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Researchers Pave Way for Tracking of Prostate Motion With a Single kV Imager During Arc Radiotherapy
Date:3/3/2010

ated in real-time in order for the dynamic multi-leaf collimator (DMLC) to track tumor motion. To date, a combination of MV portal images and kV orthogonal images have been tested to achieve this.

"Acquiring mega-voltage images is not ideal during RapidArc because the DMLC can block the view of the target during the treatment," says Per Rugaard Poulsen, lead author of the research. "The kV image beam is not obscured by the treatment DMLC making the markers visible from all treatment angles, unlike with the MV beam."  

To test the system, arc radiotherapy was delivered to a 'motion phantom' implanted with fiducial markers while continuously imaging with the kV beam. The target position was determined from these images, acquired from different projections during the arc, enabling the researchers to determine information about its 3D motion. This single imager based DMLC tracking system was shown to have sub-millimeter accuracy for most types of prostate motion. Precise alignment of the treatment beam with the tumor position is vital in radiotherapy treatments, as it can reduce the likelihood of complications due to the treatment.  

"The results confirm what has been seen in simulation studies and show that the method is very robust to experimental uncertainties," adds Per Rugaar
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SOURCE Varian Medical Systems, Inc.
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