Extraction of depth-dependent perturbation factors for parallel-plate chambers in electron beams using a plastic scintillation detector

Medical Physics

Volumn 37, Issue 8, 2010, Pages 4331-4342

  Lacroix, Frédéric ^a,b   Guillot, Mathieu ^c,d   McEwen, Malcolm ^e   Cojocaru, Claudiu ^e   Gingras, Luc ^c,d   Beddar, A Sam ^f   Beaulieu, Luc ^c,d  

^a CENTRE HOSPITALIER DE L UNIVERSITÉ DE MONTRÉAL   (Canada)

^b UNIVERSITÉ DE MONTRÉAL   (Canada)

^c UNIVERSITÉ LAVAL   (Canada)

^d LAVAL UNIVERSITY   (Canada)

^e NATIONAL RESEARCH COUNCIL CANADA   (Canada)

^f UNIVERSITY OF TEXAS MD ANDERSON CANCER CENTER   (United States)

Author keywords

dosimetry; effective point of measurement; electron beam dosimetry; plastic scintillation detectors

Indexed keywords

DOSIMETRY; ELECTRON BEAMS; EXTRACTION; IONIZATION; IONIZATION CHAMBERS; MONTE CARLO METHODS; NEUTRON DETECTORS; SCINTILLATION;

CLINICAL ELECTRON BEAMS; DEPTH DEPENDENTS; ELECTRON BEAM DOSIMETRY; EXPERIMENTAL EXTRACTION; LOW ENERGY ELECTRON BEAMS; PARALLEL-PLATE CHAMBER; PLASTIC SCINTILLATION DETECTORS; POINT OF MEASUREMENT;

ELECTRONS;

PLASTIC;

ARTICLE; COMPUTER ASSISTED RADIOTHERAPY; EQUIPMENT; INSTRUMENTATION; RADIATION DOSE; RADIATION EXPOSURE; RADIOMETRY; REPRODUCIBILITY; SCINTILLATION COUNTING; SENSITIVITY AND SPECIFICITY;

EQUIPMENT FAILURE ANALYSIS; PLASTICS; RADIOMETRY; RADIOTHERAPY DOSAGE; RADIOTHERAPY, CONFORMAL; REPRODUCIBILITY OF RESULTS; SCINTILLATION COUNTING; SENSITIVITY AND SPECIFICITY;

EID: 78149492363     PISSN: 00942405     EISSN: None     Source Type: Journal    
DOI: 10.1118/1.3463383     Document Type: Article

References (48)

