[Insight-users] Coordinates in ITK

[JOJOW]

In medical image processing, there are  three kinds of coordinate system:
world, anatomical and image coordinate system. The latter two are more
commonly used. In ITK, LPS is used as anatomical system. 

In ITK, 

PointType p0; 
p0[0] = -1.0; // x coordinate 
p0[1] = -1.0; // y coordinate 
p0[2] = 10.0; // z coordinate 
are used to set the coordinate of a point. If I write p0 to a txt file, I
get [-1,-1,10]. 

ImageType::IndexType pixelIndex; 
pixelIndex[0] = 27; // x position 
pixelIndex[1] = 29; // y position 
pixelIndex[2] = 37; // z position 
are used to set the position of a voxel. 

My question is 
How are the coordinate systems built for PointType and ImageType::Index? 
If I read an nii image in MRIcroN, what is the relationship between X,Y,Z in
MRIcroN and PointType coordinate or pixelIndex coordinate in ITK? 
What is the relationship between  PointType coordinate and pixelIndex
coordinate in ITK? 

Best regards!

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