Re: [ITK-users] Can I alter the way SliceBySliceImageFilter defines the origin of the internal slices?

Thanks for the quick reply!

(Btw, some code snippets disappeared from my first post, but they are not so
important).

Perhaps I missed something about the transformation to physical coordinates,
but this is my understanding:

The physical position P of the [5,5,0]-index pixel in the 3D volume
(according to my meta-data above) is:

P = O + D*diag(S)*Index = (0, 0, 0) + (0.3*5, 0.3*5, 1*0) = (1.5, 1.5, 0).

For a pixel in a different slice, say pixel [5, 5, 20], the physical point
is (1.5, 1.5, 20)

Now after slicing, the physical position (according to
SliceBySliceImageFilter) of the [5, 5]-pixel of any internal image created
by slicing is:

(recall new origin is (1.5, 1.5))

(1.5, 1.5) + (0.3*5, 0.3*5) = (3, 3).

The position of the [5, 5, 0]-pixel is thus (3, 3) after slicing, while it
was at (1.5, 1.5, 0) before slicing.
Similarly: The position of the [5, 5, 20]-pixel at (3, 3) after slicing,
while it was at (1.5, 1.5, 20) before slicing.

To me, it would make more sense for them to be at (1.5, 1.5).




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