Medical Physics Seminar – Monday, October 5, 2020
Radixact Motion Synchronization Development Experience
Michael Kissick
Physicist, Research and Development, Accuray, Inc.; Adjunct Assistant Professor, Department of Medical Physics, University of Wisconsin-Madison
Synchrony for Radixact created by Accuray, Inc. will be introduced. This unique system uses sequential 2D monoscopic kV images from the Tomotherapy ring gantry to find objects in 3D with cross-correlation techniques. A correlation model to surface marker movement for respiratory motion is then built such that we overcome system latency and steer the MV treatment beam with a sophisticated predictive model to submillimeter precision. This differs from gating approaches to motion management in significant ways. In order to develop this product, a variety of phantoms were used. Testing needed well-validated integrated systems, development required very realistic systems, and other purposes required them to be more simplistic and/or clever in how they work. R&D work in industry differs in some significant ways from academic research. There is much more to a science project that you sell to other people than just science.