Evaluation of radixact motion synchrony for 3D respiratory motion: Modeling accuracy and dosimetric fidelity.

Journal of Applied Clinical Medical Physics
William S FerrisJennifer B Smilowitz

Abstract

The Radixact® linear accelerator contains the motion Synchrony system, which tracks and compensates for intrafraction patient motion. For respiratory motion, the system models the motion of the target and synchronizes the delivery of radiation with this motion using the jaws and multi-leaf collimators (MLCs). It was the purpose of this work to determine the ability of the Synchrony system to track and compensate for different phantom motions using a delivery quality assurance (DQA) workflow. Thirteen helical plans were created on static datasets from liver, lung, and pancreas subjects. Dose distributions were measured using a Delta4® Phantom+ mounted on a Hexamotion® stage for the following three case scenarios for each plan: (a) no phantom motion and no Synchrony (M0S0), (b) phantom motion and no Synchrony (M1S0), and (c) phantom motion with Synchrony (M1S1). The LEDs were placed on the Phantom+ for the 13 patient cases and were placed on a separate one-dimensional surrogate stage for additional studies to investigate the effect of separate target and surrogate motion. The root-mean-square (RMS) error between the Synchrony-modeled positions and the programmed phantom positions was <1.5 mm for all Synchrony deliveries with the ...Continue Reading

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Citations

Jan 21, 2021·International Journal of Radiation Oncology, Biology, Physics·Carri K Glide-HurstEvan Wuthrick
Mar 30, 2021·Journal of Applied Clinical Medical Physics·William S FerrisJohn E Bayouth
Aug 21, 2021·Biomedical Physics & Engineering Express·Bin YangSiu Ki Yu

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Methods Mentioned

BETA
irradiating

Software Mentioned

MATLAB®
Precision
Radixact
CK Synchrony
Synchrony
Delta4
Synchrony®

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