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Monte Carlo modeling of small photon fields: quantifying the impact of focal spot size on source occlusion and output factors, and exploring miniphantom design for small-field measurements.

Abstract:

The accuracy with which Monte Carlo models of photon beams generated by linear accelerators (linacs) can describe small-field dose distributions depends on the modeled width of the electron beam profile incident on the linac target. It is known that the electron focal spot width affects penumbra and cross-field profiles; here, the authors explore the extent to which source occlusion reduces linac output for smaller fields and larger spot sizes. A BEAMnrc Monte Carlo linac model has been used ...

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Publication status:
Published

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Publisher copy:
10.1118/1.3152866

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Institution:
University of Oxford
Department:
Oxford, MSD, Oncology
Journal:
Medical physics
Volume:
36
Issue:
7
Pages:
3132-3144
Publication date:
2009-07-05
DOI:
ISSN:
0094-2405
URN:
uuid:ddbdbd40-ec93-47aa-95e0-376ed7335aaf
Source identifiers:
228635
Local pid:
pubs:228635

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