Effects of iodinated contrast on various magnetic resonance imaging sequences and field strength: Implications for characterization of hemorrhagic transformation in acute stroke therapy

Figure 1 In vitro phantom magnetic resonance images at 3T. T1-WI (A), T2-WI (B), gradient-echo (GRE) (C) and fluid-attenuation-inversion-recovery (FLAIR) (D) magnetic resonance images of various aliquots of Iopamidol. Distribution in the phantom as follow: Bottom right, undiluted 100% contrast media; Bottom middle, 50%; Bottom left, 25%; Mid-row right, 12.5%; Mid-row left, 6.25% and Top, physiologic saline. Note significant hypo intensity of the higher concentrations of iodinated contrast on T2-WI (B), yielding the highest contrast to noise ratios. Conspicuity on FLAIR, GRE and particularly on T1-WI (hyper intensity respect to saline) is reduced as compared with T2-WI.