The impact of the ClearRT upgrade on target motion tracking accuracy in Radixact Synchrony lung treatments.

Background: The objective was to investigate the change in segmentation error of Radixact Synchrony lung treatment after its kV imaging system was upgraded from Generation 1 to Generation 2 in the ClearRT™ installation.

Materials And Methods: Radixact Lung Synchrony plans were created for the Model 18023 Xsight Lung Tracking "XLT" Phantom combined with different lung target inserts with densities of 0.280, 0.

A novel method for monitoring the constancy of beam path accuracy in CyberKnife.

The aim of current work was to present a novel evaluation procedure implemented for checking the constancy of beam path accuracy of a CyberKnife system based on ArcCHECK. A tailor-made Styrofoam with four implanted fiducial markers was adopted to enable the fiducial tracking during beam deliveries. A simple two-field plan and an isocentric plan were created for determining the density override of ArcCHECK in MultiPlan and the constancy of beam path accuracy respectively.

Development of a novel methodology for QA of respiratory-gated and VMAT beam delivery using Octavius 4D phantom.

The objective of this study was to develop and evaluate a series of quality assurance (QA) techniques based on Octavius 4D phantom for testing of respiratory-gated treatment delivery, integrity of dose rate vs gantry speed in volumetric-modulated arc therapy (VMAT) commissioning, and multileaf collimator (MLC) positioning accuracy of a linear accelerator. An Octavius 4D phantom capable of rotating with the gantry and recording the detector signal with a sampling rate of 10 Hz was isocentrally set up and an inclinometer was also installed to measure the gantry angle simultaneously. A simple arc test was created and delivered with gating function activated to measure the timing accuracy of the gating window.