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Radiology, Vol 126, 249-251, Copyright © 1978 by Radiological Society of North America

ARTICLES

Effect of air space and depth dose in electron beam therapy

FM Khan, W Sewchand and SH Levitt

In electron beam therapy, alterations in dosimetry occur as a result of air space between the end-of-treatment cone and the skin surface. A large air gap may be introduced in order to obtain a field size larger than that available at the cone end. Needed dosimetry corrections related to these air space problems are discussed, along with a proposed method of measuring effective source-to-cone end distance. Data presented show the modifications of a dosimetric field which occur with an increase in the air space below the treatment cone.




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