ESTRO 2024 - Abstract Book

S4189

Physics - Intra-fraction motion management and real-time adaptive radiotherapy

ESTRO 2024

Field 2

Field 2

<2 mm

86%

91%

94%

<2 deg

99%

98%

99%

<5 mm

11%

8%

4%

<5 deg

1%

2%

1%

>5 mm

3%

1%

2%

>5 deg

-

-

-

Field 3

Field 3

<2 mm

80%

88%

89%

<2 deg

98%

99%

100%

<5 mm

15%

8%

8%

<5 deg

2%

1%

-

>5 mm

5%

4%

3%

>5 deg

-

-

-

Table 1: The frequency of SGRT repositioning (in percent) for the 6DOF and for the 3 fields

Figure 1: The distribution of the frequency of SGRT repositioning (in percent) among the three fields

Conclusion:

This study indicates that SGRT repositioning was triggered in 38% of the treatment sessions. Of these, 26% were true positives, leading to intra-fractional repositioning. However, the majority of the SGRT-triggered X-rays did not lead to repositioning, which must be investigated further.

Keywords: SGRT, IGRT, head and neck

831

Proffered Paper