• Login
    View Item 
    •   Home
    • The Christie Research Publications Repository
    • All Christie Publications
    • View Item
    •   Home
    • The Christie Research Publications Repository
    • All Christie Publications
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of ChristieCommunitiesTitleAuthorsIssue DateSubmit DateSubjectsThis CollectionTitleAuthorsIssue DateSubmit DateSubjectsProfilesView

    My Account

    LoginRegister

    Local Links

    The Christie WebsiteChristie Library and Knowledge Service

    Statistics

    Display statistics

    Electron contamination and build-up doses in conformal radiotherapy fields.

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Authors
    Hounsell, Alan R
    Wilkinson, John M
    Affiliation
    North Western Medical Physics, Christie Hospital NHS Trust, Manchester, UK. alan.hounsell@physics.cr.man.ac.uk
    Issue Date
    1999-01
    
    Metadata
    Show full item record
    Abstract
    The dose in the build-up region depends upon the primary photon beam, backscattered radiation from the patient and contamination radiation from outside the patient. In this paper, a model based on measured data is proposed which allows the build-up dose for arbitrarily shaped treatment fields to be determined. The dose in the build-up region is assumed to comprise a primary photon component and a contamination component that is a function of the field size and shape. This contamination component, for modelling purposes, is subdivided into contributions that correspond to elements of 1 cm by 1 cm cross-sectional area at the plane of the isocentre. The magnitude of these components has been obtained by fitting measured data to an exponential function. The exponent was found to vary linearly with depth for energies between 4 MV and 20 MV. The coefficient decreased linearly with depth at 4, 6 and 8 MV, but exhibited a broad build-up region at 20 MV. The primary component, in the build-up region, could be approximated by a 100 - (100 - PSD) e(-mu d) function, where PSD is the primary surface dose. The values obtained during the fitting procedure were used to calculate dose in the build-up region for arbitrarily shaped fields. Good agreement was found in each case.
    Citation
    Electron contamination and build-up doses in conformal radiotherapy fields. 1999, 44 (1):43-55 Phys Med Biol
    Journal
    Physics in Medicine and Biology
    URI
    http://hdl.handle.net/10541/87913
    DOI
    10.1088/0031-9155/44/1/005
    PubMed ID
    10071874
    Type
    Article
    Language
    en
    ISSN
    0031-9155
    ae974a485f413a2113503eed53cd6c53
    10.1088/0031-9155/44/1/005
    Scopus Count
    Collections
    All Christie Publications

    entitlement

    Related articles

    • The development and experimental evaluation of a simple analytical model for the TPR in the build-up region of megavoltage photon beams.
    • Authors: Godin M, Galiano E
    • Issue date: 2012 Jan
    • Electron contamination in 8 and 18 MV photon beams.
    • Authors: Zhu TC, Palta JR
    • Issue date: 1998 Jan
    • Monte Carlo study of in-field and out-of-field dose distributions from a linear accelerator operating with and without a flattening-filter.
    • Authors: Almberg SS, Frengen J, Lindmo T
    • Issue date: 2012 Aug
    • Modelling of electron contamination in clinical photon beams for Monte Carlo dose calculation.
    • Authors: Yang J, Li JS, Qin L, Xiong W, Ma CM
    • Issue date: 2004 Jun 21
    • Experimental verification of a commercial Monte Carlo-based dose calculation module for high-energy photon beams.
    • Authors: Künzler T, Fotina I, Stock M, Georg D
    • Issue date: 2009 Dec 21
    DSpace software (copyright © 2002 - 2025)  DuraSpace
    Quick Guide | Contact Us
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.