Breast radiotherapy plan. An axial cut of patient A's computed tomography (CT) radiotherapy planning scan, through the thorax, of the right breast at the level of the tumor bed (red), surrounded by planning target volume (brown), breast clinical target volume (pink). Turquoise  =  50% isodose line (2120cGy), red  =  95% isodose line (4028cGy), Green  =  100% isodose line (4240cGy).