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Update specialized.rst
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jiperl committed Jul 15, 2021
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11 changes: 6 additions & 5 deletions parameters/geometry/specialized.rst
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Expand Up @@ -401,12 +401,13 @@ as part of a linear accelerator treatment head. The component is built from Gean

.. image:: Jaws.png

TsJaws component with select parameters set in the parameter control file shown in orange. In this
case there is an asymmetric pair of jaws upstream of a MLC bank. TransZ is at the middle of the
jaw (half thickness) and is provided as a changeable parameter in the TOPAS GUI even though it
is not present in a parameter control file.
TsJaws component with select parameters set in the parameter control file shown in orange. In this
case there is an asymmetric pair of jaws upstream of a MLC bank. TransZ is at the middle of the
jaw (half thickness) and is provided as a changeable parameter in the TOPAS GUI even though it
is not present in a parameter control file.

The following parameters are shown in the diagram above::

The following parameters are shown in the diagram above:
1. The SAD parameter is the source-axis distance; that is, the distance from the nominal source
position (x-ray target) to the gantry rotation axis (the machine isocenter).
2. The distance from the origin of the coordinate system to the jaw is calculated from the
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