Transform to Vector

Class: NodeDeformationAnalysis

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Takes a transformix parameter input and will output the movement in each pixel of the fixed image as a vector image. If an image reference is supplied, the movement will be evaluated at the voxel positions of the image reference. Note that this is much slower. This node is especially useful for analyzing deformations resulting from non-rigid image registrations. Input points are specified in the fixed image domain, since the transformation direction is from fixed to moving image.

Example workflows

Deformation analysis example

Inputs

Image Reference

Optional input image. If supplied, the deformation will be evaluated at the voxel positions of the image reference.

Type: Image4DFloat, Optional, Single

Transformix

The transformix parameter input to be evaluated.

Type: TransformixParameter, Required, Single

Mask

Optional mask. Only voxel positions marked as true will be evaluated. Only applies if an optional image reference is supplied.

Type: Image4DBool, Optional, Single

Outputs

Deformation

The deformation field at the specified voxel positions.

Type: Image4DVector3

Settings

Ignore Existing Initial Transform Boolean

Ignores the initial transform specified in the parameters file.

References

S. Klein, M. Staring, K. Murphy, M.A. Viergever, J.P.W. Pluim, 2010. “elastix: a toolbox for intensity based medical image registration”