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Dose distribution considerations of medium energy electron beams at extended source-to-surface distance.

Authors
  • Saw, C B
  • Ayyangar, K M
  • Pawlicki, T
  • Korb, L J
Type
Published Article
Journal
International Journal of Radiation Oncology*Biology*Physics
Publisher
Elsevier
Publication Date
Apr 30, 1995
Volume
32
Issue
1
Pages
159–164
Identifiers
PMID: 7721612
Source
Medline
License
Unknown

Abstract

In the region between the phantom surface and the depth of maximum dose, the depth-dose decreases as the SSD increases for all electron beam energies. The effects of extended SSD in the region beyond the depth of maximum dose are unobservable and, hence, considered minimal. Extended SSD effects are apparent for higher electron beam energy with small cone size causing the depth of maximum dose and the rapid dose fall-off region to shift deeper into the phantom. However, the change in the depth-dose curve is small. On the other hand, the rapid dose fall-off region is essentially unaltered when the large cone is used. The penumbra enlarges and electron beam flatness deteriorates with increasing SSD.

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