Dosimetric monitoring of radiotherapy fractions for offline treatment plan adaptation
Radiotherapy treatment plans are typically created on a CT scan acquired several days before the treatment starts. However, anatomical changes can be observed throughout the treatment course.
The dosimetric impact of observed anatomical changes can be inspected by calculating the treatment plan on the new anatomy, while, the cumulative impact of gradual and/or random anatomical changes can be examined by accumulating ‘daily delivered’ dose distributions on a reference anatomy.
In this presentation, several approaches for the calculation of daily delivered dose distributions based on the daily anatomy as observed on the online acquired cone-beam CT scans will be discussed. Then the implementation of the procedure with an automated workflow, using a commercial software will be presented.