[Insight-users] Difference between 3.4 and 3.14 for MattesMutualInformation Registration ?

[Uma Ranjan]

Hi Luis,

 No, the images have (1,0,0/0,1,0/0,0,1) as direction cosines. Also, the
images are from an in-line system which has identical slice spacing, so they
are more or less registered already. I found that the 1.3 version of the
same optimizer gave much better results.

And no - I have not turned ON REVIEW or
ITK_USE_OPTIMIZED_REGISTRATION_METHODS. Will they help ? I only found that I
was not setting the direction in the resampler, but setting it only made
things worse for the rotation values.

regards
uma

On Sat, Mar 27, 2010 at 11:32 PM, Luis Ibanez <luis.ibanez at kitware.com>wrote:

> Hi Uma,
>
> Do your images have Orientation ?
>
> That is, the value of their Direction matrix,
> is it different from Identity ?
>
> If so, the behavior of ITK 3.14 will be more
> appropriate than the behavior of ITK 3.4.
>
> Also:
>
> Have you turned ON the use of the REVIEW
> directory ?
>
> are you using the flag
>
> ITK_USE_OPTIMIZED_REGISTRATION_METHODS  ?
>
>
> ---
>
> To assist you better, we will need more details
> about the registration that you are performing.
>
>
>      Thanks
>
>
>             Luis
>
>
> -----------------------------------------------------------------------
> On Sat, Mar 27, 2010 at 1:26 PM, Uma Ranjan <usranjan at gmail.com> wrote:
>  > Dear all,
> >
> >
> >  I see a difference in the transform values (and visual performance)
> between
> > ITK 3.4 and 3.14 versions for the same images and identical parameters.
> >
> >
> >
> >  I use VersorRigid3DTransform  with LinearInterpolateImageFunction as
> > interpolator,  MattesMutualInformationImageToImageMetric as metric and
> > VersorRigid3DTransformOptimizer as optimizer.
> >
> > The performance seemed to be better in 3.4. Is there anything additional
> > that I need to specify between the two versions ?
> >
> > I have set the following parameters for the optimizer :
> >    SetScales(optimizerScales), setMaximumStepLength(.),
> > setMinimumStepLength(.),SetNumberOfIterations(.), setRelaxationFactor(.),
> > MinimizeOn() ;
> >
> > For the Metric, I set the following :
> >
> >  SetNumberOfHistogramBins(), SetNumberOfSpatialSamples(.),
> > ReiniitalizeSeed(.),
> >
> > Best regards
> >
> > Uma Ranjan
> >
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