The Ernst angle is the optimal flip angle for a spoiled gradient recalled echo (GRE) which
maximizes the MR signal for a given T_{1} and TR. The equation for the Ernst angle is α_{ernst} =
cos^{-1} (e^{−TR/T1}). This online tool will help you calculate the Ernst angle to help
optimize T_{1}-weighted imaging pulse sequence parameters.

**Hint:** You may want to use the Parameter
Database to find the T_{1} value you are looking for.

**Hint:** If you are looking at optimizing the contrast between two different tissues in MRI
you may want to use the Contrastinator tool.

**Hint:** You can input up to 5 T_{1}'s for calculation and plotting. They may be
separated by any combination of the following delimiters: comma, space, semicolon, newline.