Abstract #4146

Geometric accuracy of real-time tumor tracking and dynamic beam adaptation using the Australian MRI-Linear accelerator

Paul Zhi Yuan Liu¹, Urszula Jelen², Bin Dong², Gary Liney², and Paul Keall¹

¹Image X Institute, The University of Sydney, The University of Sydney, Australia, ²Department of Medical Physics, Ingham Institute for Applied Medical Research, Liverpool, Australia

A real-time tumor tracking system has been developed for MRI-guided radiation therapy. This system allows for tumor motion to be monitored during radiotherapy and for the radiation beam to be modified to compensate for this motion. The tumor location was found during treatment through the use of a template matching algorithm and 2D cine-MR images. The tumor location information was sent to a tracking algorithm that modifies the shape of the beam in real-time to ensure the tumor target is irradiated. The tumor tracking system has been tested and found to be of submilimeter accuracy.

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