ESTRO 2024 - Abstract Book

S4084

Physics - Inter-fraction motion management and offline adaptive radiotherapy

ESTRO 2024

APBI

-0.07 ± 0.42

-0.08 ± 0.44

-0.35 ± 0.53

0.78 ± 4.27

-0.04 ± 3.32

-1.03 ± 4.67

APBI*

0.06 ± 0.26

-0.11 ± 0.47

-0.25 ± 0.49

0.03 ± 1.59

-0.46 ± 2.74

-0.49 ± 2.47

Prostate

-0.02 ± 0.09

0.04 ± 0.14

-0.05 ± 0.18

5.43 ± 7.56

2.12 ± 3.53

1.01 ± 3.88

Prostate*

0.00± 0.07

-0.02 ± 0.08

0.00 ± 0.08

0.94 ± 2.91

1.41 ± 2.60

-0.62 ± 2.66

* Data excluding fractions with large rotational correction in seed match registration

Conclusion:

Seed match has been long implemented for 2D/2D registration (1). In 3D registration, seeds- and GV registrations were comparable in majority of the cases. However, seed match was more prone to larger rotational correction, especially in the present of image artifacts or calcification within the target. This study shows that, when using Elekta CBCT and XVI software, GV match is more accuracy and reliable in ABPI and prostate patients with implanted markers.

Keywords: IGRT, prostate, mamma

References:

1. Clinical commissioning of online seed matching protocol for prostate radiotherapy. Duffton A, McNee S, Muirhead R, et al. Br J Radio. 2012;85(1020):e1273-e1281.