[ITK] InvertDisplacementFieldImageFilter in SimpleITK

[Gustafsson Christian K]

Hi!
Thanks for your reply. I can not find out any more from the code. If it is physical space, what unit is used?
Default seems to be
m_MaxErrorToleranceThreshold(0.1),
m_MeanErrorToleranceThreshold(0.001),

so I guess this is not meters, but rather mm (?).

Från: Lowekamp, Bradley (NIH/NLM/LHC) [C] [mailto:blowekamp at mail.nih.gov]
Skickat: den 31 maj 2016 16:03
Till: Gustafsson Christian K <Christian.K.Gustafsson at skane.se>
Kopia: community at itk.org
Ämne: Re: [ITK] InvertDisplacementFieldImageFilter in SimpleITK

Hello,

My assumption would be that the error is in physical space and not pixels as this is standard ITK practice. While the documentation is rather sparse you can look at the source code to gain insight into these types of questions [1].

Also note that there is the InverseDisplacementFieldImageFilter. I don’t recall the difference and if one is generally preferred of the other.

HTH,
Brad

[1] https://github.com/InsightSoftwareConsortium/ITK/blob/1257b0468c147ba2b1a65bae67169bdf35f4fa50/Modules/Filtering/DisplacementField/include/itkInvertDisplacementFieldImageFilter.hxx#L215-L248

On May 31, 2016, at 8:40 AM, Gustafsson Christian K <Christian.K.Gustafsson at skane.se<mailto:Christian.K.Gustafsson at skane.se>> wrote:

Hello!

What is the unit of measurement that is used in the criterias MeanErrorToleranceThreshold and MaxErrorToleranceThreshold

/* Set/Get the mean stopping criterion */
                 itkSetMacro( MeanErrorToleranceThreshold, RealType );
                 itkGetConstMacro( MeanErrorToleranceThreshold, RealType );


  /* Set/Get the max stopping criterion */
                 itkSetMacro( MaxErrorToleranceThreshold, RealType );
                 itkGetConstMacro( MaxErrorToleranceThreshold, RealType );

in  InvertDisplacementFieldImageFilter in SimpleITK?

Is it amount of pixels?

Best regards
________________________________________
Christian Gustafsson
Medical Physicist, MRI, PhD candidate

Department of Radiation Physics
Klinikgatan 5
Skåne University Hospital
SE 221 85 Lund
+46 46 177647
Christian.K.Gustafsson at skane.se<mailto:Christian.K.Gustafsson at skane.se>

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