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Table 2 Summary of dosimetric results for organs at risk (OAR) on the cohort of 13 patients

From: Fractionated stereotactic radiotherapy of benign skull-base tumors: a dosimetric comparison of volumetric modulated arc therapy with Rapidarc® versus non-coplanar dynamic arcs

Organs

 

Dynamic arc (DA)

Rapidarc (RA)

p-value

Brainstem

D2 % (Gy)

47.4 ± 13.6

47.1 ± 12.0

DA vs RA p = 0.81

Spinal cord

D2 % (Gy)

8.9 ± 5.2

1.8 ± 1.9

DA vs RA p = 10–4

Pituitary glanda

D2 % (Gy)

23.7 ± 19

28.6 ± 16.5

DA vs RA p = 0.01

 

D mean (Gy)

17.3 ± 16

22.2 ± 15.4

DA vs RA p = 0.02

Chiasm

D2 % (Gy)

32.7 ± 22.5

29.3 ± 23.4

DA vs RA p = 0.01

Hippocampus

D mean (Gy)

16.7 ± 9.2

11.9 ± 5.5

DA vs RA p = 0.006

 

D40 % (Gy)

16.2 ± 10.5

9.9 ± 5.7

DA vs RA p = 0.005

Ipsilateral cochlea

D2 % (Gy)

39.4 ± 18.0

33.8 ± 13.8

DA vs RA p = 0.008

 

D mean (Gy)

35.3 ± 18.0

25.4 ± 9.7

DA vs RA p = 0.008

Controlateral cochlea

D2 % (Gy)

12.5 ± 12.3

17.9 ± 8.4

DA vs RA p = 0.05

 

D mean (Gy)

10.8 ± 11.1

15.8 ± 7.9

DA vs RA p = 0.04

Cerebellum

D mean (Gy)

8.7 ± 7.0

10.7 ± 5.6

DA vs RA p = 0.11

Ipsilateral lens

D2 % (Gy)

1.1 ± 1.5

3.1 ± 2.2

DA vs RA p = 0.01

 

D mean (Gy)

0.9 ± 1.3

2.4 ± 1.9

DA vs RA p = 0.01

Controlateral lens

D2 % (Gy)

1.4 ± 1.9

3.2 ± 2.1

DA vs RA p = 0.01

 

D mean (Gy)

1.1 ± 1.5

2.5 ± 1.9

DA vs RA p = 0.01

Ipsilateral optic nerve

D2 % (Gy)

26.8 ± 23.1

26.3 ± 22.5

DA vs RA p = 0.83

Controlateral optic nerve

D2 % (Gy)

21.7 ± 19.9

24.0 ± 20.6

DA vs RA p = 0.62

Ipsilateral eyeball

D2 % (Gy)

4.1 ± 2.9

9.2 ± 4.5

DA vs RA p = 10–4

 

D mean (Gy)

0.6 ± 0.9

1.4 ± 1.3

DA vs RA p = 0.09

Controlateral eyeball

D2 % (Gy)

3.3 ± 3

10.2 ± 4.9

DA vs RA p = 10–4

 

D mean (Gy)

0.2 ± 0.3

1.5 ± 1.4

DA vs RA p = 0.002

Healthy brain (i-e brain-PTV)

D mean (Gy)

6.7 ± 2.7

5.1 ± 1.8

DA vs RA p = 0.002

 

V100 % (%)

0.4 ± 0.8

0.02 ± 0

DA vs RA p = 0.02

 

V95 % (%)

0.9 ± 1.2

0.3 ± 0.2

DA vs RA p = 0.03

 

V90 % (%)

1.4 ± 1.4

0.7 ± 0.4

DA vs RA p =0.05

 

V80 % (%)

2.2 ± 2.1

1.3 ± 0.7

DA vs RA p =0.06

  1. Data presented the mean doses of all patients ± standard deviation. Bold techniques means that this technique is superior for this organ in particular. Nb Vx% = minimum x% of prescribed dose received by the volume and Dx% is the minimum dose received by x% of the structure volume. aPituitary adenomas treatments excluded