ESTRO 2024 - Abstract Book

S3706

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

ESTRO 2024

plan A and it was 86.7% to 100% (mean = 95.5%, Std Dev = 4.71%) for plan B. In S-I direction, which lung tumor moves the mostly, the coverage remains the same or even improved if iso moves superiorly for both plans, scenario 4. The tumor coverage decreased to 89.4% from 99.5% if iso moves inferiorly for plan A and it decreased to 99.7% from 100% for plan B, scenario 3. Fig. 2. is a sagittal view of the representative iso dose distribution of the original plan A and B and plans of scenario 3 for plan A and plan B.

Isocenter shift (cm)

V95 to tumor (%)

Scenario R-L

I-S

P-A

Plan A

Plan B

0

0.0

0.0

0.0

99.5

100.0

1

-0.5

0.0

0.0

96.9

97.0

2

0.5

0.0

0.0

85.2

86.7

3

0.0

-0.5

0.0

89.4

99.7

4

0.0

0.5

0.0

100.0

100.0

5

0.0

0.0

-0.5

93.2

92.5

6

0.0

0.0

0.5

90.7

92.6

Fig. 2. The iso dose plans of 2 selected senecios of plan A and B. top left: plan A, zero shift. top right: plan A 5 mm shift inferior. bottom left: plan B, zero shift; bottom right plan B 5 mm shift inferior.