Poster — Wed Eve—55: Automated Image Guidance for Prostate IMRT Using Low Dose Cone Beam CT

Currently, we are using Varian's On Board Imager to acquire cone beam computed tomography (CBCT) images prior to prostate intensity modulated radiotherapy (IMRT). The images are used to determine the post‐setup prostate position, and thus, to shift the couch towards the situation assumed during treatment planning. This “manual forward” image guided radiotherapy (IGRT) technique is time consuming and requires significant imaging dose over the …