4D registration enquiry

[Farah Alkhatib]

Hi,

I have 4D CT dataset that is basically lots of DCM files (DICOM), each group of DCMs present a 3D volume phase in the cardiac cycle, so I ended up with 10 3D volumes, I don't know if this is assumed as 3D + t or 4D or something else. 

Now I am trying to register these dataset, my problem that I don't know what is the proper definition of this dataset because the 4D registration parameters have an image dimension of 4 while I have multiple 3D volumes (image dimension is 3).

Would you guide me in this, please?

Many thanks,

Farah