Table 2. TI_s, TI_i, ΔTI, ${\text{S}}_{{\text{TI}}_{\text{s}}}$ contrast at TI_i, S_dSIR contrast at TI_i, and ratio S_dSIR contrast/${\text{S}}_{{\text{TI}}_{\text{s}}}$ contrast.

TIs (ms)	TIi (ms)	ΔTI		${\text{S}}_{{\text{TI}}_{\text{s}}}$ contrast	SdSIR contrast	Ratio SdSIR contrast/${\text{S}}_{{\text{TI}}_{\text{s}}}$ contrast
		ms	%
580	1,100	520	90	0.40	2.0	5
580	840	260	45	0.25	2.0	8
580	710	130	22	0.15	2.0	13
580	655	75	13	0.10	2.0	20

ΔTI is the second TI (1,100–655 ms) minus the first TI (580 ms) for the dSIR T₁-bipolar filter, and is positive. As TI_i is reduced from 1,100 ms (first row) to 655 ms (fourth row), the mD narrows and the magnitude of ΔTI decreases from 90% (first row) to 13% (fourth row). As the mD narrows and the magnitude of ΔTI decreases, the ratio dSIR contrast/${\text{S}}_{{\text{TI}}_{\text{s}}}$ contrast increases from 5 (first row) to 20 (fourth row). TI_s, short TI; TI, inversion time; TI_i, intermediate TI; dSIR, divided subtracted inversion recovery; mD, middle domain.