PMID: 9434294Jan 22, 1998Paper

Is there a need for a revised table of equivalent square fields for the determination of phantom scatter correction factors?

Physics in Medicine and Biology
J L VenselaarC F Westermann

Abstract

The use of the British Journal of Radiology (BJR) (supplement 17) tables of equivalent square fields for dose calculations is widespread. A revised version of the supplement was published recently, with a more elaborate discussion, but without changes in data given in these tables (Br. J. Radiol. suppl 25). The tables were generated for use in dose calculations, with relative beam data such as PDD, BSF, PSF, all with d(max) as the reference depth. However, the current philosophy in dose calculational methods is based on quantities defined at a reference depth, d(ref) = 10 cm, on a separation of phantom and head scatter, and on the use of the relative depth-dose or tissue-phantom ratios normalized at d(ref). By using these quantities as a starting point, problems at shallow depths related to the influence of contaminating electrons in the beam can be eliminated. Recently, a comprehensive set of phantom scatter factor data with d(ref) = 10 cm has been published for a set of square field sizes and a wide range of photon beam energies, showing that phantom scatter is a smoothly varying function of field size and quality index. It is not a priori evident that the conventional concept of equivalent squares for rectangular fields is a...Continue Reading

References

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Citations

Apr 6, 2001·International Journal of Cancer. Journal International Du Cancer·M HossainM S Huq
Aug 22, 2001·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·D GeorgJ Venselaar
Sep 21, 2004·Medical Physics·Dietmar GeorgMikael Karlsson
May 5, 2012·Journal of Medical Physics·Seyed Ali ShafieiSeyed Ahmad Shafiei
Apr 28, 2011·Medical Physics·Dietmar GeorgBrendan McClean
Nov 6, 2010·Medical & Biological Engineering & Computing·Andrea FidanzioAngelo Piermattei
Feb 4, 2014·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·Mohamad J Tahmasebi BirganiNima Hamzian
Nov 7, 2007·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Carolyn McKerracher, David I Thwaites
Oct 29, 2004·Physics in Medicine and Biology·Darío Esteban Sanz, Flavio Enrico Nelli
Jan 1, 2000·Physics in Medicine and Biology·B M McCurdy, S Pistorius
Oct 4, 2002·Physics in Medicine and Biology·Darío Esteban Sanz
May 8, 1999·Physics in Medicine and Biology·Y XiaoJ Reiff

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