An experimental and computational investigation of the standard temperature-pressure correction factor for ion chambers in kilovoltage x rays

Medical Physics

Volumn 34, Issue 12, 2007, Pages 4690-4699

  La Russa, Daniel J ^a   McEwen, Malcolm ^b   Rogers, D W O ^a  

^a CARLETON UNIVERSITY   (Canada)

^b NATIONAL RESEARCH COUNCIL CANADA   (Canada)

Author keywords

Air pressure; Correction factors; EGSnrc; Ion chamber dosimetry; Monte Carlo; Temperature pressure correction; X ray

Indexed keywords

ATMOSPHERIC TEMPERATURE; IONIZATION CHAMBERS; IONS; X RAYS;

AIR PRESSURES; CALIBRATION COEFFICIENTS; COMPUTATIONAL INVESTIGATION; CORRECTION FACTORS; EGSNRC; PRESSURE CORRECTION; REFERENCE CONDITION; TEMPERATURE AND PRESSURES;

MONTE CARLO METHODS;

ACCURACY; AIR; ARTICLE; CALIBRATION; EXPERIMENTAL STUDY; IONIZATION CHAMBER; LOW ENERGY RADIATION; MONTE CARLO METHOD; PRIORITY JOURNAL; RADIATION BEAM; RADIATION ENERGY; SENSITIVITY ANALYSIS; TEMPERATURE; X RAY;

EID: 36649023682     PISSN: 00942405     EISSN: None     Source Type: Journal    
DOI: 10.1118/1.2799580     Document Type: Article

References (34)

