2017_SBRT_Course Book

Discussion: Clinical Relevance

▪ Should we measure intra-fraction motion?

▪ Yes, at planning in order to individualize the safety margin ?? ▪ And if necessary to reduce the motion amplitude with compression ▪ Should we correct for intra-fraction motion? ▪ The penumbra is more sharp in abdomen than in lung ▪ Amplitude has an effect on the margin ▪ Still systematic uncertainties dominate the required margin ▪ Should we correct for inter-fraction motion? ▪ YES! ▪ Should we adapt the treatment plan? ▪ First solve issues mentioned above