2017_IGRT course book

Intra-cranial stereotactic radiotherapy

Doses and margins in cranial SRS

Traditional frame-based SRS: 0mm margins Minimum dose 13Gy ➢ EXCELLENT local control & low Tox. ➢ Delivered dose probably lower Image-guided SRS: Uncertainties similar to frame-based SRS ➢ Should we add margins? ➢ Should we prescribe lower doses if margins are used?