With the help of technology from radiation therapy firm Varian Medical Systems, researchers in the U.S. and Denmark have devised a method for real-time tracking of prostate motion.
Physicists at Stanford University in Stanford, CA, and Aarhus University Hospital in Aarhus, Denmark, used the On-Board Imager from Palo Alto, CA-based Varian in image-guided targeting of prostate tumors during arc radiation therapy treatments.
The position of the target must be updated in real-time for the dynamic multileaf collimator to track tumor motion.
To test the system, arc radiation therapy 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.
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