CT ReconstructionΒΆ
CT Reconstruction module computes a CT volume from a set of X-ray projections acquired in a calibrated geometry. Any geometry misalignment may pose artifacts in the CT volume, reduce the contrast and quality of the reconstruction. Therefore, it is recommended to calibrate the geometry prior to the CT reconstruction.
Once the projection data is loaded into the Imfusion Suite workspace, the CT Reconstruction algorithm can be openned from the associated algorithm menu of the projections.
Now, select the problem formulation from the Problem
drop box in the CT Reconstruction controller.
Once the problem is set, the Solver
list will allow to select the corresponding solvers supported by the problem formulation.
Then, depending on the problem and solver selections, extra algorithm configurations are needed. For example, FDK solver works with different Additional weighting
schemes, while iterative solvers such as SQS requires maxIterations
to be specified.
Further adjustments can be made for the OptiomizationProblem.
Now, adjusting the Volume Descriptor:
Volume Descriptor allows to specify:
type
: Data type of the reconstruction, can be seleted from the list.width
: Width of the CT volume in voxel.height
: Height of the CT volume in voxel.slices
: Number of slices in the CT volume.spacing
: Space between centers of two neighboring voxels, in mm.center
: Coordinates of the volume center relative to the isocenter.
Upon adjusting the size of the CT volume, one can enable Show bounding boxes
in the controller for the visualization of the volume bounding box in the 3D view, or directly adjust the bounding box from the slice view and the changes are updated in the 3D view.
After all necessary configurations are done, we can now start the reconstruction process by clicking the Compute
button at the bottom of the controller.
The reconstruction will be updated and a progress bar will be displaying the current status of the computation.
Once it is done, the reconstructed slices and the CT volume can be viewed from the slice and 3D view of Imfusion Suite.