Chapter 7

Question 1

The function of a filter is to remove what from the x-ray beam?

Answer 1

Long wavelength radiation

Question 2

To within what percent of the SID must the collimator light and actual irradiated area be accurate?

Answer 2

2%

Question 3

The greatest beam limitation is accomplished when the cone/cylinder is _____, and the diameter opening is _____.

Answer 3

longer; smaller

Question 4

How much total filtration is required when using over 70 kVp?

Answer 4

2.5 mm of aluminum equivalent

Question 5

The number of repeat radiographs can be reduced by

Answer 5

Illuminating voluntary patient motion using immobilization devices

Question 6

Using CR, it is estimated that overexposures of up to _____, and underexposures up to _____ are recoverable, thus eliminating the need for retakes.

Answer 6

500%; 80%

Question 7

An effective way of reducing patient dose is through

Answer 7

Accurate and effective positioning

Question 8

Causes of repeat radiographs include the following:

Answer 8

• Dirty screens
• Incorrectly loaded cassettes
• Light leaks
• Chemical fog
• Processor artifacts