Users Manual Part 6

Clinical User’s Guide
IBA | 48-19|
Volume 1 - Treatment Session
|Part XI
- Patient Positioning and Alignment Using the Universal Beam Triggering Interface
|
In Pencil Beam Scanning mode, the beam is switched On (i.e. beam is authorized)
when all the following conditions are met:
The beam has been allocated to the TR and it has not been paused by the RTT.
The Beam Triggering signal is On (i.e. beam is authorized).
The Scanning Controller has finished calculating the scanning map and the
map has been downloaded.
Beam Enabling/Disabling
Beam is enabled as long as all three aforementioned conditions are met. Beam
remains On as long as the Beam Triggering signal remains On (i.e. beam is
authorized), or until the entire map has been irradiated.
Beam is disabled on the falling edge of the Beam Triggering signal. If the previously
calculated map was not entirely irradiated, the scanning controller will calculate and
download a new map.
See Figure 48-10. Beam enabling is indicated by the upward arrow ( ); beam
disabling is indicated by the downward arrow ( ).
Figure 48-10 illustrates the triggering principle in the Pencil Beam Scanning
treatment mode.
Table 48-1. Triggering in Pencil Beam Scanning
Beam Triggering signal Off On Off On
Scanning Controller Computing/
Downloading
Computing/
Downloading
Ready Ready
Beam
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