On the effective point of measurement in megavoltage photon beams

Medical Physics

Volumn 33, Issue 6, 2006, Pages 1829-1839

  Kawrakow, Iwan ^a  

^a NATIONAL RESEARCH COUNCIL CANADA   (Canada)

Author keywords

[No Author keywords available]

Indexed keywords

DOSIMETRY; MONTE CARLO METHODS; PARTICLE BEAMS; PHOTOELECTRONS; PHOTONS;

BUILD-UP REGION; CHAMBER DESIGN; MASS DENSITIES; MEASURED DEPTHS; MEGAVOLTAGE PHOTONS; NUMERICAL INVESTIGATIONS; POINT OF MEASUREMENT; WALL MATERIALS;

PHOTOIONIZATION;

ACCURACY; ARTICLE; DENSITY; DOSIMETRY; EFFECTIVE POINT OF MEASUREMENT; ELECTRODE; IONIZATION CHAMBER; MASS; MATERIALS; MEASUREMENT; MEGAVOLTAGE RADIATION; MONTE CARLO METHOD; PHOTON THERAPY; PREDICTION; PRIORITY JOURNAL; RADIATION DOSE;

EID: 33744828302     PISSN: 00942405     EISSN: None     Source Type: Journal    
DOI: 10.1118/1.2201147     Document Type: Article

References (29)

1. C. L. Hartmann Siantar, " Description and dosimetric verification of the PEREGRINE Monte Carlo dose calculation system for photon beams incident on a water phantom., " Med. Phys. 28, 1322-1337 (2001).
2. G. X. Ding, " Energy spectra, angular spread, fluence profiles and dose distributions of 6 and 18 MV photon beams: results of Monte Carlo simulations for a Varian 2100EX accelerator., " Phys. Med. Biol. 47, 1025-1046 (2002).
3. W. Abdel-Rahman, J. P. Seuntjens, F. Verhaegen, F. Deblois, and E. B. Podgorsak, " Validation of Monte Carlo calculated surface doses for megavoltage photon beams., " Med. Phys. 32, 286-298 (2005).
4. D. W. O. Rogers, B. A. Faddegon, G. X. Ding, C.-M. Ma, J. Wei, and T. R. Mackie, " BEAM: A Monte Carlo code to simulate radiotherapy treatment units., " Med. Phys. 22, 503-524 (1995).
5. D. W. O. Rogers, B. Walters, and I. Kawrakow, BEAMnrc Users Manual, NRC Report PIRS 509(a)revH (2004).
6. G. X. Ding, " Dose discrepancies between Monte Carlo calculations and measurements in the builup region for a high-energy photon beam., " Med. Phys. 29, 2459-2463 (2002).
7. I. Kawrakow, " Accurate condensed history Monte Carlo simulation of electron transport. I. EGSnrc the new EGS4 version., " Med. Phys. 27, 485-498 (2000).
8. I. Kawrakow and D. W. O. Rogers, "The EGSnrc Code System: Monte Carlo simulation of electron and photon transport," Technical Report PIRS-701 (4th printing) (National Research Council of Canada, Ottawa, Canada, 2003).
9. O. Chibani and C.-M. C. Ma, " Photonuclear dose calculations for high-energy photon beams from Siemens and Varian linacs., " Med. Phys. 32, 1990-2000 (2003).
10. I. Gudowska, A. Brahme, P. Andreo, W. Gudowski, and J. Kierkegaard, " Calculation of absorbed dose and biological effectiveness from photonuclear reactions in a bremsstrahlung beam of end point 50 MeV., " Phys. Med. Biol. 44, 2099-2125 (1999).
11. K. Mork and H. Olsen, " Radiative corrections: I. High-energy bremsstrahlung and pair production., " Phys. Rev. 140, B1661-B1674 (1965).
12. K. Mork, " Radiative corrections. II. Compton effect., " Phys. Rev. A 4, 917-927 (1971).
13. P. R. Almond, P. J. Biggs, B. M. Coursey, W. F. Hanson, M. S. Huq, R. Nath, and D. W. O. Rogers, " AAPM's TG-51 Protocol for Clinical Reference Dosimetry of High-Energy Photon and Electron Beams., " Med. Phys. 26, 1847-1870 (1999).
14. IAEA, " Absorbed dose determination in external beam radiotherapy: an international code of practice for dosimetry based on standards of absorbed dose to water., " Vol. 398 of Technical Report Series (IAEA, Vienna, 2001).
15. P. Andreo, " The status of high-energy photon and electron beam dosimetry five years after the implementation of the IAEA code of practice in the Nordic countries., " Acta Oncol. 32, 483-500 (1993).
16. K. A. Johansson, L. O. Mattsson, L. Lindborg, and H. Svensson, " Absorbed-dose determination with ionization chambers in electron and photon beams having energies between 1 and 50 MeV., " IAEA Symposium Proceedings, Vienna, IAEA-SM-222/35 (1977), pp. 243-270.
17. A. Dutreix, " Problems of high-energy X-ray dosimetry., " in High-Energy Photons and Electrons: Clinical Applications in Cancer Management, edited by, S. Kramer,,, N. Suntharalingam,, and, G. F. Zinninger, (Wiley, New York, 1976), pp. 204-214.
18. H. Svensson and A. Brahme, " Recent advances in electron and photon dosimetry., " in Radiation Dosimetry, edited by, C. G. Orton, (Plenum Publishing, New York, 1986), pp. 87-170.
19. A. C. McEwan, " A theoretical study of cavity chamber correction factors for photon beam absorbed dose determination., " Phys. Med. Biol. 25, 39-50 (1980).
20. D. Sheikh-Bagheri, D. W. O. Rogers, C. K. Ross, and J. P. Seuntjens, " Comparison of measured and Monte Carlo calculated dose distributions from the NRC linac., " Med. Phys., 27, 2256-2266 (2000).
21. I. Kawrakow, " Accurate condensed history Monte Carlo simulation of electron transport. II. Application to ion chamber response simulations., " Med. Phys. 27, 499-513 (2000).
22. D. W. O. Rogers, " Analytic and graphical methods for assigning errors to parameters in non-linear least squares fitting., " Nucl. Instrum. Methods 127, 253-260 (1975).
23. E. Tonkopi, M. McEwen, B. Walters, and I. Kawrakow, " Influence of ion chamber response on in-air profile measurements in megavoltage photon beams., " Med. Phys. 32, 2918-2927 (2005).
24. I. Kawrakow, D. W. O. Rogers, and B. Walters, " Large efficiency improvements in BEAMnrc using directional bremsstrahlung splitting., " Med. Phys. 31, 2883-2898 (2004).
25. D. W. O. Rogers, I. Kawrakow, J. P. Seuntjens, B. R. B. Walters, and E. Mainegra-Hing, "NRC user codes for EGSnrc," Technical Report PIRS-702(RevB) (National Research Council of Canada, Ottawa, Canada, 2003).
26. I. Kawrakow and M. Fippel, " Investigation of variance reduction techniques for Monte Carlo photon dose calculation using XVMC., " Phys. Med. Biol. 45, 2163-2184 (2000).
27. U. Fano, " Note on the Bragg-Gray cavity principle for measuring energy dissipation., " Radiat. Res. 1, 237-240 (1954).
28. B. Fraass, K. Doppke, M. Hunt, G. Kutcher, G. Starkschall, R. Stern, and J. van Dyke, " American association of physicists in medicine radiation therapy committee task group 53: Quality assurance for clinical radiotherapy treatment planning., " Med. Phys. 25, 1773-1829 (1998).
29. H. M. Ewen (private communication).