Contrast

Question 1

Low kVp and high mAs leads to what type of scale: short or long?

Answer 1

Short scale

Question 2

Which presents with high contrast: short or long scale?

Answer 2

Short

Question 3

High kVp and low mAs leads to what type of scale: short or long?

Answer 3

Long scale

Question 4

Which presents with low contrast: short or long scale?

Answer 4

Long

Question 5

Does a long or short scale appear very black and white?

Answer 5

Short

Question 6

Does a long or short scale appear very dull and gray?

Answer 6

Long

Question 7

How is density affected if kVp is increased by 15% aka 10 kVp (the 15% kVp rule)?

Answer 7

Density will double

Question 8

How is density affected if kVp is decreased by 15% aka 10 kVp (the 15% kVp rule)?

Answer 8

Density will be cut in half

Question 9

How can underexposure be fixed by altering kVp?

Answer 9

Increased kVp by 15%

Question 10

How can overexposure be fixed by altering kVp?

Answer 10

Decreasing kVp by 15%

Question 11

A 15% decrease in kVp has the same affect on density as what change of mAs?

Answer 11

50% decrease

Question 12

What is the difference between recorded detail and visible detail?

Answer 12

Recorded - degree to which the BORDERS of an object are clearly defined
Visible - how clearly seen an object appears on film

Question 13

What things can affect recorded detail?

Answer 13

Patient motion, FFD, OFD, focal spot size, tube-part-film alignment

Question 14

How can patient motion be controlled?

Answer 14

1 patient stabilization

2 keeping exposure time short

Question 15

How does patient motion affect the image?

Answer 15

Blurring

Question 16

What kind of FFD results in less magnification distortion?

Answer 16

Longer tube distance (FFD)

Question 17

What specific FFD yields better detail and less magnification?

Answer 17

72” (compared to 40”)

Question 18

Does an object closer to or farther away from the film create more magnification distortion?

Answer 18

Farther away

Question 19

How does magnification affect recorded detail?

Answer 19

Decreases it

Question 20

What type of focal spot produces better detail: large or small?

Answer 20

Small

Question 21

Regarding the tube/patient/film alignment, what must occur to avoid distortion and loss of detail?

Answer 21

Objects must be perpendicular to the central ray or parallel to the film

Question 22

What structure must be parallel to the film to avoid true/angular distortion?

Answer 22

Object

Question 23

What structure must be perpendicular to the object and film to avoid true/angular distortion?

Answer 23

Central ray