The MR signal and contrast calculator or app lets you choose two tissue T1 and T2 whilst manipulating the scanner parameters: TR and TE to show the signal, contrast and relative contrast to noise ratio (CNR). Use the calculator to explore the weightings below.
The gradient echo signal and contrast calculator or app allows you to examine the relationships between tissue T1 and T2 (T2*) and scanner parameters: TR, TE and flip angle. It also allows you to estimate the effect of field inhomogeneity on the signals. It calculates the Ernst angle for each tissue.