ESTRO 2024 - Abstract Book

S3670

Physics - Dose prediction, optimisation and applications of photon and electron planning

ESTRO 2024

Results:

Table 1 displays the difference for some of the in total 33 parameters examined (ΔParameter=Parameter(VMAT)- Parameter(DCA)). It also indicates the significance of the difference. Most of the depicted differences (e.g. conformity index (CI), gradient index (GI) and the bridging dose (BD)) were statistically significant, while the difference for the low dose region represented by the volume receiving 5 Gy (V5) was not statistically significant.

Metric

medianVMAT medianDCA

Δmedianabs Δmedianrel

p value

Significant

CI

1.10

1.23

-0.13

-10.38

5.20e-54

True

GI

4.26

3.81

0.45

11.87

1.18e-32

True

Coverage

0.99

0.99

0.00

0.02

7.89e-18

True

BD [rel]

0.40

0.40

0.00

0.68

2.03e-12

True

Dmean [Gy]

27.50

27.94

-0.43

-1.55

1.07e-09

True

Dmax [Gy]

31.29

30.45

0.85

2.78

1.71e-09

True

V5 [ccm]

10.42

10.18

0.25

2.44

0.12

False

V10 [ccm]

3.25

3.40

-0.16

-4.55

2.60e-08

True

V12 [ccm]

2.16

2.40

-024

-10.09

7.96e-08

True

V100% [ccm]

0.06

0.16

-0.10

-61.00

3.59e-53

True

Table 1: Some of the evaluated Parameters

All 33 examined parameters were correlated with each other. The resulting correlation matrix is depicted in Figure 1.