The Vi-Cell system by Beckman Coulter is an imaging system designed for the analysis of yeast and mammalian cells suspended in culture media. The system automates the traditional and well accepted trypan blue dye exclusion method for cell counting and determination of cell viability by reporting the percentage of viable cells in the culture. Many industries measure cell viability or the health of cells and culture systems grown in bioreactors. This information is then used to make modifications to the cell culture environment and optimize the culture to ensure cell growth.