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Fig. 5. —MR images (TR/TE, infinite/1034; section thickness, 50 mm) of plain agar phantom (top left) and agar phantom with gadolinium chelate dissolved at concentrations of 0.1 (top right), 0.3 (bottom left), and 0.5 (bottom right) mmol/L. Signal intensity of agar (asterisk) decreases as concentration of gadolinium chelate increases. Signal intensity of hematocrit tube filled with normal saline solution (arrow) also decreases as concentration of gadolinium chelate increases, but conspicuity of hematocrit tube is good at concentrations of 0.1 and 0.3 mmol/L.