SCATTERED RADIATION AND ASSOCIATED SECOND CANCER RISK FROM PELVIC RADIOTHERAPY

Purpose: The purpose of this study was to evaluate the risk of gonad cancer inductionattributable to pelvic radiation therapy in adult patients. By diagnosing simple methods out-offielddose might be minimized.Methods: By characterizing the peripheral dose the TLDs were placed to the testis and ovaryin two fractions of radiotherapy. All patients delivered a 45 Gy total dose in 4 field in proneposition with 3D-planning. The doses from linear accelerator at 18 MV photon beam, wereinvestigated.Results: The mean excess relative risk (ERR) based on the BEIR IIV models of men andwomen after 5 and 10 years radiotherapy treatment for pelvic radiotherapy 0.825, 0.701, 0.960and, 0.804 respectively.Conclusion: Estimating the second cancer risk of untargeted organs is vital importance forsurvival patients in RT (radiotherapy). By using the single-energy mode linear acceleratorand proper shields can be minimized the out-of-field doses.

کلیدواژه های SCATTERED RADIATION AND ASSOCIATED SECOND CANCER RISK FROM PELVIC RADIOTHERAPY:

Radiotherapy ، cancer risk ، TLD ، Organ dose ، Out-of-field