Figure 12. Effect of iohexol, iopromide, and 4N-TIB nanosuspension on the cell viability of HEK-293T cells. Cell viability was determined using an MTT assay and expressed as a percentage of the negative control cells. The cell viability (%) is expressed as the mean ± standard error of the mean of two independent measurements (asterisks indicate * P < 0.05, ** P < 0.01, *** P < 0.001, and **** P < 0.0001).
