OAR dobbes 5th IMRT

Question 1

Brain

Answer 1

Dmax: <60gy

Question 2

brain stem

Answer 2

Dmax : whole organ 54gy
D(1-10cc): <59 gy

Question 3

peripheral nerve

Answer 3

dmax: <60gy

Question 4

spinal cord

Answer 4

Dmax to PRV <50gy (48gy if CCRT)

Question 5

Breast (contralateral breast) Dmean

Answer 5

<5gy(old nancy)

Question 6

Breast (contra lung) V20gy

Answer 6

<8%(old nancy)

Question 7

Heart Dmean

Answer 7

<25 Gy,
V30Gy<45%

Question 8

Brachial plexus Dmax

Answer 8

<60Gy

Question 9

Esophagus Dmax

Answer 9

<50gy
length wise:
<8cm optimal
<12cm mandatory

Question 10

Pituitary gland

Answer 10

IMRT (<45 gy) (old nancy)

Question 11

Cochlea

Answer 11

mean dose <45 gy

Question 12

lacrimal gland Dmax

Answer 12

<40gy

Question 13

lens Dmax

Answer 13

<10gy

Question 14

optic nerve and chiasma

Answer 14

Dmax <55gy

Question 15

parotid

Answer 15

mean dose <24gy(dobbes)
Mean dose: single <20Gy (quantec)
mean dose both <25 Gy (quantec)

Question 16

pharyngeal constrictor

Answer 16

mean dose <50gy

Question 17

retina Dmax

Answer 17

<50gy

Question 18

submandibular gland

Answer 18

mean dose <39gy

Question 19

heart mean dose

Answer 19

<25 gy optimal
mandatory <30gy

Question 20

heart V30gy

Answer 20

<45%

Question 21

lung (whole lung volume minus GTV: V20gy

Answer 21

<35% (<25% if risk factors present)

Question 22

mean lung dose

Answer 22

<18gy

Question 23

oesophagus length with within the treated volume

Answer 23

V50<40% (quantec)
Max 58 gy
Surface dose <32 gy
optimal length 8cm, mandatory 12 cm

Question 24

bladder V50gy

Answer 24

<50%

Question 25

femoral head V50gy

Answer 25

<5% optimal <50% mandatory D100<52 Gy(quantec)

Question 26

kidney

Answer 26

V20gy <25% Dmean <18 Gy (quantec)

Question 27

liver mean dose

Answer 27

<28gy/<30gy

Question 28

ovary Dmax

Answer 28

<1.5gy,,<15gy mandatory menses are suppressed at 1.5 Gy and 6-15 Gy casues permanent ovarian failure.

Question 29

penile bulb

Answer 29

V50gy<50%

Question 30

Small bowel

Answer 30

Small bowel – V15 <120cc Dmax (0.1cc) <58 Gy

Question 31

spleen mean dose

Answer 31

<10 Gy

Question 32

Testis Dmax

Answer 32

optimal <2 gy mandatory <6Gy 0.2 gy can cause transient brief oligospermia, 2-3 Gy can lower sperm count, doses more than 6 Gy can cause permanent sterility. doses more than 20 Gy can affect hormone production