[ITK] [ITK-users] What is an accepted duration of a 3D registration? Should I expect the MSE to "converge" to 0?

[Matias Montroull]

Hi Marina,
Did you compile in release mode or debug?
Regards,

Matias
On Sep 14, 2015 7:56 PM, "Marina Bendersky" <marina.bendersky at gmail.com>
wrote:

> Hello,
>
> I'm doing a 3D registration of 2 CT volumes (the fixed one contains
> 131 dicom images and the moving has 145 dicom images).
>
> I first converted each dicom series into one mha volume, using the
> example DicomSeriesReadImageWrite2.cxx and then, I do the registration
> following the example imageRegistration20.cxx. Below are the main
> registration components and parameters (other parameters had their
> default values):
>
> typedef itk::AffineTransform< double, Dimension  >  TransformType;
> typedef itk::RegularStepGradientDescentOptimizer     OptimizerType;
> typedef itk::MeanSquaresImageToImageMetric< FixedImageType,
> MovingImageType >  MetricType;
> typedef itk::LinearInterpolateImageFunction< MovingImageType, double >
>  InterpolatorType;
>
> double translationScale = 1.0 / 1000.0;
> optimizer->SetMaximumStepLength( 0.05 );
> optimizer->SetMinimumStepLength( 0.01 );
>
>
> This 3D registration runs on a MacBookPro laptop for 5.5 hours, so I
> was wondering, is this "normal"? How long should a 3D registration
> take?
>
> Also, the MSE metric keeps decreasing (though incrementally) even
> after 300 iterations (plot attached), and there are oscillations
> around the iteration 150 (I ran this twice and both times I get this
> plot!) - why could this be?
>
> Should I expect the MSE metric to converge to 0, or something closer
> to 0 (instead of the current values, in the ninety thousands...)?
>
> Thank you for your help,
> Marina
>
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