Plot metric values after each iteration

[AmericaBG]

Hi! I would like to plot the metric value after each iteration to check that my registration converges.

Could you say me how to do that? In Elastix documentation, I have seen some class and parameters [https://elastix.lumc.nl/doxygen/classelastix_1_1MetricBase.html] but I don't know how to apply them in Python with simpleElastix.

Thank you very much in advance!

[sorenchr2011]

Hi, You can switch on output of the iteration log file for this:

SimpleElastix.SetParameter("WriteIterationInfo",["true"]) and then

td = tempfile.mkdtemp() SimpleElastix.SetOutputDirectory(td)

.. execute registration ....

then

xfms = sorted(glob.glob(os.path.join(td, 'TransformParameters..R'))) dbg_xfms = dict([ (os.path.basename(k),sitk.ReadParameterFile(k)) for k in xfms])

Then parse the dbg_xfms as you see fit.

Soren

On Wed, Sep 16, 2020 at 5:34 PM América Bueno Gómez < [email protected]> wrote:

Hi! I would like to plot the metric value after each iteration to check that my registration converges.

Could you say me how to do that? In Elastix documentation, I have seen some class and parameters ([ https://elastix.lumc.nl/doxygen/classelastix_1_1MetricBase.html]) but I don't know how to apply them in Python with simpleElastix.

Thank you very much in advance!

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