Unit 4/5

Primary Radiation

• Radiation exiting the window of the tube

• Radiation produced after primary interacts
  with patient (scatter is a secondary form)

• Radiation exiting the tube housing

• Radiation exiting the patient; consists of
  primary and secondary radiation

Secondary Radiation

• Radiation exiting the window of the tube

• Radiation produced after primary interacts
  with patient (scatter is a secondary form)

• Radiation exiting the tube housing

• Radiation exiting the patient; consists of
  primary and secondary radiation

Leakage Radiation

• Radiation exiting the window of the tube

• Radiation produced after primary interacts
  with patient (scatter is a secondary form)

• Radiation exiting the tube housing

• Radiation exiting the patient; consists of
  primary and secondary radiation

Remnant Radiation

• Radiation exiting the window of the tube

• Radiation produced after primary interacts
  with patient (scatter is a secondary form)

• Radiation exiting the tube housing

• Radiation exiting the patient; consists of
  primary and secondary radiation

Increase scatter radiation –

Image appears ____

• decrease
  contrast

• gray and dull

• increase contrast

• white

2 Major factors affect the amount of scatter radiation produced.

• The volume of the tissue irradiated

• kVp

• mAs

• collimation

Higher kVp

• more scatter

• less scatter

• equal amount of scatter

Beam Restriction or Collimation
More beam restriction/smaller collimation

• more scatter

• less scatter

• equal amount of scatter

Beam Restriction or Collimation
More beam restriction/smaller collimation

• more scatter

• less scatter

• equal amount of scatter

Patient Size
Larger patient

• more scatter

• less scatter

• equal amount of scatter