Abstract: A method and device for accurately and reproducibly positioning a woman's breast to receive radiation while the woman is positioned in a prone, face-down position upon a radiation treatment table are disclosed. The treatment table is useable with radiation accelerator tables of existing linear accelerator machines. The treatment table includes a generally flat patient support surface having an opening that allows the patient's breast to fall dependently below the support surface through the opening yet remain above the radiation accelerator table such that the breast can be irradiated for therapy or treatment. The platform further includes a head positioning device connected to the support surface such that a woman's head can be placed in the positioning device while she lies in the prone position and such that one or both of her breasts can be accurately and reproducibly positioned for treatment through the opening.