Functional forms for photon spectra of clinical linacs

Physics in Medicine and Biology

Volumn 57, Issue 1, 2012, Pages 31-50

  Ali, E S M ^a   Rogers, D W O ^a  

^a CARLETON UNIVERSITY   (Canada)

Author keywords

[No Author keywords available]

Indexed keywords

AVERAGE ENERGY; CYBERKNIFE; DEPTH DOSE; ENERGY FLUENCES; ENERGY SPREADS; FLATTENING FILTERS; FREE PARAMETERS; FUNCTIONAL FORMS; HIGH-PRECISION; IMAGING MODES; INCIDENT ELECTRON BEAMS; INCIDENT ELECTRONS; MONTE CARLO; OFF-AXIS; PHOTON ENERGY; PHOTON SPECTRA; PHYSICS-BASED; ROOT-MEAN SQUARE DEVIATION; SIEMENS; TOMOTHERAPY; TRANSMISSION DATA; VIRTUAL SOURCES;

APPROXIMATION THEORY; DOSIMETERS; DOSIMETRY; ELECTRON BEAMS; KINETIC ENERGY; PHOTONS;

LINEAR ACCELERATORS;

ARTICLE; MONTE CARLO METHOD; PHOTON; QUALITY CONTROL; RADIOMETRY; REPRODUCIBILITY; SPECTROSCOPY;

BENCHMARKING; MONTE CARLO METHOD; PHOTONS; RADIOMETRY; REPRODUCIBILITY OF RESULTS; SPECTRUM ANALYSIS;

EID: 83455225172     PISSN: 00319155     EISSN: 13616560     Source Type: Journal    
DOI: 10.1088/0031-9155/57/1/31     Document Type: Article

References (48)

