ESTRO 2024 - Abstract Book

S3313

Physics - Detectors, dose measurement and phantoms

ESTRO 2024

Conclusion:

The results showed large inter-patient variations depending on the total number of scans to which they were subjected. In-field and near-field organs may receive relatively high doses from imaging, but these are however significantly low in comparison to the prescribed dose (20-29.7 Gy RBE). Repeated scans are however needed because they allow the safe delivery of therapeutic doses to the target while keeping the treatment margins rather narrow and thus saving more normal tissues from therapeutic doses. From this perspective, imaging doses represent a lesser concern for the long-term survivors of cHL receiving PT. However, organ doses and their associated risks could be further minimized by using low dose CT protocols whenever feasible.

Keywords: proton therapy, CT imaging, individual organ doses

References:

1. VirtualDose: a software for reporting organ doses from CT for adult and pediatric patients. Aiping Ding, Yiming Gao, Haikuan Liu, Peter F Caracappa, Daniel J Long, Wesley E Bolch, Bob Liu and X George Xu. 2015, Physics in Medicine & Biology, p. 26.