Equivalent Dose in 2 Gray Fractions

**Semantic type:** Quantitative Concept

**Definition:** The dose obtained using a 2 gray fraction dose, which is biologically equivalent to the total dose (D) given with a fraction dose (d) of gray. The values of equivalent dose in 2 gray fractions (EQD2) may be added in separate parts in the treatment plan.

**Synonyms:** - EQD2Gy