Radiation therapy is tolerated better and more precise since it can be focused directly on the tumour tissue to be destroyed. And this is where the protons have a huge advantage: The energy output of the protons after entry into the tissue is low at first and only rises abruptly after almost complete deceleration. A small “explosion” can be set to the exact millimetre. After the maximum dosage has been reached, the effect of the beam abruptly stops so that the healthy tissue immediately lying behind the tumour experiences virtually no stress.
Thus, the tolerability of the treatment is particularly suitable for patients. They can go about their daily lives without being affected by severe side effects. Furthermore, the risk of a secondary tumour decreases significantly as a long-term consequence of irradiation.
Given the absence of proton radiation behind the tumour, cancer cells that were not previously questioned can also be detected. These include tumours near the spinal cord or brain stem, bronchial carcinoma (lung cancer) or multiple metastases. For example, the irradiation of the retina becomes possible without damage to the underlying optic nerve and brain.