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Cumulative dose volume histogram of conventional whole brain radiation therapy (WBRT) with sequential RapidArc boost for patient no. 2 (A), and RapidArc WBRT with simultaneous integrated boost to tumor for patient no. 9 (B). Whole brain dose is lowered in simultaneous boost group, maintaining the similar tumor dose. Note steeper dose gradient for brain above 30 Gy in (B) than in (A).
