User manual

96
PICKET FENCE ANALYSIS
Click on “Add New Case Object” under
the “Case Object Management” heading.
A drop-down menu will appear and give
you several options. Select “MLC Picket
Fence Physics QA” (Shown left). Next,
acquire the image by either reading it
from a saved file or scanning it directly.
For automated image registration, select the fiducial tool, and mark the fiducial
positions on the image as shown right. Any number of fiducials can be used to identify
the isocenter. However, the minimum number to determine both x, y shift and rotation is
three fiducials. When all fiducials are marked, select the tool, “MLC Picket Fence
Physics QA” in the case tree.
The isocenter
(blue/black dashed
lines) is automatically
fitted to the marked
fiducials as shown right.