• 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

    A dosimetric intercomparison of megavoltage photon beams in UK radiotherapy centres.

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Authors
    Thwaites, D I
    Williams, J R
    Aird, E G
    Klevenhagen, S C
    Williams, Peter C
    Affiliation
    Department of Medical Physics and Medical Engineering, University of Edinburg, UK.
    Issue Date
    1992-02
    
    Metadata
    Show full item record
    Abstract
    A dosimetry intercomparison has been carried out for all 64 radiotherapy centres in the UK. Doses were measured with an ionization chamber in an epoxy resin water-substitute phantom of relatively simple geometry. Reference-point measurements were made for all MV photon beams. For 61 Co-60 beams, a mean ratio of measured-to-stated dose of 1.002 was observed with a standard deviation of 0.014, whilst for 100 MV x-ray beams, the corresponding figures were 1.003 and 0.015. 97% of beams lay within a +/- 3% deviation. One measurement was instrumental in discovering a large discrepancy. Doses were also investigated in two planned three-field distributions at one beam quality in each centre. One of these was in a homogeneous phantom, whilst the second included a lung-equivalent insert. Doses were measured at the central point and at four other points in the high dose volume. In both situations, the mean ratio of measured-to-calculated doses for all points was 1.008, with standard deviations of 0.027 and 0.035 for the uniform and non-uniform phantoms, respectively. Discrepancies over 5% were followed up. The work must be viewed in the context of other international intercomparisons and is an essential part of wider radiotherapy audit processes.
    Citation
    A dosimetric intercomparison of megavoltage photon beams in UK radiotherapy centres. 1992, 37 (2):445-61 Phys Med Biol
    Journal
    Physics in Medicine and Biology
    URI
    http://hdl.handle.net/10541/109640
    DOI
    10.1088/0031-9155/37/2/011
    PubMed ID
    1553393
    Type
    Article
    Language
    en
    ISSN
    0031-9155
    ae974a485f413a2113503eed53cd6c53
    10.1088/0031-9155/37/2/011
    Scopus Count
    Collections
    All Christie Publications

    entitlement

    Related articles

    • A dosimetric intercomparison of kilovoltage X-rays, megavoltage photons and electrons in the Republic of Ireland.
    • Authors: Nisbet A, Thwaites DI, Sheridan ME
    • Issue date: 1998 Jul
    • A dosimetric intercomparison of electron beams in UK radiotherapy centres.
    • Authors: Nisbet A, Thwaites DI
    • Issue date: 1997 Dec
    • Quality audit of megavoltage radiotherapy units: intercomparison of dose at a reference point using a mailed TL-dosimetry system.
    • Authors: Davis B, Faessler P
    • Issue date: 1993 Jul
    • A dosimetric quality audit of photon beams by the Belgian Hospital Physicist Association.
    • Authors: Hoornaert MT, Van Dam J, Vynckier S, Bouiller A
    • Issue date: 1993 Jul
    • Quality assurance network in central Europe. External audit on output calibration for photon beams.
    • Authors: Izewska J, Novotny J, Gwiazdowska B, Kindlova A, Kontra G, van Dam J, Dutreix A, van der Schueren E
    • Issue date: 1995
    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.