OARS

Question 1

The OARS of head and neck and Dmax

Answer 1

Brain stem/ optic chiasm = Dmax <54Gy

Optic nerve Spinal cord = Dmax <45Gy

Temporal lobe/Brain = Dmax< 60Gy, V40Gy<5cc

Brachial plexus= Dmax< 66Gy

Retina/ eye = Dmax< 50Gy
Lens = Dmax < 8Gy

Lacrima = Dmax < 30Gy

Manidble = Dmax < 70Gy

Carotid = Dmax <100Gy

Parodid is a mean dose = Dmean 26Gy

Question 2

OARs (an tolerances) for whole breast

What about if SCF/nodes

Answer 2

2Gy #s:
Ipsi lung V20Gy<15%
MHD < 4Gy (aim less than 2Gy), V20Gy<5%
Contra boob V4Gy<5%

SC <45Gy

Question 3

OARS of the upper abdo:

Answer 3

Spinal cord: Dmax< 45Gy
Lung: Dmean< 20Gy, V20Gy< 30%
Heart: V40Gy< 30%
Kidney: Dmean < 18Gy (if one kidney Dmean> 18Gy, aim contralateral kidney V6Gy<30%)
Bowel loop: V45Gy< 20cc
Stomach: V45Gy<15%

Question 4

OARs Pelvis:

Answer 4

Rectum:

Question 5

Oars for treating something in the middle of the chest (e.g. esophagus):

Answer 5

Spinal cord Dmax 45Gy,
Lungs V20Gy<20%,
Heart Kidney V40Gy<20%, consider split renal function if mean dose to one kidney >15Gy,
Liver V30Gy<30%,
Large bowel V15Gy<120cc.

Question 6

OARS and tolerances for chest XRT

Answer 6

LUNG: Mean lung dose <20Gy, V20gy<30%
Heart: MHD<20Gy, or boob chest wall MHD<4Gy (aim <2Gy).
Spinal cord DMax < 50Gy
Esophagus Mean dose < 25Gy, V60Gy<15%
Brachial plexus DMax<66Gy

Question 7

Pelvis OARS

Answer 7

Rectum V40Gy<35%
Bladder V40Gy<35%
Bowel loop: V45Gy< 20cc
Femoral heads V50Gy<5%