Reconstruction
===============

Let's quickly perform a reconstruction to see the results. On the left panel, find the ``gold_nanoparticle_06.4dstem`` dataset, right-click on it, then go to the ``Reconstruction`` menu and select ``Virtual Image``. A new page will open on the right side for setting the parameters of the Virtual Image. For now, let's try reconstructing an annular dark field (ADF) image.

.. image:: /fig/SetReconstructionRegion.png
   :alt: Set Annular Dark Field Region

Here, we select ``Ring`` as the integration region, and set the inner radius to 45 pixels and the outer radius to 60 pixels. For the position of the integration region, set the horizontal offset to 2 and the vertical offset to -1. Once the parameters are set, click the red ``START CALCULATION`` button at the bottom.

.. note::

   If you don't see the red button, try scrolling down using the scroll bar on the right.

.. image:: /fig/StartComputingADF.png
   :alt: Start Computing ADF

Once everything is ready, the calculation will start. Similar to when loading a dataset, long-running tasks can be monitored in the ``Task`` panel on the left. After the calculation is complete, right-click on ``ADF.img``, select ``Open`` from the menu, and the image viewing page will open, just like when we viewed the 4D-STEM dataset earlier.

.. image:: /fig/ViewADF.png
   :alt: View ADF