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The effects of dive...
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Ceberg, CristerLund University,Lunds universitet,Medicinsk strålningsfysik, Lund,Sektion V,Institutionen för kliniska vetenskaper, Lund,Medicinska fakulteten,Medical Radiation Physics, Lund,Section V,Department of Clinical Sciences, Lund,Faculty of Medicine
(author)
The effects of divergence and nonuniformity on the x-ray pencil-beam dose kernel
- Article/chapterEnglish1996
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LIBRIS-ID:oai:lup.lub.lu.se:b5346f30-bfee-4e0f-921a-2b4008c1f5b2
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https://lup.lub.lu.se/record/1110738URI
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https://doi.org/10.1118/1.597884DOI
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Language:English
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Summary in:English
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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.
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Bjärngard, Bengt E.
(author)
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Medicinsk strålningsfysik, LundSektion V
(creator_code:org_t)
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In:Medical Physics: Wiley23:9, s. 1531-15350094-2405
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