Verifying 4D gated radiotherapy using time-integrated electronic portal imaging: a phantom and clinical study.

ABSTRACT:

Background

Respiration-gated radiotherapy (RGRT) can decrease treatment toxicity by allowing for smaller treatment volumes for mobile tumors. RGRT is commonly performed using external surrogates of tumor motion. We describe the use of time-integrated electronic portal imaging (TI-EPI) to verify the position of internal structures during RGRT delivery

Methods

TI-EPI portals were generated by continuously collecting exit dose data (aSi500 EPID, Portal vision, Varian Medical Systems) when a respiratory motion phantom was irradiated during expiration, inspiration and free breathing phases. RGRT was delivered using the Varian RPM system, and grey value profile plots over a fixed trajectory were used to study object positions. Time-related positional information was derived by sub

SUBMITTER: van Sornsen de Koste JR 

PROVIDER: S-EPMC2075522 | biostudies-literature | 2007 Aug

REPOSITORIES: biostudies-literature