Advanced TP

Tumour Motion Model

 Observations of movement in target and tumour-bearing organ:  Amplitude (b)

 Period ( τ )  Phase ( φ )

 Fit observation to a model  (Lujan, Med.Phys. 26(5) May 1999)

 z(t) = z o

– b*cos( π t / τ - φ ) 2n

 A predictive model could serve as a non-invasive means of estimating tumour position – gating or tracking

Adapted from J Hosiak