Radiobiology 2016

SRS – whole cord vs hemi-cord irradiation

whole cord

hemi cord

Dos e (Gy)

response

Dos e (Gy)

response

16

0/2

16

0/5

18

1/5

18

1/3

20

4/4

20

4/5

22

4/4

22

3/3

24

4/4

ED

≈ 19 Gy

50

• Similar dose response for whole cord compared to hemi-cord irradiation. • Morbidity is less for hemi-cord as lesions are limited to lateral high dose region