.. index::
   pair: Picket Fence; Radiotherapy

.. _picketfence:

Picket Fence Analysis
=====================

Analyse a picket fence Multi-Leaf Collimator (MLC) test pattern. The analysis can be opened by clicking the |pf| button on the :ref:`rxtoolbar` or by selecting 'Radiotherapy, Picket Fence' from the :ref:`analysemenu`. The MLC type can be selected from a pop up window opened by a mouse long or right click on the |pf| button. The default MLC can be specified in :ref:`picketfencesettings` settings. MLC's that are currently implemented are:

*  Varian Millenium 120 leaf
*  Varian HD Millenium 120 leaf
*  B Mod 80 leaf
*  Elekta Agility 160 leaf
*  Elekta iMLC 80 leaf
*  Varian Halcyon Proximal and Distal 28 leaf.

While the default settings are usually sufficient certain settings can be changed as given in :ref:`picketfencesettings` settings. Please see the `Picket Fence Module <https://pylinac.readthedocs.io/en/latest/picketfence.html>`_ in the `Pylinac documentation <https://pylinac.readthedocs.io/en/latest/>`_ for more information.


.. |pf| image:: _static/PicketFence.png

.. |Note| image:: _static/Note.png