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Preprocessing Flow Data

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ThomasMr99 edited this page Feb 4, 2025 · 4 revisions

Description:
The following workflow loads a NIfTI file, processes certain properties, and outputs the data in various selectable formats.

Processors:
VolumeListSource, FlowMapCreator, VolumeListSpacing, VolumeListOffset, VolumeListRealWorldMapping, VolumeListSave

Arrangement:

preprocessing_flow_data

Operations:

  • VolumeListSource: Loads volume data, for instance, in the NIfTI format.
  • FlowMapCreator: Creates a vector field based on the data. The processor’s properties allow manipulation of the vector field’s orientation and channels.
  • VolumeListSpacing & VolumeListOffset: Provides options to adjust the volume data spacing (in mm) and the offset.
  • VolumeListRealWorldMapping: Enables various mappings, such as scale and offset adjustments.
  • VolumeListSave: Saves the processed volume data in one of the available data formats.

Further processors for preprocessing flow data

  • VolumeListAggregate: Provides the option to aggregate/melt the different timesteps of volume data into one volume by different functions. One example ist the maximum aggregation, where for each voxel the maximum value of all timesteps for the same voxel is taken.

Note: VolumeListAggregate will caluclate the aggregation voxelwise for all voxels of a volume. Meaning that if the examined geometry has deformations over time and voxels will have a strong change in their position, this aggregation does not work anymore. Therefore, the assumption to use this processor suitable is that the underlined geometry does only change in a small manner.

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