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[The radiobiological aspects in the blocking of sensitive structures from the irradiation field]
1Institut für Biophysik und Strahlenbiologie, Universität Hamburg.
Abstract
Background:
In some cases the total dose has to be reduced in a section of an irradiation field by means of a transmission block. This can be performed in 2 different ways: 1. A part of the planned fractions is blocked. 2. The dose of each fraction is reduced using a transmission block (transmission < 100%).
Method:
For both methods the biological tumor and normal tissue doses were calculated using the linear-quadratic model. A clinical case is discussed.
Result And Conclusion:
With transmission blocks a therapeutic gain can be obtained.