1. P. R. Almond, P. J. Biggs, B. M. Coursey, W. F. Hanson, M. S. Huq, R. Nath, and D. W. Rogers, "AAPM's TG-51 protocol for clinical reference dosimetry of high-energy photon and electron beams," Med. Phys. 26, 1847-1870 (1999).
2. F. Tessier and I. Kawrakow, "Effective point of measurement of thimble ion chambers in megavoltage photon beams," Med. Phys. 37, 96-107 (2010).
3. P. Andreo, D. T. Burns, K. Hohlfeld, M. S. Huq, T. Kanai, F. Laitano, V. G. Smyth, and S. Vynckier, "Absorbed dose determination in external beam radiotherapy: An international code of practice for dosimetry based on standards of absorbed dose to water," IAEA Technical Reports Series No. 398 (International Atomic Energy Agency, Vienna, 2000).
4. NAR, "Procedures of dosimetry with probe-type detectors for photon and electron radiation: Part 2. Ionization chamber dosimetry of high energy photon and electron radiation," NAR Technical Report No. DIN6800-2 (Normenausschuß Radiologie im DIN, 2008).
5. D. I. Thwaites, A. R. DuSautoy, T. Jordan, M. R. McEwen, A. Nisbet, A. E. Nahum, and W. G. Pitchford, "The IPEM code of practice for electron dosimetry for radiotherapy beams of initial energy from 4 to 25 MeV based on an absorbed dose to water calibration," Phys. Med. Biol. 48, 2929-2970 (2003).
6. C. S. Reft and F. T. Kuchnir, "Measured overall perturbation factors at depths greater than dmax for ionization chambers in electron beams," Med. Phys. 26, 208-213 (1999).
7. H. Casson and J. P. Kiley, "Replacement correction factors for electron measurements with a parallel-plate chamber," Med. Phys. 14, 216-217 (1987).
8. C. Cinos, M. Lizuain, and M. Febrian, "Total perturbation correction factor for PTW and NACP plane parallel chambers in electron beams," Radiother. Oncol. 21, 135-140 (1991).
9. C. S. Reft and F. T. Kuchnir, "Experimental determination of the overall perturbation factor for the NACP chamber in electron beams for dmax
10. M. A. Hunt, G. J. Kutcher, and A. Buffa, "Electron backscatter corrections for parallel-plate chambers," Med. Phys. 15, 96-103 (1988).
11. S. C. Klevenhagen, "Implication of electron backscattering for electron dosimetry," Phys. Med. Biol. 36, 1013-1018 (1991).
12. M. McEwen, H. Palmans, and A. Williams, "An empirical method for the determination of wall perturbation factors for parallel-plate chambers in high-energy electron beams," Phys. Med. Biol. 51, 5167-5181 (2006).
13. F. Verhaegen, "Interface perturbation effects in high-energy electron beams," Phys. Med. Biol. 48, 687-705 (2003).
14. J. Sempau, P. Andreo, J. Aldana, J. Mazurier, and F. Salvat, "Electron beam quality correction factors for plane-parallel ionization chambers: Monte Carlo calculations using the PENELOPE system," Phys. Med. Biol. 49, 4427-4444 (2004).
15. F. Verhaegen, R. Zakikhani, A. DuSautoy, H. Palmans, G. Bostock, D. Shipley, and J. Seuntjens, "Perturbation correction factors for the NACP-02 plane-parallel ionization chamber in water in high-energy electron beams," Phys. Med. Biol. 51, 1221-1235 (2006).
16. L. A. Buckley and D. W. O. Rogers, "Wall correction factors, Pwall for parallel-plate ionization chambers," Med. Phys. 33, 1788-1796 (2006).
17. F. Araki, "Monte Carlo calculations of correction factors for plane-parallel ionization chambers in clinical electron dosimetry," Med. Phys. 35, 4033-4040 (2008).
18. E. Chin, H. Palmans, D. Shipley, M. Bailey, and F. Verhaegen, "Analysis of dose perturbation factors of a NACP-02 ionization chamber in clinical electron beams," Phys. Med. Biol. 54, 307-326 (2009).
19. L. L. W. Wang and D. W. O. Rogers, "Study of the effective point of measurement for ion chambers in electron beams by Monte Carlo simulation," Med. Phys. 36, 2034-2042 (2009).
20. K. Zink and J. Wulff, "Positioning of a plane-parallel ionization chamber in clinical electron beams and the impact on perturbation factors," Phys. Med. Biol. 54, 2421-2435 (2009).
