502 / 1578
Tumor tracking: couch compensation
Dynamic couch compensation
“Keeping
the tumor position fixed in space
by
counteracting motions
of the treatment
couch and irradiate with
a static beam”
•
Advantages
:
Ø
Free breathing
Ø
Linac can operate as in a static situation
•
Drawbacks
:
Ø
Dynamic behavior of the couch (weight distr.)
Ø
Complex feedback control system for couch
motion
Ø
Discomfort patient? Relaxing?
Ø
Impact on tumor motion, patient positioning?
Ø
Changing position of beam with respect to
patient anatomy
Linac
Courtesy O. Haas
SBRT 2017 - D. Verellen