Jen Dietrich

To demonstrate a novel method of quantifying respiratory gating beam-on and beam-off latency for Varian TrueBeam linear accelerators and assess the impact of dose rate and machine-specific factors on overall timing performance.

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.