ESTRO 2024 - Abstract Book

S3631

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

ESTRO 2024

Conclusion:

4D dose calculations that model panning/tilting are essential for accurate dosimetry and safety of DTT treatments. 4D treatment planning strategies should be implemented when creating a DTT plan to improve sparing of OARs. The “Boolean OAR” method is simple to implement, however target coverage may be compromised, and OAR sparing is not guaranteed. The “Aperture Sorting” method takes longer to implement and a unique treatment delivery, but it results in improved OAR sparing while preserving target coverage. These 4D dose calculations and planning strategies were developed for the Vero4DRT linac, but could be adapted for any tracking system.

Keywords: 4D dose calculations, motion management, tracking

References:

1. Keall, P. J., et al . The management of respiratory motion in radiation oncology report of AAPM Task Group 76. Medical Physics. 2006.

2. Rosu, M., & Hugo, G. D. Advances in 4D radiation therapy for managing respiration: Part II - 4D treatment planning. Zeitschrift Fur Medizinische Physik . 2012;22(4), 272–280.

3. Carpentier, E. E. et al. Four-dimensional dose calculations for dynamic tumour tracking with a gimbal-mounted linear accelerator. Journal of Applied Clinical Medical Physics . 2021;22(6).

4. Takayama, K et al . Initial Validations for Pursuing Irradiation Using a Gimbals Tracking System. Radiotherapy and Oncology. 2009;93(1):45–49.

5. Kamino, Y et al . Development of an Ultrasmall C-Band Linear Accelerator Guide for a Four-Dimensional Image Guided Radiotherapy System with a Gimbaled X-Ray Head. Medical Physics . 2007;34(5):1797–1808