Fig. 1From: A novel CBCT-based method for derivation of CTV-PTV margins for prostate and pelvic lymph nodes treated with stereotactic ablative radiotherapy a Composite volume generation for soft tissue-registered LN CTV contours. b 3D rendering of the original pCT LN CTV and the soft tissue composite LN structure. c Overlap analysis for a uniform 3 mm marginBack to article page