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Table 1 Comparison of plan quality

From: Simultaneous integrated boost therapy of carcinoma of the hypopharynx/larynx with and without flattening filter - a treatment planning and dosimetry study

   

IMRT

VMAT

Parameter

Goal

FF

FFF

FF

FFF

SIB

V95%

> 95%

93.7 ± 1.2

93.7 ± 1.3

94.5 ± 1.6

94.2 ± 1.9

HI

 

0.15 ± 0.03

0.15 ± 0.03

0.14 ± 0.03

0.15 ± 0.04

CI

> 0.7

0.83 ± 0.04

0.83 ± 0.04

0.87 ± 0.1

0.83 ± 0.05

PTV - SIB

V95%

> 95%

98.8 ± 0.3

99.0 ± 0.3

99.0 ± 0.3

98.9 ± 0.6

HI

 

0.23 ± 0.02

0.22 ± 0.02

0.22 ± 0.03

0.24 ± 0.04

PTV

CI

> 0.7

0.79 ± 0.03

0.78 ± 0.03

0.76 ± 0.03

0.76 ± 0.03

Spinal Cord

D1ccm

< 45 Gy

31.7 ± 2.1

31.5 ± 1.7

32.2 ± 1.8

31.7 ± 1.4

Brain Stem

D1ccm

< 48 Gy

34.6 ± 4.7

34.6 ± 5.0

39.5 ± 4.9

42.1 ± 4.5

Parotid Left

D50%

< 30 Gy

29.0 ± 4.8

28.3 ± 5.2

29.2 ± 5.6

29.9 ± 6.2

Parotid Right

D50%

< 30 Gy

30.5 ± 4.8

29.5 ± 4.4

29.7 ± 4.2

29.6 ± 4.3

Oral Cavity

V60%

 

50.8 ± 15.6

51.8 ± 16.0

52.0 ± 15.2

54.0 ± 17.0

  1. Mean values and standard deviation of the dose volume parameters for FF and FFF mode averaged over all patients separated by the treatment technique. Dose values are given in Gy, volumes in % of the structure volume. HI stands for homogeneity index, CI for conformity index. Bold values indicate statistically significant superior values in the comparison of FF vs FFF