ESTRO 2024 - Abstract Book

S4369

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

ESTRO 2024

Figure 2: Comparison of the different anisotropic PTVs on the target coverage. The y-axis shows the percentage of the post-treatment prostate, that was outside the respective PTV.

Conclusion:

We presented a novel method for prostate IFM analysis in MRgRT of prostate cancer using a voxel-based approach. Anisotropic margins, derived from population-based motion histograms accounted in most cases for IFM. In comparison to AP and SI directions, smaller motion was found for LR direction. The largest motion was determined for SI direction. These findings highlight the need for inclusion of anisotropic margins in treatment planning for MRgRT of prostate cancer, especially in the ultra-hypo-fractionated treatments.

Keywords: Voxel-based, Margins, MRgRT

2659

Digital Poster

Dosimetric impact of repeated DIBH in short-course breast IMRT and VMAT

Joan J. Penninkhof, András G. Zolnay, Sophie C. Huijskens, Agustinus J.A.J. van de Schoot, Mischa S. Hoogeman

Erasmus MC Cancer Institute, Radiation Oncology, Rotterdam, Netherlands