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Ceberg

Crister Ceberg

Avdelningschef

Ceberg

The effects of divergence and nonuniformity on the x-ray pencil-beam dose kernel

Författare

  • Crister Ceberg
  • Bengt E. Bjärngard

Summary, in English

The scattered-photon part of pencil-beam dose kernels for high-energy x-ray beams can be derived experimentally by differentiating the broad-beam scatter-to-primary dose ratio as a function of radius. Formally, this requires a uniform and parallel beam, and the procedure is complicated by the nonideal, actual beam conditions: the primary dose profile is not uniform, the beam quality is not constant, and the distance to the source is not infinite. The experimentally determined scatter-to-primary ratios can be corrected for these effects before they are differentiated to give the pencil-beam kernels. The correction factors were calculated and shown to reach as much as 5% of the true scatter-to-primary ratio. The effect on the pencil beam was evaluated and corrected pencil beams were determined.

Avdelning/ar

  • Medicinsk strålningsfysik, Lund

Publiceringsår

1996

Språk

Engelska

Sidor

1531-1535

Publikation/Tidskrift/Serie

Medical Physics

Volym

23

Avvikelse

9

Dokumenttyp

Artikel i tidskrift

Förlag

John Wiley & Sons Inc.

Ämne

  • Biophysics

Aktiv

Published

ISBN/ISSN/Övrigt

  • ISSN: 0094-2405