cervical cancer: planning

Question 1

Energy
beam orientation

Answer 1

-15MV
-RT LAT= 270 , coll @ 90
LF LAT=90 , coll @ 90

Question 2

4 field box , therefore

Answer 2

choose any field and click “align field to isocentre group”
then pick PTV

round off x and z coordinates

Question 3

create a new reference point

Answer 3

-RC ref point in tab
-“new ref point and location”…. patient volume=PTV
-change ID to new ref point

-go to reference point organizer and remove old reference point
-move new reference point to isocentre by RC reference point in tab

Question 4

weighting

Answer 4

likely to have light weight on post field

Question 5

MLC
PA/AP

Answer 5

tighter margin at R/L
x1 and x2 = 0.5
y1 and y2= 1

Question 6

MLC
RT LAT / LF LAT

Answer 6

tighter margin at sup/inf
x1 and x2 = 1
y1 and y2= 0.5

Question 7

AFTER SET MLC… what now?

Answer 7

calculate plan