Dose calculation in static or dynamic off‐axis fields
作者:
David D. Loshek,
Timothy T. Parker,
期刊:
Medical Physics
(WILEY Available online 1998)
卷期:
Volume 21,
issue 3
页码: 401-410
ISSN:0094-2405
年代: 1998
DOI:10.1118/1.597386
出版商: American Association of Physicists in Medicine
数据来源: WILEY
摘要:
X‐ray fields that are shifted away from the conventional central axis exhibit alterations in output, beam profile, and beam energy. An extension of a conventional dose calculation algorithm to correct for these perturbations is presented. This algorithm employs the product of three functions describing the dose at the center of the field atdmax, the relative off‐center dose atdmax, and the relative dose at depth along a fanline passing through the point of interest. The nature of the problem is characterized, a basic data set necessary to support the algorithm is described and an abridged set of data that may assist in the development of an independent collimator dose calculation capability is presented. The appropriateness of this technique for both conventional and dynamically collimated fields is illustrated.
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