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A transformation of the form x to iy; x,y in R, or an equivalent similaritytransformation with a metric operator $\eta$ are shown to transformnon-Hermitian PT-symmetric Hamiltonians into Hermitian partner Hamiltonians inHilbert space. Isospectrality and mass signature are discussed.

Non-Hermitian PT-symmetric and Hermitian Hamiltonians' correspondence: Isospectrality and mass signature