121 / 1544
Linac
Linac
Linac
Linac
“
Safety margins
incorporating motion
”
“
Gating
”
“
Dynamic couch
compensation
”
“
Tracking/Pusuit
”
-static beam
-static couch
-wide beam
-100% duty cycle
-static beam
-static couch
-small beam
-20-30% duty cycle
-static beam
-dynamic couch
-small beam
->90% duty cycle
-dynamic beam
-static couch
-small beam
->90% duty cycle
“
Very long treatment
ti es (duty cycle
20-30%)
”
“
Exposure of large
volumes of healthy
tissue
”
Conclusion
“
Some parts of the achine have to move
actively, responding real-time to tumor motion
for counteracting or pursuit
”