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Adaptive planning- head and neck model
•
We usually adapt to
changes in morphology of tumor and OAR’s.
•
Provoking factors
: weight loss, tumor response, progression of disease
Hansen et al.
•
evaluated the impact of replanning in a cohort of
13 HNC patients
with either significant
weight loss or tumor response during IMRT.
•
Compared to
replanning,
not
replanning
significantly decreased dose to the target
volume and increased doses to normal tissues (spinal cord and brainstem). The
doses to
95% of the PTV-GTV and the PTV-CTV decreased by up to 6.3 Gy and 7.4 Gy,
respectively.