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

[Dženan Zukić]

One possible reason for such slow registration could be compiling you
application in debug mode. Release mode is many times faster with ITK,
sometimes even hundredfold!

On Mon, Sep 14, 2015 at 6:56 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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