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of pencil beam scanning, oncologists used a scattering method to direct a wide beam toward the tumor.

Passive scattering beam delivery

The first commercially available proton delivery systems used a scattering process, or passive scattering, to deliver the therapy. With scattering proton therapy the proton beam is spread out by scattering devices, and the beam is then shaped by putting items such as collimators and compensators in the path of the protons. The collimators were custom made for

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