Ch. 32

Question 1

Most CR readers scan the plate in which direction?

Answer 1

They scan the entire plate from the center outwards

Question 2

Most DR systems generally scan in which direction?

Answer 2

They scan only the exposed area in a linear progression

Question 3

To help the computer make the distinction between bones and areas between the collimated fields what 3 things need to be considered?

Answer 3

1. The body part must be centered well within each exposure field.
2. All collimation must be parallel to and equidistant from the edges of the imaging plate.
3. Collimated fields must be well- separated from each other.

Question 4

For CR, exposure indicator errors are likely unless as least what percent of the plate is exposed?

Answer 4

30%

Question 5

What are two ways to prevent clipping the bottom edge of the field when doing a cross table projection?

Answer 5

1. Tape a one-inch strip of lead to the bottom of the cassette
2. Build up the patient to where the collimated field can be vertically centered to the cassette