ESTRO 2024 - Abstract Book

S6008

RTT - Treatment planning, OAR and target definitions

ESTRO 2024

V30.6 (%)

0.1

0.1

0

0.4

0

0.1

0

0.2

Lad

Dmax Dmax

26.2 28.7 17.5 53.2 18.1 53.5

1.5 0.6 4.4 6.9 2.6 6.5 0.8

23

27.6

23.2 26.6 16.6 53.5

3.9 3.3 3.4 7.9 2.8 6.8 0.9

16.2 20.3 11.9 37.2

18.1 29.5

PRV (Lad)

27.4

30

Lung L

V18.07 (%)

12

26.7 62.8 21.8 67.4 11.1

22

V 4.82(%)

43.8 12.2 43.3

64.7 21.6

LungR

V18.07 (%)

17

13

V 4.82(%)

53.1

36.7

62

Lungs

Dmean

9.4

8.1

9.1

7

9.9

Table 3.

1 Iso

Min

Max

Total mean time

16

9

74

CBCT

2

1

7

2 Iso

Min

Max

Total mean time

23

11

124

CBCT

3

2

10

Table 4.

Skin toxicity CTCAEv5

1 Iso

2 Iso

G0 G1 G2

0 8 4

2 9 1

Conclusion:

Dosimetry planning can be an anatomic challenge for sBBC with photon therapy. Single-isocenter plan showed slightly improved OAR dose sparing, with less imaging CBCT and reduced daily treatment time. Acute toxicities were minor in both techniques.

Keywords: Bilateral Breast Cancer, VMAT, Planning

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