GXMO Radiographic Exposure Techniques

Question 1

Which exposure factor primarily controls the quality (penetrating power) of the x-ray beam?

Accepted Answer

kVp

Answer

mAs

Answer

Exposure time

Answer

Focal spot size

Question 2

Doubling the mAs while keeping all other factors constant will:

Accepted Answer

Double radiographic density

Answer

Halve patient dose

Answer

Increase image contrast

Answer

Reduce scatter radiation

Question 3

The '15% rule' states that increasing kVp by 15% requires what mAs adjustment to maintain the same density?

Accepted Answer

Halve the mAs

Answer

Double the mAs

Answer

Increase mAs by 15%

Answer

No mAs change needed

Question 4

What is the standard source-to-image distance (SID) used for PA chest radiographs?

Accepted Answer

72 inches

Answer

40 inches

Answer

48 inches

Answer

56 inches

Question 5

According to the inverse square law, if SID is doubled, x-ray beam intensity at the image receptor:

Accepted Answer

Decreases to one-quarter

Answer

Doubles

Answer

Quadruples

Answer

Decreases by half

Question 6

Which exposure factor has the GREATEST effect on radiographic contrast?

Accepted Answer

kVp

Answer

mAs

Answer

Focal spot size

Answer

SID

Question 7

Using a small focal spot instead of a large focal spot will primarily result in:

Accepted Answer

Improved recorded detail/sharpness

Answer

Increased radiographic density

Answer

Increased image contrast

Answer

Reduced patient dose