Combine two DICOM images

[M_pavi]

I want to combine two DICOM image together for an example head and neck likewise

[lassoan (Andras Lasso)]

See this post for instructions:

Merge dicom or nrrd or nii images

I want to merge sub-MRI images of a patient to one bigger file. I noticed that neither MITK nor ITK-Snap are suitable to merge images. C3d also fails because the sub-images have different sizes. Is it possible to merge MRI images anyhow? Operating system: Windows Slicer version:4.8