engleski

Dosimetry of stray radiation in photon radiotherapy and phantom studies - results of EURADOS Working group 9

Radiation doses to normal tissues caused by stray radiation in radiotherapy are substantially lower than target doses, but they are inevitable and as such may be associated with side-effects of radiotherapy such as an increased risk of secondary cancers. When primary treatment goals such as target volume coverage and sparing of critical organs have been achieved, the reduction of unwanted side- effects becomes a legitimate objective and phantom dosimetry studies, using reliable dosimetry, are important for their investigation. Using organ doses and appropriate risk model, cancer risk for associated cancers can be estimated and protection of patients can be improved Dose measurements using anthropomorphic phantoms are very useful for estimating organ doses and for comparing different techniques and regimens. In addition, measured dosimetric data are needed to verify Monte Carlo and analytical models that are under development.s Within EURADOS WG9 (Radiation Dosimetry in Radiotherapy) several measuring campaigns, starting from laboratory with water tank to more realistic clinical conditions with anthropomorphic phantoms, were designed and carried out with the aim to gain information on the performance of dosimetry systems used in photon radiotherapy, to compare measured doses with values given by the treatment planning system (TPS) and to evaluate and compare the out-of-field doses for the treatment of the same clinical case using different radiation therapy techniques. In this overview the main results regarding dosimetry of stray radiation in photon radiotherapy and phantom studies carried out within EURADOS WG9 will be shown.

stray radiation ; photon radiotherapy ; out-of-field dosimetry

nije evidentirano