Users Manual Part 2

Clinical User’s Guide IBA | 22-5|
Volume 1 - Treatment Session
|Part III - The Pencil Beam Scanning (PBS) Suite PBS Multiple Repainting |
Representation
This repainting type is represented by an icon on adaPTdeliver screens.
Figure 22-5. Decrease in Energy Icon
Graph
Figure 22-6 illustrates the energy that is delivered in each layer. A graph similar to this
one appears on adaPTdeliver screens.
Figure 22-6. Decrease in Energy Energy/Layer Graph
(typical)
Back and Forward
From the distal to the proximal edge of the target volume, each defined layer is
scanned by the proton beam (or painted) once. When the proton beam finishes the
scan of the layer that ends at the proximal edge of the target volume, the repainting
process restarts at that same layer. The beam scanning process now advances from
the proximal layer to the distal one. This process is repeated as many times as
necessary until the prescribed dose is delivered for every spot in every layer of the
target volume.