Table 1.

Effect of the time of addition of dextran (θ) on the R2 relaxivity of the DION rods.

Time of addition of Dextran (θ)	R2 (mM−1s−1)
Before adding ammonia	< 1
1 sec	50 ± 2
10 sec	150 ± 7
30 sec	300 ± 5
60 sec	300 ± 9