Combine Split Volumes
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Combines a number of split sub-volumes along the Z direction.

Input
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A 3D volume set with multiple sub volumes.
Optionally, a second image set with sparse slices.

Output
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A new 3D volume that combines the individual sub volumes into one and has the gaps in-between filled.

Description
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This algorithm takes a set of two or more volumes that can be combined along the Z dimension without interpolation.
The typical use case is that of missing slices in a DICOM folder, where a single volume is needed nevertheless for image processing.
The missing areas will be zero-filled or linearly interpolated based on the **maxGapToFill** parameter.
Optionally, another image set with loose slices may be provided, that are also filled in.
Last but not least, if only individual slices are available and not a single volume, the algorithm also will work if those slices are provided as the first parameter (volume).