[Insight-users] SPECTtoMRIRegsitration-Transformation

[Luis Ibanez]

Hi Suresh

Did you checked the values of the pixel spacing
in both images ? could you please post the
values of the spacing in both the MRI and the
SPECT as well as their number of pixels along
each dimension.

If the final transform is not applying major
scale changes, it may be due to the relative
pixel scaling of both images. It may also be
due to the optimizer being trapped in local
minimum far from the actual global minimum.

What happens when you resample the SPECT with
this transform ? Does the image appears at the
same size ? Does it appears at all ?


Thanks,


   Luis


================================================


suresh wrote:

> Hi Luis,
> 
> Thanks for the help.
> I have made all changes suggested by you.(code added at the end of
> this mail.
> 
> After registration the GetlastTransformParameters returned the
> following values ,
> when fixed=MRI, and moving = SPECT
> 
> 1.000000  0.000000  0.000000
> 0.000000  1.000000  0.000000
> 0.000000  0.000000  1.000000
> 0.000000  0.000000  0.000000
> 
> when fixed=SPECT, and moving = MRI, this is result
> 
> 1.000447  0.002335  0.000873
> -0.002983 0.990681  -0.001873
> -0.016508  -0.002983 0.996628
> 0.134443  -0.462841  -0.002983
> 
> I have already posted a message with the code details.
> 
> please... any body help me with this.
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