Changes in anatomy over the course of treatment
•
10 H&N – oropharingeal ca pts, IMRT
•
CBCT prospectively acquired weekly,
OARs dose/volume compared to the
planned CT
•
Evaluation of the use of KV CBCT for
dose monitoring and examine if
Fig. 1. Contouring parotid on cone beam
dosimetric impact of such changes on the
parotid and OARs require replanning
•
Patient weight loss (mean:7.5 kg) and
parotid volume shrinkage was observed,
but no significant excess dose to OAR
•
No need for replanning in this
patient cohort
(Ho
et al
2011)
computed tomography (CBCT) (b) using
planning CT (a) as reference
.