A widely tested model for head scatter influence on photon beam output

Radiotherapy and Oncology

Volumn 67, Issue 2, 2003, Pages 225-238

  Olofsson, Jörgen ^a   Georg, Dietmar ^b   Karlsson, Mikael ^a  

^a UMEÅ UNIVERSITY   (Sweden)

^b MEDICAL UNIVERSITY OF VIENNA   (Austria)

Author keywords

Extra focal scatter source; Output factor in air; Semi analytical head scatter model

Indexed keywords

ARTICLE; CALCULATION; CLINICAL STUDY; COLLIMATOR; EXPERIMENTAL TEST; GEOMETRY; HEAD; MEASUREMENT; MODEL; PHOTON; PRIORITY JOURNAL; RADIATION BEAM; RADIATION DOSE;

EID: 0038176483     PISSN: 01678140     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0167-8140(02)00409-7     Document Type: Article

References (28)

1. Ahnesjö A., Knöös T., Montelius A. Application of the convolution method for calculation of output factors for therapy photon beams. Med Phys. 19:1992;295-301.
2. Ahnesjö A. Analytical modeling of photon scatter from flattening filters in photon therapy beams. Med Phys. 21:1994;1227-1235.
3. Ahnesjö A. Collimator scatter in photon beams. Med Phys. 22:1995;267-278.
4. Ahnesjö A., Weber L., Nilsson P. Modeling transmission and scatter for photon beam attenuators. Med Phys. 22:1995;1711-1720.
5. Das I.J., Desobry G.E., McNeeley S.W., Cheng E., Schutheiss T.E. Beam characteristics of a retrofitted double focused multileaf collimator. Med Phys. 25:1998;1676-1684.
6. Dutreix A, Svensson H, Bjärngard BE, Bridier A, Mijnheer B, Shaw J. Monitor unit calculation for high energy photon beams. Physics for clinical radiotherapy, Booklet No. 3, Leuven Garant 1997.
7. Dunscombe N., Nieminen J.M. On the field size dependence of relative output factors from a linear accelerator. Med Phys. 19:1992;1441-1444.
8. Georg D. Monitor unit calculation on the beams axis of open and wedged asymmetric high-energy photon beams. Phys Med Biol. 44:1999;2987-3007.
9. Hounsell A.R., Wilkinson J.M. The variation in output of symmetric, asymmetric and irregularly shaped wedged radiotherapy fields. Phys Med Biol. 41:1996;2155-2172.
10. Hounsell A.R., Wilkinson J.M. Head scatter modeling for irregular field shaping and beam intensity modulation. Phys Med Biol. 42:1997;1737-1749.
11. Jiang S.B., Boyer A.L., Ma C.M. Modeling the extrafocal radiation and monitor chamber backscatter for photon beam dose calculation. Med Phys. 28:2001;55-66.
12. Jursinic P. Clinical implementation of a two-component x-ray source model for calculation of head scatter factors. Med Phys. 24:1997;2001-2007.
13. Karlsson M., Karlsson M., Sjögren R., Svensson H. Semi-conductor detectors in output factor measurements. Radiother Oncol. 42:1997;293-296.
14. Kase K., Svensson G.K. Head scatter data for several linear accelerators (4-18MV). Med Phys. 13:1986;530-532.
15. Kim S., Palta J., Zhu T.C. The equivalent square concept for the head scatter based on scatter from flattening filter. Phys Med Biol. 43:1998;1593-1603.
16. Kim S., Liu C., Chen C., Palta J.R. Two effective source method for the calculation of in-air output at various source to detector distances in wedged fields. Med Phys. 26:1999;949-955.
17. Lam K.L., Muthuswamy S., TenHaken R.K. Flattening filter based empirical methods to parameterise the head scatter factor. Med Phys. 23:1996;343-352.
18. Liu H., Mackie T.R., McCullogh E.C. Calculating output factors for photon beam radiotherapy using a convolution/superposition method based on a dual source photon beam model. Med Phys. 24:1997;1975-1985.
19. Luxton G., Astrahan M.A. Output factor constituents of a high-energy photon beam. Med Phys. 15:1988;88-91.
20. Naqvi S.A., Sarfaraz M., Holmes T., Yu C.X., Li X.A. Analysing collimator structure effects in head-scatter calculations for IMRT class fields using scatter raytracing. Phys Med Biol. 46:2001;2009-2028.
21. Philips M.H., Singer M.K., Hounsell A.R. A macropencil beam model: clinical implementation for conformal radiotherapy and intensity modulated radiotherapy. Phys Med Biol. 44:1999;1067-1088.
22. Rosen L.M.D. II, Lane R.G. Collimator scatter in modelling radiation beam profiles. Med Phys. 17:1990;422-428.
23. Sharpe M.B., Jaffray D.A., Battista J.J., Munro P. Extra focal radiation: A unified approach to the prediction of beam penumbra and output factors for megavoltage x-ray beams. Med Phys. 22:1995;2065-2074.
24. Van Gasteren JJM, Heukelom S, Jager HN, Mijnheer BJ, van Kleffens HJ, van der Laarse R, Venselaar JLM, Westermann CF. Determination and use of scatter correction factors of megavoltage photon beams. Netherlands Commission on Radiation Dosimetry, NCS Report 12, 1998.
25. Weber L., Nilsson P., Ahnesjö A. Build-up cap materials for measurement of photon head scatter factors Phys. Med Biol. 42:1997;1875-1886.
26. Yu M.K., Murray B., Sloboda R. Parametrization of head scatter factors for rectangular photon fields using an equivalent square formalism. Med Phys. 22:1995;1329-1332.
27. Yu M.K., Sloboda R. Analytical representation of head scatter factors for shaped photon beams using a two-component x-ray source model. Med Phys. 22:1995;2045-2055.
28. Yu M.K., Sloboda R. Effect of beam blocking on linac head scatter factors. Int J Radiat Oncol Biol Phys. 37:1997;465-468.