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The risk of lymph node planned target volume (PTV) being reduced on any given fraction of radiation. V95%, 95% dose (52.25 Gy) maintained to at least 95% of the nodal PTV; V99%, 99% dose (55.45 Gy) maintained to at least 90% of the nodal PTV; V100%, 100% dose maintained to at least 50% of the nodal PTV.
