London Health Science Center

To quantify the effects of respiratory motion and target size on internal target volume (ITV) geometric accuracy and Hounsfield Units (HU) stability in fast (6 s) and slow (60 s) thoracic HyperSight CBCT acquisitions.

To characterize the dependence of relative electron density (RED) to Hounsfield unit (HU) calibration accuracy on acquisition and reconstruction settings on the Varian Ethos HyperSight CBCT to assess implications for adaptive radiotherapy dose calculation.