1. Ahnesj A and Andreo P 1989 Determination of effective bremsstrahlung spectra and electron contamination for photon dose calculations Phys. Med. Biol. 34 1451-64 (Pubitemid 19245994)
2. Ali E S M, McEwen M R and Rogers D W O 2011 Beyond self-consistency in beam commissioning: determination of true linac spectra Med. Phys. 38 3870-1 (abstract)
3. Ali E S M and Rogers D W O 2011a A novel physics-based approach for unfolding megavoltage bremsstrahlung spectra using transmission analysis Med. Phys. submitted
4. Ali E S M and Rogers D W O 2011b Validation of a new spectral functional form Technical Report CLRP 11-01 (Ottawa: Carleton Laboratory for Radiotherapy Physics, Carleton University) http://www.physics.carleton.ca/clrp/brem-spectra
5. Araki F 2006 Monte Carlo study of a Cyberknife stereotactic radiosurgery system Med. Phys. 33 2955-63 (Pubitemid 44154569)
6. Baker C R 1993 Reconstruction of clinical bremsstrahlung spectra in the range 4 to 30 MeV PhD Thesis University of Surrey
7. Baker C R, Ama'ee B and Spyrou N M 1995 Reconstruction of megavoltage photon spectra by attenuation analysis Phys. Med. Biol. 40 529-42
8. Baker C R and Peck K K 1997 Reconstruction of 6 MV photon spectra from measured transmission including maximum energy estimation Phys. Med. Biol. 42 2041-51 (Pubitemid 27512527)
9. Bloch P and McDonough J 1998 Extraction of the photon spectra from measured beam parameters Med. Phys. 25 752-7 (Pubitemid 28234898)
10. Briesmeister J F 1999 MCNP - a general Monte Carlo N-particle transport code, version 4c3 Los Alamos National Laboratory Report LA-12625 (Los Alamos, NM: Los Alamos National Laboratory)
11. Charland P M, Chetty I J, Paniak L D, Bednarz B P and Fraass B A 2004 Enhanced spectral discrimination through the exploitation of interface effects in photon dose data Med. Phys. 31 264-76 (Pubitemid 38235396)
12. Cho S H, Vassiliev O N, Lee S, Liu H H, Ibbott G S and Mohan R 2005 Reference photon dosimetry data and reference phase space data for the 6 MV photon beam from Varian Clinac 2100 series linear accelerators Med. Phys. 32 137-48 (Pubitemid 40165525)
13. Dance W E and Baggerly L L 1965 Investigations of electron interactions with matter: part 1. Bremsstrahlung production in aluminum and iron NASA Report CR-334
14. Davidson S, Cui J, Followill D, Ibbott G and Deasy J 2008 A flexible Monte Carlo tool for patient or phantom specific calculations: comparison with preliminary validation measurements J. Phys. Conf. Ser. 102 012004
15. Desobry G E and Boyer A L 1991 Bremsstrahlung review: an analysis of the Schiff spectrum Med. Phys. 18 497-505
16. Faddegon B A, Asai M, Perl J, Ross C, Sempau J, Tinslay J and Salvat F 2008 Benchmarking of Monte Carlo simulation of bremsstrahlung from thick targets at radiotherapy energies Med. Phys. 35 4308-17
17. Faddegon B A, Ross C K and Rogers D W O 1990 Forward-directed bremsstrahlung of 10 to 30 MeV electrons incident on thick targets of Al and Pb Med. Phys. 17 773-85 (Pubitemid 20353754)
18. Faddegon B A, Ross C K and Rogers D W O 1991 Angular distribution of bremsstrahlung from 15 MeV electrons incident on thick targets of Be, Al and Pb Med. Phys. 18 727-39
19. Findlay D J S 1989 Analytic representation of bremsstrahlung spectra from thick radiators as a function of photon energy and angle Nucl. Instrum. Methods A 276 598-601
20. Fippel M 1999 Fast Monte Carlo dose calculation for photon beams based on the VMC electron algorithm Med. Phys. 26 1466-75 (Pubitemid 29402256)
21. Fippel M, Haryanto F, Dohm O, Nsslin F and Kriesen S 2003 A virtual photon energy fluence model for Monte Carlo dose calculation Med. Phys. 30 301-11 (Pubitemid 36337095)
22. Garnica-Garza H M 2008 Determination of radiotherapy x-ray spectra using a screen-film system Med. Biol. Eng. Comput. 46 1029-37
23. Georg D, Kns T and McClean B 2011 Current status and future perspective of flattening filter free photon beams Med. Phys. 38 1280-93
24. Harrison R M, Lambert G D and Chapple C L 1993 Spectral estimation and contrast calculation in the design of contrast-detail test objects for radiotherapy portal imaging Phys. Med. Biol. 38 545-56 (Pubitemid 23107382)
25. Hinson W H and Bourland J D 2002 Spectral reconstruction of high energy photon beams for kernel based dose calculations Med. Phys. 29 1789-96 (Pubitemid 35364215)
26. Jeraj R, Mackie T R, Balog J, Olivera G, Pearson D, Kapatoes J, Ruchala K and Reckwerdt P 2004 Radiation characteristics of helical tomotherapy Med. Phys. 31 396-404 (Pubitemid 38235410)
27. Kawrakow I 2000 Accurate condensed history Monte Carlo simulation of electron transport: I. EGSnrc, the new EGS4 version Med. Phys. 27 485-98 (Pubitemid 30171797)
28. Kawrakow I and Rogers D W O 2007 The EGSnrc Code System: Monte Carlo simulation of electron and photon transport NRC Technical Report PIRS-701 v4-2-2-5 (Ottawa: National Research Council of Canada), http://www.irs.inms.nrc. ca/inms/irs/EGSnrc/EGSnrc.html
29. Koch H W and Motz J W 1959 Bremsstrahlung cross-section formulas and related data Rev. Mod. Phys. 31 920-55
30. Kramers H A 1923 On the theory of x-ray absorption and of the continuous x-ray spectrum Phil. Mag. 46 836-71
31. Krmar M, Slivka J, Bikit I, Vesković M and onkić L 1996 Evaluation of bremsstrahlung spectra generated by a 4 MeV linear accelerator Med. Phys. 23 651-4 (Pubitemid 26000111)
32. Krmar M, Slivka J, Bikit I, Vesković M, onkić L, Bistrović M and Rudić A 1993 A new method for the measurement of bremsstrahlung spectra Phys. Med. Biol. 38 533-44 (Pubitemid 23107381)
33. LaRiviere P D 1989 The quality of high-energy X-ray beams Br. J. Radiol. 62 473-81
34. Matthews J L and Owens R O 1973 Accurate formulae for the calculation of high energy electron bremsstrahlung spectra Nucl. Instrum. Methods 111 157-68
35. Nelson W R, Hirayama H and Rogers D W O 1985 The EGS4 code system Report SLAC-265 (Stanford, CA: Stanford Linear Accelerator Center)
36. Nordell B and Brahme A 1984 Angular distribution and yield from bremsstrahlung targets Phys. Med. Biol. 29 797-810 (Pubitemid 14053947)
37. Partridge M 2000 Reconstruction of megavoltage photon spectra from electronic portal imager derived transmission measurements Phys. Med. Biol. 45 N115-31
38. Press W H, Teukolsky S A, Vetterling W T and Flannery B P 1992 Numerical Recipes in Fortran 2nd edn (New York: Cambridge University Press)
39. Rogers D W O 1975 Analytic and graphical methods for assigning errors to parameters in nonlinear least-squares fitting Nucl. Instrum Methods 127 253-60
40. Sawchuk S 2001 Monte Carlo estimate to improve photon energy spectrum reconstruction Advanced Monte Carlo for Radiation Physics, Particle Transport Simulation and Applications: Proc. Monte Carlo 2000 Conf. (Lisbon) ed A Kling, F Baro, M Nakagawa and L Tvora (Berlin: Springer) pp 383-8
41. Sawkey D L and Faddegon B A 2009 Determination of electron energy, spectral width, and beam divergence at the exit window for clinical megavoltage x-ray beams Med. Phys. 36 698-707
42. Schiff L I 1951 Energy-angle distribution of thin target bremsstrahlung Phys. Rev. 83 252-3
43. Sheikh-Bagheri D and Rogers D W O 2002a Monte Carlo calculation of nine megavoltage photon beam spectra using the BEAM code Med. Phys. 29 391-402 (Pubitemid 34241162)
44. Sheikh-Bagheri D and Rogers D W O 2002b Sensitivity of megavoltage photon beam Monte Carlo simulations to electron beam and other parameters Med. Phys. 29 379-90 (Pubitemid 34241161)
45. Sikora M, Dohm O and Alber M 2007 A virtual photon source model of an Elekta linear accelerator with integrated mini MLC for Monte Carlo based IMRT dose calculation Phys. Med. Biol. 52 4449-63 (Pubitemid 47103135)
46. Tarasko M Z, Soldatov A S and Rudnikov V E 1988 Description of bremsstrahlung spectra from a thick target for 4-12 MeV electrons At. Energ. 65 290-1
47. Tonkopi E, McEwen M, Walters B and Kawrakow I 2005 Influence of ion chamber response on in-air profile measurements in megavoltage photon beams Med. Phys. 32 2918-27 (Pubitemid 41384089)
48. Walters B R B and Rogers D W O 2000 Monte Carlo estimates of %dd(10) for the NPL photon beams NRC Report PIRS 659 http://www.physics.carleton.ca/ ̃drogers/pubs/papers/WR00.pdf