Table 1: Summary of group's characteristics.

Parameter

group- I

(Metastases)

group - II

(Metastases)

group- III

(Metastases)

group- IV

(Meningioma)

No of lesions

36

16

15

23

Average Target Volume (1s) (cm3)

0.30 0.12

3.40 2.82

3.80 3.18

3.90 3.03

Organ(s) at risk

None

None

Brainstem

Brainstem, optical nerves, chiasm