Users Manual Part 2

IBA | 20-6 |
Clinical User’s Guide
Volume 1 - Treatment Session
|Part III
- The Pencil Beam Scanning (PBS) Suite Pencil Beam Scanning Principles
|
In-Layers Repainting
From the distal to the proximal edge of the target volume, each defined layer is
scanned by the proton beam (or painted) as many times as prescribed until the total
dose prescribed for that layer is delivered. Only when a given layer has received its
full dose, the scanning process progresses on to the next layer.
Decrease in Energy
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 the distal edge of the tumor. 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.
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.
None (no layer repainting)
From the distal to the proximal edge of the target volume, each defined layer is
scanned by the proton beam (or painted) once. The prescribed dose is delivered
completely for each spot in the target in just one scanning operation.
Mixed Repainting
In this mode, different types of repainting are mixed for the same beam.