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FIG 5. Lower concentrations of albumin did not significantly alter T1 relaxation time.
A, T1 relaxation time measurement of a phantom with various degrees of albumin concentration shows marked reduction of T1 relaxation time in a set of tubes with oxygen exposure. No notable changes of T1 relaxation time are seen in a set of tubes without oxygen until the albumin concentration reaches 1250 mg/dL.
B, Same data were presented as TR (R1 = 1/T1) with various degree of albumin concentration. These two graphs show nearly linear relaxivity with or without oxygen. The curves of T1 relaxation time with and without oxygen are almost parallel, suggestive of no significant synergistic effect of albumin on T1 shortening of oxygen.
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