Local T₁-T₂ distribution measurements in porous media

A novel slice-selective T₁-T₂ measurement is proposed to measure spatially resolved T₁-T₂ distributions. An adiabatic inversion pulse is employed for slice-selection. The slice-selective pulse is able to select a quasi-rectangular slice, on the order of 1 mm, at an arbitrary position within the sample.The method does not employ conventional selective excitation in which selective excitation is often accomplished by rotation of the longitudinal magnetization in the slice of interest into the transverse plane, but rather a subtraction based on CPMG data acquired with and without adiabatic inversion slice selection. T₁ weighting is introduced during recovery from the inversion associated with slice selection. The local T₁-T₂ distributions measured are of similar quality to bulk T₁-T₂ measurements. The new method can be employed to characterize oil-water mixtures and other fluids in porous media. The method is beneficial when a coarse spatial distribution of the components is of interest.