[Insight-users] problems on deformable registration 8

[Luis Ibanez]

Hi Sean,

This is very suspicious.


A) your images do not seem to be that big...

    One image of:

      64 slices of 256 x 256 in 16bits

    will take 8 Mb


    How much RAM do you have ?


B) Just removing one slice (out of 60) from your
    dataset shouldn't lead the registration to
    behave differently.


    Unless...

    There is some special content in that slice...

    Are any objects in Slice 60 that have very
    different intensities to those objects visible
    in slice 59  ?


...and...


C) How are you removing that slice ?

    Are you using a region of interest extraction first ?




Please let us know,


     Thanks



         Luis



---------------
Sean lee wrote:
> Hello,
> 
> I am trying to use the example of deformable registration 8 on two ct 
> image volumes (64 256X256 slices). The problem is If i use more than 62 
> slices, I would have memory problem; I run 60 slice, I got a perfect 
> results with 20 iterations; but if I run 59 slices, it only run one 
> iteration and reaches "CONVERGENCE: REL_REDUCTION_OF_F <= FACTR*EPSMCH". 
> I tried to reduce the Cost Function Convergence Factor to 1e+1 and it 
> still comes same results. What could be the problem and any suggested 
> solutions? Thanks. Sean
> > 
> 
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