Will we need proton therapy in the future?
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چکیده
Fig 1: Comparison of the depth dose profiles of proton and photon beams. The photon dose falls off exponentially with depth (green curve). A mono-energetic proton beam is characteriled by the presence of the Bragg peak in the region where the protons stop (red profile). Through the superposition (blue curve) of many proton beams of different residual range it is possible to deposit a homogenous dose (SOBP) in the region of the tumor (in this case from 15 to 25 cm depth).One recognizes from the picture the potential of dose sparing of the protons in the entrance and exit region of the beam (the unnecessary dose is painted in pale blue and light yellow). 40 30 15 MeV photons protons SOBP
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