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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