Skip to main content

Table 3 Averaged values of dose-volumetric parameters

From: Optimal collimator rotation based on the outline of multiple brain targets in VMAT

Structure

DV parametera

Std-VMAT

Colli-VMATPre (40°)

Colli-VMATPre (60°)

Colli-VMAT (40°)

Colli-VMAT (60°)

Target volume

D99%b (Gy)

28.8 ± 11.9

28.6 ± 11.6

28.7 ± 11.7

28.6 ± 11.6

28.7 ± 11.7

D95% (Gy)

29.4 ± 12.4

29.2 ± 12.2

29.3 ± 12.4

29.3 ± 12.2

29.4 ± 12.2

D5% (Gy)

32.3 ± 15.4

32.4 ± 15.1

32.3 ± 15.4

32.4 ± 15.1

32.2 ± 15.0

D1% (Gy)

32.6 ± 15.7

32.7 ± 15.2

32.6 ± 15.5

32.7 ± 15.2

32.4 ± 15.1

Minimum dose (Gy)

21.4 ± 10.0

22.0 ± 10.1

21.4 ± 10.0

22.1 ± 9.9

21.1 ± 10.1

Maximum dose (Gy)

33.2 ± 14.3.

33.1 ± 14.4

33.2 ± 15.3.

33.0 ± 15.4

33.1 ± 15.3

Mean dose (Gy)

31.1 ± 15.0

31.4 ± 14.4

31.4 ± 15.0

31.4 ± 15.3

31.3 ± 15.4

Conformity index

0.8 ± 0.1

0.8 ± 0.1

0.8 ± 0.1

0.8 ± 0.1

0.8 ± 0.1

Homogeneity index

0.09 ± 0.02

0.10 ± 0.06

0.09 ± 0.03

0.10 ± 0.04

0.10 ± 0.02

Gradient measure (cm)

1.3 ± 0.2

1.4 ± 0.1

1.3 ± 0.1

1.4 ± 0.1

1.3 ± 0.1

Normal brain - PTV

V5 Gyc (cc)

776.6 ± 316.3

778.0 ± 320.1

783.4 ± 320.4

764.6 ± 318.2

766.0 ± 313.3

V12 Gy (cc)

454.5 ± 333.4

443.3 ± 340.7

448.7 ± 342.9

439.5 ± 341.1

441.1 ± 335.8

V15 Gy (cc)

357.3 ± 333.4

351.5 ± 340.7

356.7 ± 342.9

347.5 ± 341.1

348.5 ± 335.8

Mean dose (Gy)

13.4 ± 9.9

13.3 ± 10.0

13.4 ± 10.0

13.2 ± 10.1

13.1 ± 9.7

Spinal cord

Maximum dose (Gy)

3.6 ± 2.0

3.2 ± 2.8

3.1 ± 2.2

1.8 ± 2.5

3.1 ± 2.9

Brain stem

Maximum dose (Gy)

26.6 ± 15.3

26.6 ± 16.6

26.6 ± 16.7

26.4 ± 16.5

26.3 ± 15.9

Optic chiasm

Maximum dose (Gy)

26.4 ± 11.5

25.7 ± 11.5

25.5 ± 11.6

25.0 ± 12.0

25.3 ± 11.3

Right optic nerve

Maximum dose (Gy)

19.6 ± 16.8

18.5 ± 16.3

18.4 ± 16.9

17.7 ± 16.8

18.0 ± 17.0

Left optic nerve

Maximum dose (Gy)

19.6 ± 17.5

17.8 ± 16.6

18.4 ± 17.0

17.6 ± 16.8

18.2 ± 17.5

Right lens

Maximum dose (Gy)

3.5 ± 2.2

3.4 ± 3.0

3.4 ± 2.8

3.0 ± 3.1

3.0 ± 2.0

Left lens

Maximum dose (Gy)

3.1 ± 1.9

3.0 ± 2.0

3.2 ± 2.3

2.8 ± 2.0

3.0 ± 1.7

Right parotid

Mean dose (Gy)

0.9 ± 1.2

0.8 ± 1.3

0.8 ± 1.2

0.7 ± 1.1

0.8 ± 1.2

Left parotid

Mean dose (Gy)

1.0 ± 1.2

1.1 ± 1.2

1.1 ± 1.0

1.1 ± 1.2

1.1 ± 1.0

  1. aDV parameter = dose-volumetric parameter
  2. bDn% = dose received at least n% volume of a structure
  3. cVn Gy = absolute volume irradiated by at least n Gy of a structure