How does proton therapy work?

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Design for a modulator wheel. Due to the sophisticated manufacture, the dose distribution of protons passing through a rotating wheel like this becomes homogeneous in depth.




Shape of the irradiation field

The tumour outline not only defines the shape of the depth dose curve to be applied, but sets the lateral margin of the proton beam that is directed to the patient's eye, too. For each patient, an individual brass collimator is computed and produced to shield the healthy parts of the eye.

Beam preparation scheme. On its way to the target, the proton beam passes several beam shaping elements such as range shifter, modulator wheel, and the patient's collimator. With X-ray and TV camera systems, one is able to control the position of the eye.