[Excentric rotation irradiation in ORL tumors]

A risk of dose insufficiency in the regions situated laterally to the spine and diagonally behind the spine is shown for the irradiation schemes applied hitherto in ORL tumors. In every case the fields are arranged in such a way that the myelon is not exposed to radiation. The excentric rotation technique presented guarantees that the exposition of the myelon doses not exceed 50% of the maximum dose. The axis lays within the myelon itself, and the central rays show an excentric deviation of 3 to 4 degrees. Thus a homogeneous dose distribution is achieved for the complete head and neck section.