Gradient Echo Contrast
Class: NodeGradientEchoContrast
This node generates simulated MRI images of gradient-echo type using proton density, T1 and T2* maps and signal equations.
Example Workflows
Generate a gradient-echo image
Inputs
PD
Proton density map.
Type: Image4DFloat, Required, Single
T1
T1 map in units of seconds.
Type: Image4DFloat, Required, Single
T2*
T2* map in units of seconds.
Type: Image4DFloat, Required, Single
Outputs
Signal
The calculated image.
Type: Image4DFloat
Settings
Contrast Selection
Select type of contrast.
For SpoiledGradientEcho the signal is cacluated using:
\[
\begin{equation}
S = PD\frac{1-e^{-TR/T_1}}{1-\cos(FA) e^{-TR/T_1}} \sin(FA) e^{-TE/T_2^*}
\end{equation}
\]
Values: SpoiledGradientEcho
Repetition time [ms] Number
The repetition time (TR).
Echo time [ms] Number
The echo time (TR).
Flip angle [deg] Number
Flip angle (FA)
Inversion time [ms] Number
Inversion/saturation time (TI)
See also
Brainweb MR BETA, Spin-echo contrast BETA
Keywords: MRI, gradient-echo
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