Figure 13.

Subtracted IR (SIR) and Added IR (AIR) T₁-filters. T₁ is shown along the linear X axes in ms. (A) shows the TI_s T₁-filter (pink) and TI_i T₁-filter (blue), (B) shows the subtraction (S_TIs − S_TIi) IR or SIR T₁-filter, and (C) shows the addition (S_TIs + S_TIi) IR or AIR T₁-filter. The middle Domain (mD) is the T₁ values along the X axis between the vertical dashed lines. In (B), the slope of the SIR T₁-filter in the mD is approximately double that of the S_TIs T₁-filter (pink in (A)). In (C), the signal at T₁ = 0 is doubled to 2.0, and the signal in the mD is reduced to approximately 0.20 in the nearly linear, slightly downward sloping central part of the AIR T₁-filter (i.e., in the middle Domain, mD).