[Load to the lung and spinal cord in the treatment of exophageal carcinoma using telecentric-excentric pendulous 42 MeV betatron irradiation].

Based on measurements with the Alderson phantom as well as on computerized calculations derived from these measurements, a comparison is made between the loads to the lung and spinal cord during irradiation of the esophageal carcinoma by pendulous or fixed fields using photons with an energy of 42 MeV from a 42-MeV-betatron. The optimal dose distribution according to the isodose patterns presented is obtained by means of a combined irradiation technique using ventral fixed fields and telecentric-excentric pendulous irradiation under consideration of equal shares for the focal dose. This method is more appropriate than the other radiation techniques considered for saving the sound tissues concerned i.e. lung and spinal cord and nevertheless administering the necessary cancerocid dose to the tumor and the regionary lymph nodes.