title: [The radiobiological aspects in the blocking of sensitive structures from the irradiation field].
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%).
  
  
  METHODS
  For both methods the biological tumor and normal tissue doses were calculated using the linear-quadratic model. A clinical case is discussed.
  
  
  CONCLUSIONS
  With transmission blocks a therapeutic gain can be obtained.
authors.affiliation: Institut für Biophysik und Strahlenbiologie, Universität Hamburg.
authors.forename: H H
authors.initials: HH
authors.lastname: Dubben
authors.forename: T
authors.initials: T
authors.lastname: Herrmann
mesh_terms: D002283:Carcinoma, Bronchogenic / Q000532:radiotherapy; D002294:Carcinoma, Squamous Cell / Q000532:radiotherapy; D006801:Humans; D016014:Linear Models; D008175:Lung Neoplasms / Q000532:radiotherapy; D008207:Lymphatic Metastasis; D008297:Male; D008875:Middle Aged; D010347:Patient Care Planning / Q000706:statistics & numerical data; D011836:Radiation Tolerance; D011879:Radiotherapy Dosage
vernacular_title: Strahlenbiologische Aspekte beim Ausblocken empfindlicher Strukturen aus dem Bestrahlungsfeld.