MOSAIQ User's Guide - UCSF Radiation Oncology

MOSAIQ User’s Guide
11. Select the desired Fit Method. If you select Intrusive constraint, then a fit is performed
with an intrusive constraint and all subsequent Fits are performed with an intrusive
constraint - likewise for the Centered and Non-Intrusive constraints.
Intrusive changes the parameters so that more of the shape is covered and the leaves
intrude into the MLC shape. Non-intrusive changes the parameters and leaf positions so
that the leaves do not intrude into the MLC shape. Centered changes the parameters and
leaf positions so that they partly intrude into the MLC shape.
12. Click OK to save your changes and close the Beam’s Eye View dialog box.
The Treatment Field Definition dialog box opens.
13. Type the desired gantry angle in the Gantry Angle field.
14. Save your changes to the treatment field.
Changing an MLC Leaf Plan
Changing an MLC leaf plan is a simple process. You simply click the leaf you want to move
and drag it to the desired position. Bear in mind that you are constrained by your Machine
Characterization.
Mouse Functions
Clicking the left mouse button on a leaf activates the leaf for editing.
Clicking the left mouse button at a location where the active leaf could be placed
moves the leading edge of the active leaf to that position.
Clicking the left mouse button on a leaf and dragging the mouse within the area
where the active leaf can be placed moves the leading edge of the active leaf as you
move the mouse.
Dragging the mouse into the leaf opposing the edit leaf butts the edit leaf into the
opposing leaf (in accordance with Machine Characterization).
Dragging the mouse beyond a positional limit for that leaf moves the active leaf to
the positional limit.
Shift-clicking the left mouse button within the area of a jaw activates the jaw for
editing. For best results, always choose the central area of a jaw.
Shift-clicking the left mouse button at a location where the active jaw could be
placed moves the leading edge of the active jaw to that position.
Shift-clicking the left mouse button and dragging the mouse to a location at which
the active jaw can be placed drags the leading edge of the active jaw as you move the
mouse.
Shift-dragging the mouse to the edge of the opposing jaw butts the active jaw against
the opposing jaw.
Shift-dragging the mouse beyond a positional limit for that jaw moves the active jaw
to the jaw positional limit.
132 Copyright 2010, Elekta Impac Software
LUGMSQ0002/4.0/23-Sep-2010