.. note::
    :class: sphx-glr-download-link-note

    Click :ref:`here <sphx_glr_download_auto_examples_09_reconstruct_astra.py>` to download the full example code
.. rst-class:: sphx-glr-example-title

.. _sphx_glr_auto_examples_09_reconstruct_astra.py:


Example 09: Reconstruct data using ASTRA
========================================


.. code-block:: default


    import foam_ct_phantom
    import astra
    import numpy as np
    import h5py
    import pylab as pl
    pl.gray()

    # Run 03_generate_projections_parallel.py and 04_generate_projections_cone first

    projs = foam_ct_phantom.load_projections('test_projs_par.h5')

    vol_geom = foam_ct_phantom.VolumeGeometry(256, 256, 256, 3/256)

    proj_geom = foam_ct_phantom.ParallelGeometry.from_file('test_projs_par.h5')

    pg = proj_geom.to_astra(single_slice=True)
    vg = vol_geom.to_astra(single_slice=True)

    pid = astra.create_projector('cuda', pg, vg)
    w = astra.OpTomo(pid)

    mid_slice = w.reconstruct('FBP_CUDA', projs[:,projs.shape[1]//2])

    pl.imshow(mid_slice)
    pl.show()

    astra.projector.delete(pid)

    projs = foam_ct_phantom.load_projections('test_projs_cone.h5')

    proj_geom = foam_ct_phantom.ConeGeometry.from_file('test_projs_cone.h5', usecuda=False)

    pg3d = proj_geom.to_astra()
    vg3d = vol_geom.to_astra()

    pid = astra.create_projector('cuda3d', pg3d, vg3d)
    w = astra.OpTomo(pid)

    cone_rec = w.reconstruct('FDK_CUDA', projs.swapaxes(0,1))

    pl.imshow(cone_rec[cone_rec.shape[0]//2],vmin=0,vmax=3/256)
    pl.show()







.. _sphx_glr_download_auto_examples_09_reconstruct_astra.py:


.. only :: html

 .. container:: sphx-glr-footer
    :class: sphx-glr-footer-example



  .. container:: sphx-glr-download

     :download:`Download Python source code: 09_reconstruct_astra.py <09_reconstruct_astra.py>`



  .. container:: sphx-glr-download

     :download:`Download Jupyter notebook: 09_reconstruct_astra.ipynb <09_reconstruct_astra.ipynb>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_