ESTRO 2024 - Abstract Book

S3722

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

ESTRO 2024

The comparison map generated using Accumulation: ACTIVE Dosimetry was visually assessed to identify hot or cold areas of significance.

Results:

The V99% and V100% for CTVp_6500 can be found in the table below:

Patient

V99% planned

V99% delivered

V100% planned

V100% delivered

1

89.0

96.1

64.8

79.0

2

87.5

73.8

61.3

34.5

3

92.8

98.5

62.4

70.3

4

75.7

67.5

56.7

43.4

5

79.9

89.4

43.6

45.5

6

86.2

73.5

52.9

29.0

7

92.0

82.2

66.1

42.9

Additionally, all D95% doses delivered during treatment met the 61.3Gy minimum target, and the CTVp_6500 volumes receiving 95% of the prescription dose was 100% for 5/7 patients, with 99.6% and 99.9% for the other two patients.

Figure 2 below shows graphically the V100% for CTVp_6500 categorised by mouthbite use (y) or lack thereof (n).

Paired T tests were calculated for the D95%, V99% and V100% to compare planned dose verses delivered dose for all patients, additionally comparing patients treated with a mouthbite verses without. No tests were found to be statistically significant to p<0.05.