N4ITK: Nick's N3 ITK Implementation For MRI Bias Field Correction
Tustison N., Gee J.
PICSL, University of Pennsylvania
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Please use this identifier to cite or link to this publication: http://hdl.handle.net/10380/3053
Several algorithms exist for correcting the nonuniform intensity in magnetic resonance images caused by field inhomogeneities. These algorithms constitute important preprocessing steps for subsequent image analysis tasks. One such algorithm, known as parametric bias field correction (PABIC), has already been implemented in ITK. Another popular algorithm is the nonuniform intensity normalization (N3) approach. A particularly salient advantage of this algorithm is that it does not require a prior tissue model for its application. In addition, the source code for N3 is publicly available at the McConnell Brain Imaging Centre (Montreal Neurological Institute, McGill University) which includes source code and the coordinating set of perl scripts. This submission describes an implementation of the N3 algorithm for the Insight Toolkit given as a single class, viz. itk::N3MRIBiasFieldCorrectionImageFilter. We tried to maintain minimal difference between the publicly available MNI N3 implementation and our ITK im- plementation. The only intentional variation is the substitution of an earlier contribution, i.e. the class itk::BSplineScatteredDataPointSetToImageFilter, for the originally proposed least-squares approach for B-spline fitting used to model the bias field. In addition, we include a more extensive modification to the original N3 algorithm found in the class itk::N4MRIBiasFieldCorrectionImageFilter. The latter algorithm employs a multi-resolution approach, similar to FFD image registration strategies, and has a slightly modified iterative update scheme.
Code
plus Automatic Testing Results by Insight-Journal Dashboard on Fri Jan 22 22:26:54 2010 for revision #9
starstarstarstarstar expertise: 5 sensitivity: 5
plus Automatic Testing Results by Insight-Journal Dashboard on Tue Oct 27 14:44:12 2009 for revision #6
starstarstarstarstar expertise: 5 sensitivity: 5
plus Automatic Testing Results by Insight-Journal Dashboard on Tue Oct 20 11:18:04 2009 for revision #5
starstarstarstarstar expertise: 5 sensitivity: 5
plus Automatic Testing Results by Insight-Journal Dashboard on Fri Jul 17 07:23:06 2009 for revision #4
starstarstarstarstar expertise: 5 sensitivity: 5

Reviews
minus Good contribution by Dženan Zukić on 2011-05-30 09:14:31 for revision #11
starstarstarstarstar expertise: 3 sensitivity: 5
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Summary:

A valuable contribution, which spares us from implementing the N3 method. It has basic documentation and a very complex example, but it lacks a simplest example.

Open Science:

Source code provided, as well as some images.

Reproducibility:

It compiles after ITK was configured to use reivew code. The complex example runs noticeably faster than the code I used:



typedef itk::N4MRIBiasFieldCorrectionImageFilter<RealImageType, CharImageType> CorrecterType;


CorrecterType::Pointer correcter=CorrecterType::New();


correcter->SetInput(reader->GetOutput());


correcter->Update();




Open source Contributions:

Code is usable, but the examples provided are long, and a straightforward use of the filter takes much longer than the provided examples.

Quality of the data :

I did not check the included data, I used my own data.

Interest:

Everyone who uses MR images.


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plus Very nice contribution for open source community by Andriy Fedorov on 2009-06-17 16:05:40 for revision #3
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plus Cannot Compile the program by Sylvain Bouix on 2009-05-21 15:29:36 for revision #1
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Categories: Filtering, IO
Keywords: MRI, bias field, inhomogeneity, ninjas,
Toolkit: ITK
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