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Fig. 6B. —Measured signal-to-noise ratio (SNR) versus concentration of gadodiamide in normal saline, and saline with iohexol (iodinated contrast material), for four sample sequences. SNR curves for other T1- and T2-weighted sequences were similar in form to those shown here. T1-weighted spin-echo sequence, TR/TE, 500/15 (1.5 and 3 T) (A); proton density-weighted spin-echo sequence, 2,550/30 (1.5 and 3 T) (B); T2-weighted spin-echo sequence, 4,000/45 (1.5 and 3 T) (C); and gradient-echo sequences, 33.3/13 (3 T) and 34/13 (1.5 T) (D). In A and B, observe some shift to lower concentrations for saline solutions at 3 T relative to 1.5 T. Note increase in SNR at 3 T for all sequences except for T2-weighted sequence with iodinated contrast material. Also note decrease in SNR with iodinated contrast material except for T1-weighted sequence at low gadolinium concentrations.