Field Borders

Question 1

Pelvis AP/PA Field:
Sup -
Inf -
Lat -

Answer 1

Sup - L4/5, S1
Inf - bottom of ischial bone
Lat - 2 cm outside of pelvic brim

Question 2

Pelvis Lateral Field:
Ant -
Post -

Answer 2

Ant - Pubic symphysis

Post - S2

Question 3

Prostate AP/PA Borders:
Sup -
Inf -
Lat -

Answer 3

Sup - S1
Inf - lower margin of ischial bone
Lat - 1.5 - 2 cm outside the pelvic brim

Question 4

Prostate Lat Borders:
Ant -
Post -
Lat -

Answer 4

Ant - 1/2 cm into pubic bone
Post - S2
Lat - 10 - 12 cm

Question 5

Lung Borders:
Sup -
Inf -
Lat -

Answer 5

Sup - include bilateral S/C nodes
Inf - 5 cm inf to carina
Lat - width of bilateral S/C with 2cm margin around tumor vol

Question 6

Whole Brain Borders:
Sup - 
Inf -
Ant - 
Post -

Answer 6

Sup - 1.5 cm flash off skin (top of head)
Inf - C2
Ant - 1.5 cm flash off skin of anterior frontal bone
Post - 1.5 cm flash off skin of posterior occipital bone

Question 7

Spine Borders:
Sup/Inf -
Lat -

Answer 7

Sup/Inf - 1 vertebral body above and below affected vertebral bodies
Lat - 2 cm around vertebral body

Question 8

Breast Tangents Borders:
Sup/Inf -
Ant -
Post -

Answer 8

Sup/Inf - BBs
Ant - 2 cm flash
Post - 1 cm lunf

Question 9

Breast:
Wedge on 1st field -
Wedge on 2nd field -

Answer 9

30 in

30 out

Question 10

Labs w/MLCS: (4)

Answer 10

Lung, Prostate, Pelvis, Brain

All but spine and breast

Question 11

Which field on the breast lab should have more weight?

Answer 11

Medial