Figure 1From: PTV margin definition in hypofractionated IGRT of localized prostate cancer using cone beam CT and orthogonal image pairs with fiducial markersDepiction of the mean differences in vertical, lateral and longitudinal directions between the intersections (blue) and the unions (pink) of the three CTVp as contoured by three radiation oncologists. The prostate volume was divided into 6 subsections (anterior, posterior, left, right, cranial, caudal).Back to article page