Measured and Monte Carlo calculated kQ factors: Accuracy and comparison

Medical Physics

Volumn 38, Issue 8, 2011, Pages 4600-4609

  Muir, B R ^a   McEwen, M R ^b   Rogers, D W O ^a  

^a CARLETON UNIVERSITY   (Canada)

^b NATIONAL RESEARCH COUNCIL CANADA   (Canada)

Author keywords

dosimetry protocols; EGSnrc; measurements; Monte Carlo; W e

Indexed keywords

CALIBRATION; IONIZATION CHAMBERS; MEASUREMENT; MEDICAL PHYSICS; RELIABILITY ANALYSIS; UNCERTAINTY ANALYSIS;

CALIBRATION COEFFICIENTS; COMBINED UNCERTAINTY; CONSISTENCY CHECKS; CONVERSION FACTOR; EGSNRC; MONTE CARLO CALCULATION; SELF-CONSISTENCY; WATER CALIBRATION;

MONTE CARLO METHODS;

EID: 79961069191     PISSN: 00942405     EISSN: None     Source Type: Journal    
DOI: 10.1118/1.3600697     Document Type: Article

References (37)

1. Q factors in megavoltage photon beams., Med. Phys. 37, 2179-2193 (2010). 10.1118/1.3375895
2. Q, the beam quality conversion factor., Med. Phys. 37, 5939-5950 (2010). 10.1118/1.3495537
3. Q for the NE2571 chamber in a 5 MV and 10 MV photon beam., Phys. Med. Biol. 44, 647-663 (1999). 10.1088/0031-9155/44/3/002 (Pubitemid 29133059)
4. J. P. Seuntjens, C. K. Ross, K. R. Shortt, and D. W. O. Rogers, Absorbed-dose beam quality conversion factors for cylindrical chambers in high-energy photon beams., Med. Phys. 27, 2763-2779 (2000). 10.1118/1.1328081 (Pubitemid 32063456)
5. Q beam quality correction factors for the NE 2611A chamber in high energy photon beams using the Nederlands Meetinstituut water calorimeter., IAEA-CN-96/17P in Vol. 1, Proceedings of International Symposium on Standards and Codes of Practice in Medical Radiation Dosimetry, (IAEA, Vienna, 2003), pp. 93-102.
6. Q, for two types of Farmer chamber in a 10 MV photon and a 175 MeV proton beam., Phys. Med. Biol. 51, 1503-1521 (2006). 10.1088/0031-9155/51/6/010 (Pubitemid 43332351)
7. Q factors for NE 2561 and NE 2571 ionization chambers in 5 cm 5 cm and 10 cm 10 cm radiotherapy beams of 8 MV and 16 MV photons., Phys. Med. Biol. 52, 6243-6259 (2007). 10.1088/0031-9155/52/20/011 (Pubitemid 350093192)
8. A. H. L. Aalbers, M. T. Hoornaert, A. Minken, H. Palmans, M. W. H. Pieksma, L. A. de Prez, N. Reynaert, S. Vynckier, and F. W. Wittkamper, Code of practice for the absorbed dose determination in high energy photon and electron beams., NCS Report 18 of the Netherlands Commission on Radiation Dosimetry (2008).
9. K. R. Shortt, C. K. Ross, M. Schneider, K. Hohlfeld, M. Roos, and A.-M. Perroche, A comparison of absorbed dose standards for high energy X-rays., Phys. Med. Biol. 38, 1937-1955 (1993). 10.1088/0031-9155/38/12/016 (Pubitemid 24026137)
10. M. Boutillon, B. M. Coursey, K. Hohlfeld, B. Owen, and D. W. O. Rogers, Comparison of primary water absorbed dose standards., Proceeedings of Symposium on Measurement Assurance in Dosimetry, IAEA-SM-330/48 (IAEA, Vienna, 1994), pp. 95-111.
11. 10 as a beam quality specifier for high-energy photon beams., Proceedings of the Symposium on Measurement Assurance in Dosimetry, IAEA-SM-330/10 (IAEA, Vienna, 1994), pp. 309-321.
12. Q, for ionization chambers used in photon and electron dosimetry., Phys. Med. Biol. 40, 1177-1190 (1995). 10.1088/0031-9155/40/7/003
13. Q, for cylindrical ionization chambers., Technical Report CLRP 10-02, http://www.physics.carleton.ca/clrp/kQ.
14. J. Wulff, K. Zink, and I. Kawrakow, Efficiency improvements for ion chamber calculations in high energy photon beams., Med. Phys. 35, 1328-1336 (2008). 10.1118/1.2874554 (Pubitemid 351457500)
15. I. Kawrakow and D. W. O. Rogers, The EGSnrc Code System: Monte Carlo simulation of electron and photon transport., Technical Report PIRS-701 (National Research Council of Canada, Ottawa, Canada, 2007).
