Quick Review

Question 1

What concept controls the film’s overall darkness?

Answer 1

Density

Question 2

What measurement primarily controls density?

Answer 2

mAs (mA X s)

Question 3

What effect does increased mA, s, and/or mAs have on density?

Answer 3

Increased density

Question 4

What kind of patient will require more mAs and why: smaller or larger patient?

Answer 4

Larger patient due to increase in tissue thickness

Question 5

What effect does an increase in distance (SID/FFD) have on density?

Answer 5

Decreased density (rule of 3)

Question 6

What effect does increased kVp have on density?

Answer 6

Increased density (due to increased scatter which adds more gray to the film therefore increasing overall darkness)

Question 7

Which kind of screen requires more mAs to make them fluoresce: 200 speed or 400 speed?

Answer 7

200 speed (smaller)

Question 8

What is the purpose of a grid?

Answer 8

Clean up scatter

Question 9

When using a grid, what measurement must be increased and why?

Answer 9

mAs because the grid takes away levels of scatter (grays) thus takes away some color which takes away darkness

Question 10

Why do we not increase kVp when using a grid?

Answer 10

Increases scatter production (which is what we are trying to get rid of)

Question 11

What effect does both too much developer and being in the developer for too long have on density?

Answer 11

Increased density

Question 12

What is the purpose of filtration?

Answer 12

Even out radiographic density

Question 13

When x-raying a part with two different thicknesses, a filter is used to cover what part?

Answer 13

Thin part

Question 14

What is the term for the varying shades of gray on a radiograph?

Answer 14

Contrast

Question 15

What measurement primarily controls contrast?

Answer 15

kVp

Question 16

What are the functions of kVp?

Answer 16

1 power in the x-ray bundle
2 brings anatomy to the film
3 causes scatter

Question 17

Which scale is associated with low contrast and is a result of using high kVp: long or short scale?

Answer 17

Long

Question 18

Which scale is associated with high contrast and is a result of using low kVp: long or short scale?

Answer 18

Short

Question 19

Which presents as a very black and white film: short or long scale?

Answer 19

Short

Question 20

Which presents as a very dull, gray film: short or long scale?

Answer 20

Long

Question 21

What structure is used when tissue thickness is 11 cm or greater to prevent scatter?

Answer 21

Grid

Question 22

Altering what measurement is required when a grid is used to remove scatter?

Answer 22

mAs

Question 23

What kind of grid ratio causes more scatter: low or high?

Answer 23

High grid ratio

Question 24

What term is used to explain how well represented the anatomy is radiographically aka crispness of the film?

Answer 24

Detail

Question 25

At what distance do we see the best detail?

Answer 25

SID/FFD of 72"

Question 26

What is the issue with the tube being close to the object?

Answer 26

Magnification (less definition)

Question 27

What is the ideal OFD to prevent magnification and destruction of detail?

Answer 27

Have part as close to film as possible

Question 28

How does density affect detail?

Answer 28

Increased density = decreased detail (film will be too dark to see anatomy

Question 29

Which scale decreases detail: short or long scale?

Answer 29

Long scale (too gray to see anatomy)

Question 30

Would increased or decreased developer lead to decreased detail?

Answer 30

Increased developer (because it increases density and visibility)

Question 31

How can tube tilt affect detail?

Answer 31

Wrong tube tube results in loss of detail (or not using tube tilt when required)