Gradient Echo Contrast

Class: NodeGradientEchoContrast

Node Icon

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