16. I. Kawrakow, Accurate condensed history Monte Carlo simulation of electron transport. I. EGSnrc, the new EGS4 version., Med. Phys. 27, 485-498 (2000). 10.1118/1.598917 (Pubitemid 30171797)
17. J. Wulff, J. T. Heverhagen, and K. Zink, Monte-Carlo-based perturbation and beam quality correction factors for thimble ionization chambers in high-energy photon beams., Phys. Med. Biol. 53, 2823-2836 (2008). 10.1088/0031-9155/53/11/005 (Pubitemid 351868608)
18. D. M. Gonzlez-Castao, G. H. Hartmann, F. Snchez-Doblado, F. Gmez, R.-P. Kapsch, J. Pena, and R. Capote, The determination of beam quality correction factors: Monte Carlo simulations and measurements., Phys. Med. Biol. 54, 4723-4741 (2009). 10.1088/0031-9155/54/15/006
19. 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). 10.1118/1.598691 (Pubitemid 29442268)
20. 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).
21. J. F. Boas, R. B. Huntley, and D. V. Webb, The relative response of NE2561 and NE2611A ionization chambers in megavoltage X-ray beams., Phys. Med. Biol. 46, 3259-3267 (2001). 10.1088/0031-9155/46/12/313 (Pubitemid 34568071)
22. D. Webb, D. Butler, and C. Oliver, Recent activities in measurement standards and dosimetry at ARPANSA, 2003-2005., BIPM document CCRI(1)/05-02 (BIPM, Svres, France, 2005).
23. Q, for ionisation chambers of type NE 2561 and NE 2611., 11th Radiotherapy Standards Users' Group meeting NPL, (Teddington, UK, 2008).
24. D. Sheikh-Bagheri and D. W. O. Rogers, Monte Carlo calculation of nine megavoltage photon beam spectra using the BEAM code., Med. Phys. 29, 391-402 (2002). 10.1118/1.1445413 (Pubitemid 34241162)
25. 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). 10.1118/1.2011090 (Pubitemid 41384089)
26. L. Tantot and J. P. Seuntjens, Modeling ionization chamber response to nonstandard beam configurations., J. Phys.: Conf. Ser. 102, 012023 (2008). 10.1088/1742-6596/102/1/012023
27. C. K. Ross and K. R. Shortt, The effect of waterproofing sleeves on ionization chamber response., Phys. Med. Biol. 37, 1403-1411 (1992). 10.1088/0031-9155/37/6/017
28. wall, for thimble ionization chambers., Med. Phys. 33, 455-464 (2006). 10.1118/1.2161403 (Pubitemid 43183990)
29. Q factors, ion recombination, polarity and sleeve effects of Farmer type chambers calibrated in terms of absorbed dose to water at NPL., 11th Radiotherapy Standards Users' Group meeting, (NPL, Teddington, UK, 2008).
30. L. L. W. Wang and D. W. O. Rogers, Calculation of the replacement correction factors for ion chambers in megavoltage beams by Monte Carlo simulation., Med. Phys. 35, 1747-1755 (2008). 10.1118/1.2898139 (Pubitemid 351614788)
31. D. J. La Russa, M. McEwen, and D. W. O. Rogers, An experimental and computational investigation of the standard temperature-pressure correction factor for ion chambers in kilovoltage x rays., Med. Phys. 34, 4690-4699 (2007). 10.1118/1.2799580 (Pubitemid 350197707)
32. 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). 10.1016/0029-554X(75)90496-6
33. S. Brandt, Data Analysis: Statistical and Computational Methods for Scientists and Engineers, 3rd ed. (Springer-Verlag, New York, 1999).
34. 60Co therapy source., Med. Phys. 26, 2494-2502 (1999). 10.1118/1.598770
35. R. Mohan, C. Chui, and L. Lidofsky, Energy and angular distributions of photons from medical linear accelerators., Med. Phys. 12, 592-597 (1985). 10.1118/1.595680 (Pubitemid 15248414)
36. M. R. McEwen and C. K. Ross, Direct calibration of ionization chambers in linac photon beams., Med. Phys. 32, 2128 (2005). 10.1118/1.1998523
37. B. R. Muir and D. W. O. Rogers, The central electrode correction factor for high-Z electrodes in small ionization chambers., Med. Phys. 38, 1081-1088 (2011). 10.1118/1.3532818