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When considering re-irradiation of a critical organ, should EQD2 or BED be utilized?
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Mednet Member
Radiation Oncology · University of Rochester
EQD2 and BED are essentially interchangeable. I prefer EQD2 since it conceptually makes more sense to me.
BED = D x [1 + d/(α/β)]
EQD2 = D × [(d + α/β)/(2 + α/β)]
= D x [1 + d/(α/β)]/(1 + 2/α/β)
= BED/(1 + 2/α/β)
The more challenging questions (that I do not have the answer to!) are as follows:
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