  External beam X-ray therapy (XRT) and proton therapy (PT) are effective and
widely accepted forms of treatment for many types of cancer. However, the
procedures require extensive computerized planning. Current planning systems
for both XRT and PT have insufficient visual aid to combine real patient data
with the treatment device geometry to account for unforeseen collisions among
system components and the patient. We are proposing a cost-effective method to
extract patient specific S-reps in real time, and combine them with the
treatment system geometry to provide a comprehensive simulation of the XRT/PT
treatment room. The X3D standard is used to implement and deploy the simulator
on the web, enabling its use not only for remote specialists' collaboration,
simulation, and training, but also for patient education.
