[ITK-users] 3D image centre

[Lowekamp, Bradley (NIH/NLM/LHC) [C]]

You are missing that application of your image’s orientation/direction cosine matrix.

I’d recommend computing the center index (as a ContinuousIndex type), and then using the Image::TransformContinuousIndexToPhysicalPoint[1] method.

HTH,
Brad

[1] https://itk.org/Doxygen/html/classitk_1_1ImageBase.html#ad3965f819b7d61e34605dc0331df0751

On Mar 5, 2017, at 6:48 PM, Dženan Zukić <dzenanz at gmail.com<mailto:dzenanz at gmail.com>> wrote:

Hi Fabio,

that sound right.

Regards,
Dženan

On Sun, Mar 5, 2017 at 5:14 PM, D'Isidoro Fabio <fisidoro at ethz.ch<mailto:fisidoro at ethz.ch>> wrote:
Hi,

since the image origin is defined in the middle of the “first” voxel and not at the very corner of the CT scan, I would calculate the image centre as:

               img_centre[0] = origin[0] + spacing[0] * static_cast<double>(size[0]) / 2.0 - spacing[0] / 2.;

Is that right?

Thank you


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