The purpose of this study is to report and analyze patient skin motion data collected during CyberKnife stereotactic radiosurgery (SRS). The CyberKnife is a radiation treatment system that incorporates a robotic arm to precisely position a linear accelerator. While this capability is not currently commercially available, the CyberKnife could be programmed to move the radiation beam in real time to compensate for organ motion. This study serves as a first step towards our long-term goal of using skin motion to predict internal organ motion. This may lead to more precise radiation treatment delivery for mobile target volumes. To date, we have collected and analyzed skin motion data on four patients (two sacrum, one lung, one pancreas). The movement amplitudes of individual skin markers ranged from 3.1 to 14.8 mm with a median of 7.5 mm.
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