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Target volume and dose-volume histogram. Figure 2A Magnetic resonance imaging after open surgery with isodose lines from 10 to 110%. Target volume is marked in red, chiasm in green and brainstem in blue. Figure 2B Dose-volume histogram (DVH) of the radiation shows the dose given to the percentage of OAR (organ at risk) volume, i.e. less than 20% of the chiasm was irradiated with 56 Gy within 6 weeks.
