Image Registration

Input

Two 2D or 3D images, the transformation or deformation of the second one will be modified

Output

None

Description

Different means for automatic image-based registration are provided. With the default settings, a click on “Register” causes the second image (template) to be moved until it is best aligned with the first (reference). This works both for images of the same modality (mono-modal), as well as a pair of different modalities, such as CT-MRI, CT-US, MRI-US. Corresponding internal settings such as the similarity metric for optimization are applied automatically.

../../_images/Image Registration Controller.png
  1. The option “Moving” selects which image will be modified by the registration.
  2. The option “Transformation” selects how the template image is manipulated: - Linear: The rigid pose, i.e. translation and rotation is modified - FFD: Free-form deformation, a parameteric deformation model with a chosen number of control points arranged in a regular grid - TPS: Thin-plate-splines, a parametric deformation model with individually placed control points that define the deformation. This option may also be chosen in order to use a parametric deformation pre-defined on the moving image - Demons: A dense deformation field is computed on the template image based in gradient forces - Greedy Demons: A dense deformation field is computed based on local patch-based similarity for multi-modal registration (LNCC or LC2)
  3. The option “Preprocessing” selects what preprocessing is performed on the images before registration. The value ‘Automatic’ selects the best options depending on the input images (e.g. their size or modality). If set to ‘Manual’, all available preprocessing options will be displayed for selection. The preprocessing will never change the pixel data of the input images.
  4. The “Reset” button reset the images to their original, un-registered state, i.e. their state before the “Image Registration” was opened.
  5. The “Register” button starts the actual registration. A progress indicator is displayed until the registration is finished and the views will continuously update with an intermediate state of the registration. If the registration is cancelled, the last intermediate state is used as the result.

In the controller “Image Registration Settings” more advanced options can be chosen.