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Fig. 6C. —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. T2-weighted spin-echo sequences, TR/TE, 4,000/45 (1.5 and 3 T).