1. S. L. Griffin, L. A. DeWerd, J. A. Micka, and T. D. Bohm, " The effect of ambient pressure on well chamber response: Experimental results with empirical correction factors., " Med. Phys. 0094-2405 10.1118/1.1861157 32, 700-709 (2005).
2. T. D. Bohm, S. L. Griffin, J. P. M. DeLuca, and L. A. DeWerd, " The effect of ambient pressure on well chamber response: Monte Carlo calculated results for the HDR 1000 Plus., " Med. Phys. 0094-2405 10.1118/1.1884905 32, 1103-1114 (2005).
3. D. J. La Russa and D. W. O. Rogers, " An EGSnrc investigation of the PTP correction factor for ion chambers in kilovoltage x-rays., " Med. Phys. 0094-2405 10.1118/1.2392407 33, 4590-4599 (2006).
4. W. Will and A. Rakow, " Measuring of the standard ionic dose in compact and liquid media during x-ray and gamma irradiation by energies between 50 keV and 3 MeV., " Strahlentherapie 141, 166-175 (1971) W. Will and A. Rakow, " [English translation in Rad. Sci. Trans. 8 (1973)].
5. W. Will and A. Rakow, " Measuring of the standard ionic dose in compact and liquid media during x-ray and gamma irradiation by energies between 50 keV and 3 MeV., " Strahlentherapie 141, 166-175 (1971) W. Will and A. Rakow, " [English translation in Rad. Sci. Trans. 8 (1973)].
6. J. E. Burns and D. H. Pritchard, Technical Report Rad. Sci. 40, National Physical Laboratory, Teddington, U.K., 1977.
7. F. H. Attix, Introduction to Radiological Physics and Radiation Dosimetry (Wiley, New York, 1986).
8. A. E. Nahum, W. H. Henry, and C. K. Ross, " Response of carbon and aluminium walled thimble chamber in C 60 o and 20 MeV electron beams," in Proceedings of VII International Conference on Medical Physics., Med. Biol. Eng. Comput. 23, 612-613 (1985).
9. L. A. Buckley, I. Kawrakow, and D. W. O. Rogers, " An EGSnrc investigation of cavity theory for ion chambers measuring air kerma., " Med. Phys. 0094-2405 10.1118/1.1573891 30, 1211-1218 (2003).
10. J. P. McCaffrey, B. Downton, H. Shen, D. Niven, and M. McEwen, " Pre-irradiation effects on ionization chambers used in radiation therapy., " Phys. Med. Biol. 0031-9155 10.1088/0031-9155/50/13/N01 50, N121-N133 (2005).
11. 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. 0094-2405 10.1118/1.597552 22, 503-524 (1995).
12. E. Mainegra-Hing and I. Kawrakow, " Efficient x-ray tube simulations., " Med. Phys. 0094-2405 10.1118/1.2219331 33, 2683-2690 (2006).
13. E. S. M. Ali and D. W. O. Rogers, " Efficiency improvements of x-ray simulations in EGSnrc user-codes using Bremsstrahlung Cross Section Enhancement (BCSE)., " Med. Phys. 0094-2405 10.1118/1.2736778 34, 2143-2154 (2007).
14. K. Cranley, B. J. Gilmore, G. W. Fogarty, and L. Desponds, Catalogue of diagnostic x-ray spectra and other data, CD edition 1997, electronic version prepared by D. Sutton, Technical Report 78, The Institute of Physics and Engineering in Medicine (IPEM), York, 1997.
15. R. Birch and M. Marshall, " Computation of Bremsstrahlung x-ray spectra and comparison with spectra measured with a Ge(Li) detector., " Phys. Med. Biol. 0031-9155 10.1088/0031-9155/24/3/002 24, 505-517 (1979).
16. F. Verhaegen, A. E. Nahum, S. Van de Putte, and Y. Namito, " Monte Carlo modelling of radiotherapy kV x-ray units., " Phys. Med. Biol. 0031-9155 10.1088/0031-9155/44/7/315 44, 1767-1789 (1999).
17. M. R. Ay, M. Shahriari, S. Sarkar, M. Adib, and H. Zaidi, " Monte Carlo simulation of x-ray spectra in diagnostic radiology and mammography using MCNP4C., " Phys. Med. Biol. 0031-9155 10.1088/0031-9155/49/21/004 49, 4897-4917 (2004).
18. G. Ullman, M. Sandborg, D. R. Dance, M. Yaffe, and G. A. Carlsson, " A search for optimal x-ray spectra in iodine contrast media mammography., " Phys. Med. Biol. 0031-9155 10.1088/0031-9155/50/13/012 50, 3143-3152 (2005).
19. ISO, Guide to the Expression of Uncertainties in Measurement (International Organisation for Standardization, Geneva, Switzerland, 1993).
20. R. E. Bentley, Uncertainty in Measurement: The ISO Guide (National Measurement Laboratory CSIRO, Australia, 2003).
21. I. Kawrakow, " Accurate condensed history Monte Carlo simulation of electron transport. I. EGSnrc, the new EGS4 version., " Med. Phys. 0094-2405 10.1118/1.598917 27, 485-498 (2000).
22. 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 (2000); See http://www.irs.inms.nrc. ca/inms/irs/EGSnrc/EGSnrc.html
23. 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 (2000); See http://www.irs.inms.nrc. ca/inms/irs/EGSnrc/EGSnrc.html
24. I. Kawrakow, E. Mainegra-Hing, and D. W. O. Rogers, EGSnrcMP: The multi-platform environment for EGSnrc, Technical Report PIRS-877, National Research Council of Canada, Ottawa, Canada, 2003.
25. I. Kawrakow, egspp: The EGSnrc C++ class library, Technical Report PIRS-899, National Research Council of Canada, Ottawa, Canada, 2005.
26. M. J. Rivard, B. M. Coursey, L. A. DeWerd, M. S. Huq, G. S. Ibbott, M. G. Mitch, R. Nath, and J. F. Williamson, " Update of AAPM Task Group No.43 Report: A revised AAPM protocol for brachytherapy dose calculations., " Med. Phys. 0094-2405 10.1118/1.1646040 31, 633-674 (2004).
27. J. P. Seuntjens, I. Kawrakow, J. Borg, F. Hobeila, and D. W. O. Rogers, in Recent Developments in Accurate Rradiation Dosimetry, Proceedings of an International Workshop, edited by, J. P. Seuntjens, and, P. Mobit, (Medical Physics, Madison, WI, 2002), pp. 69-84.
28. D. W. O. Rogers, I. Kawrakow, J. P. Seuntjens, and B. R. B. Walters, NRC User Codes for EGSnrc, Technical Report PIRS-702, National Research Council of Canada, Ottawa, Canada (2000); See http://www.irs.inms.nrc.ca/inms/irs/EGSnrc/ EGSnrc.html
29. D. W. O. Rogers, I. Kawrakow, J. P. Seuntjens, and B. R. B. Walters, NRC User Codes for EGSnrc, Technical Report PIRS-702, National Research Council of Canada, Ottawa, Canada (2000); See http://www.irs.inms.nrc.ca/inms/irs/EGSnrc/ EGSnrc.html
30. C. -M. Ma and A. E. Nahum, " Bragg-Gray theory and ion chamber dosimetry for photon beams., " Phys. Med. Biol. 0031-9155 10.1088/0031-9155/36/4/001 36, 413-428 (1991).
31. J. Borg, I. Kawrakow, D. W. O. Rogers, and J. P. Seuntjens, " Monte Carlo study of correction factors for Spencer-Attix cavity theory at photon energies at or above 100 keV., " Med. Phys. 0094-2405 10.1118/1.1287054 27, 1804-1813 (2000).
32. D. V. Cormack and H. E. Johns, " The measurement of high-energy radiation intensity., " Radiat. Res. 0033-7587 10.2307/3570293 1, 133-157 (1954).
33. G. N. Whyte, " Measurement of the Bragg-Gray stopping power correction., " Radiat. Res. 0033-7587 10.2307/3570618 6, 371-379 (1957).
34. F. H. Attix, L DeLa Vergne, and V. H. Ritz, " Cavity ionization as a function of wall material., " J. Res. Natl. Bur. Stand. 60, 235-243 (1958).