side - CORRECT ANSWER✅✅✅anode heel effect
what are three take aways from the anode heel effect? - CORRECT ANSWER✅✅✅place thicker part
of bodies toward cathode
less noticeable with larger FFD's
less noticeable with larger films
what does filtration do? - CORRECT ANSWER✅✅✅decrease intensity of x-ray beam & decrease pt.
dosage
What should you identify from a radiograph taken without a phosphor screen? - CORRECT
ANSWER✅✅✅grossly underexposed to the point that the air density is not even black.
What are the benefits of a fast-speed phosphor screen? - CORRECT ANSWER✅✅✅large phosphor
crystals give off more visible light giving more exposure. in a stepwedge, you would be able to see every
step.
Which gives the most x-ray exposure?
A. no phosphor screen
B. slow speed screen
C. fast speed screen - CORRECT ANSWER✅✅✅no phosphor screen
Which gives the least x-ray exposure?
A. no phosphor screen
B. slow speed screen
C. fast speed screen - CORRECT ANSWER✅✅✅fast speed screen
