Unit 8

Question 1

IGRT

Answer 1

Image the patient right before treatment and compare the position of external setup marks and internal anatomy (iso)

Question 2

MLCs

Answer 2

Collimator leaves that slide into place to further define the field and customize the shape around the target

Question 3

Wedge angle

Answer 3

Angle which an isocurve is tilted at CAX at a specific depth

Question 4

Reference Image Verification

Answer 4

Taken at the start of treatment to verify correct patient position and anatomy

Question 5

Electronic Portal Imaging

Answer 5

Verifying/ documenting accuracy of treatment
-kV

Question 6

On-Board Imaging

Answer 6

mV: displays field shape
kV: imaging: orthogs to verify iso placement

Question 7

BEV Portal Reference Images

Answer 7

-check for correct ISO placement
-Identification and orientation of field

Question 8

CBCT

Answer 8

-no slices
-Not diagnostic (iso)

Question 9

Weekly Portal Imaging

Answer 9

-Single or double exposure
-Used for unstable localization landmarks and to check the proximity of the treatment volume to critical structures (iso)

Question 10

Orthogs

Answer 10

• Used to verify iso placement
  kV