VSE knjižnice (vzajemna bibliografsko-kataložna baza podatkov COBIB.SI)
  • Comparison of four models for calculation of collimator scatter factors of linac photon beams = Primerjava štirih modelov izračunavanja kolimatorskih sipalnih faktorjev pri foronskih žarkih linearnega pospeševalnika
    Faj, Dario ; Bistrović, Matija
    Background. Two approaches for approximation of collimator scatter correction factors of rectangular fields can be found in recent publications. One is based on empirical equations or some more ... sophisticated physical models using certain parameters which have to be adjusted for a specific machine. The otheris based on an earlier proposed idea of decomposition of collimator scatter correction factor function of two variables - into the product of two functions of one variable. In this work four models, based on the decomposition, are compared. All these models are based on the measurement of the output variation while opening one of the two collimator blocks, the otherbeing opened at some fixed value. Material and methods. The measurements were carried out using nominal 6 MV and 15 MV X-ray beams of a Siemens linac and nominal 6 MV and 18 MV X-ray beams of a Varian linac. Results and conclusions. It was shown that better approximation can be achieved with a suitable choice of basic measurements and normalisation of data.
    Vir: Radiology and oncology. - ISSN 1318-2099 (Letn. 33, št. 4, december 1999, str. 303-308)
    Vrsta gradiva - članek, sestavni del
    Leto - 1999
    Jezik - angleški
    COBISS.SI-ID - 11071193

    Povezava(-e):

    Digitalna knjižnica Slovenije - dLib.si

vir: Radiology and oncology. - ISSN 1318-2099 (Letn. 33, št. 4, december 1999, str. 303-308)
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