[Insight-users] How to read and store multiple variable-length frame images?

[Geoff Topping]

I'm writing a custom ImageIO class to read a file format that has multiple 
3D volumes in one file, with each volume corresponding to a different time 
frame.  I am unsure how I should store this information to be compatible and 
consistent with the rest if ITK...

The frames are of different durations, so I can't use a single m_Spacing 
value for that dimension.  Also, I don't want the time dimension to be 
treated as if it was a spatial dimension when doing registrations on the 
volumes...  In particular, I'd like to be able to apply a spatial 
transformation to each 3D  frame volume as if it was a separate 3D image.

That said, it is essentially a 4D data set, so it would seem natural to 
treat it as a 4D image, if this is possible.  I'm also not sure how to 
properly read and store multiple 3D volumes from a single ::Read() call.

I haven't been able to find any indication online of how this sort of 
situation should be dealt in ITK.  Are there any existing multi-frame 
variable-duration image reading classes I can base my work off of?  Any help 
would be appreciated.

Geoff Topping

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