3D AdiabT1ρ UTE-Cones of a 2% agarose phantom with 0.1 mM MnCl2. (a) The region of interest for analysis is shown as the red circle on a selected AdiabT1ρ image (Nsp = 25, NAFP = 4). (b) Original and modified signal model fitting. The red diamond, triangle, circle markers represent the phantom data with 1, 25 and 45 spokes per AdiabT1ρ preparation, respectively. (c) Calculated T1ρ values by the original and modified models as Nsp increases from 1 to 50. The red dashed line is the reference T1ρ obtained with Nsp = 1, and the blue squares and green circles in represent the T1ρ values obtained from the fitting by original and modified model, respectively.