//ImageTypes
(FixedInternalImagePixelType "float")
(FixedImageDimension 3)
(MovingInternalImagePixelType "float")
(MovingImageDimension 3)

//Components
(Registration "MultiResolutionRegistration")
(FixedImagePyramid "FixedSmoothingImagePyramid")
(MovingImagePyramid "MovingSmoothingImagePyramid")
(Interpolator "BSplineInterpolator")
(Metric "AdvancedMattesMutualInformation")
(Optimizer "StandardGradientDescent")
(ResampleInterpolator "FinalBSplineInterpolator")
(Resampler "DefaultResampler")
(Transform "EulerTransform")

// ********** Pyramid

// Total number of resolutions
(NumberOfResolutions 4)


// ********** Transform

//(Scaler 500000.0)
//(CenterOfRotation 128 128 ??) center by default
(AutomaticTransformInitialization "true")
(HowToCombineTransforms "Compose")


// ********** Optimizer

// Maximum number of iterations in each resolution level:
(MaximumNumberOfIterations 600 600 600 900)

//SP: Param_a in each resolution level. a_k = a/(A+k+1)^alpha
(SP_a 1000.0 1000.0 500.0 500.0)

//SP: Param_alpha in each resolution level. a_k = a/(A+k+1)^alpha
(SP_alpha 0.602)

//SP: Param_A in each resolution level. a_k = a/(A+k+1)^alpha
(SP_A 50.0)


// ********** Metric

//Number of grey level bins in each resolution level:
(NumberOfHistogramBins 32)
(FixedLimitRangeRatio 0.0)
(MovingLimitRangeRatio 0.0)
(FixedKernelBSplineOrder 1)
(MovingKernelBSplineOrder 3)


// ********** Several

(WriteTransformParametersEachIteration "false")
(WriteTransformParametersEachResolution "false")
(WriteResultImage "false")
(ShowExactMetricValue "false")
(ErodeMask "true")
(UseDifferentiableOverlap "false")


// ********** ImageSampler

//Number of spatial samples used to compute the mutual information in each resolution level:
(ImageSampler "RandomCoordinate")
(NumberOfSpatialSamples 3000)
(NewSamplesEveryIteration "true")


// ********** Interpolator and Resampler

//Order of B-Spline interpolation used in each resolution level:
(BSplineInterpolationOrder 1)

//Order of B-Spline interpolation used for applying the final deformation:
(FinalBSplineInterpolationOrder 3)

//Default pixel value for pixels that come from outside the picture:
(DefaultPixelValue 0)