21. G. Bruggmoser, R. Saum, and F. Schmid, "Wo befindet sich der effektive Messort einer PTW 34001 Roos Kammer," in Dreilaendertagung fuer Medizinische Physik, edited by R. Mini (HRG, Bern, 2007).
22. M. R. McEwen and A. R. DuSautoy, "Primary standards of absorbed dose for electron beams," Metrologia 46, S59-S79 (2009).
23. C. Richter, J. Pawelke, L. Karsch, and J. Woithe, "Energy dependence of EBT-1 radiochromic film response for photon (10 kVp-15 MVp) and electron beams (6-18 MeV) readout by a flatbed scanner," Med. Phys. 36, 5506-5514 (2009).
24. S.-T. Chiu-Tsao, Y. Ho, R. Shankar, L. Wang, and L. B. Harrison, "Energy dependence of response of new high sensitivity radiochromic films for megavoltage and kilovoltage radiation energies," Med. Phys. 32, 3350-3354 (2005).
25. A. Rink, I. A. Vitkin, and D. A. Jaffray, "Energy dependence (75 kVp to 18 MV) of radiochromic films assessed using a real-time optical dosimeter," Med. Phys. 34, 458-463 (2007).
26. H. Bouchard, F. Lacroix, G. Beaudoin, J.-F. Carrier, and I. Kawrakow, "On the characterization and uncertainty analysis of radiochromic film dosimetry," Med. Phys. 36, 1931-1946 (2009).
27. I. Griessbach, M. Lapp, J. Bohsung, G. Gademann, and D. Harder, "Dosimetric characteristics of a new unshielded silicon diode and its application in clinical photon and electron beams," Med. Phys. 32, 3750-3754 (2005).
28. M. McEwen and C. Ross, "Unexpected doserate dependencies of diodes for beam scanning," Med. Phys. 35, 2920-2920 (2008).
29. A.-M. Frelin, J.-M. Fontbonne, G. Ban, J. Colin, M. Labalme, A. Batalla, A. Isambert, A. Vela, and T. Leroux, "Spectral discrimination of Cerenkov radiation in scintillating dosimeters," Med. Phys. 32, 3000-3006 (2005).
30. F. Lacroix, L. Archambault, L. Gingras, M. Guillot, A. S. Beddar, and L. Beaulieu, "Clinical prototype of a plastic water-equivalent scintillating fiber dosimeter array for QA applications," Med. Phys. 35, 3682-3690 (2008).
31. F. Pönisch, L. Archambault, T. M. Briere, N. Sahoo, R. Mohan, S. Beddar, and M. T. Gillin, "Liquid scintillator for 2D dosimetry for highenergy photon beams," Med. Phys. 36, 1478-1485 (2009).
32. A.-M. Frelin, J.-M. Fontbonne, G. Ban, J. Colin, M. Labalme, A. Batalla, A. Vela, P. Boher, M. Braud, and T. Leroux, "The DosiMap, a new 2D scintillating dosimeter for IMRT quality assurance: Characterization of two Cerenkov discrimination methods," Med. Phys. 35, 1651-1662 (2008).
33. L. Archambault, J. C. Polf, L. Beaulieu, and S. Beddar, "Characterizing the response of miniature scintillation detectors when irradiated with proton beams," Phys. Med. Biol. 53, 1865-1876 (2008).
34. A. S. Beddar, T. R. Mackie, and F. H. Attix, "Water-equivalent plastic scintillation detectors for high-energy beam dosimetry: I. Physical characteristics and theoretical consideration," Phys. Med. Biol. 37, 1883-1900 (1992).
35. A. S. Beddar, T. R. Mackie, and F. H. Attix, "Water-equivalent plastic scintillation detectors for high-energy beam dosimetry: II. Properties and measurements," Phys. Med. Biol. 37, 1901-1913 (1992).
36. "Clinical dosimetry measurements in radiotherapy," Medical Physics Monograph No. 34, edited by D. W. O. Rogers and J. E. Cygler (AAPM, New York, 2009).
37. A. S. Beddar, T. M. Briere, F. A. Mourtada, O. N. Vassiliev, H. H. Liu, and R. Mohan, "Monte Carlo calculations of the absorbed dose and energy dependence of plastic scintillators," Med. Phys. 32, 1265-1269 (2005).
38. Task Group 21, Radiation Therapy Committee of the AAPM, "A protocol for the determination of absorbed dose from high-energy photon and electron beams, Med. Phys. 10, 741-771 (1983).
39. D. T. Burns, G. X. Ding, and D. W. O. Rogers, "R50 as a beam quality specifier for selecting stopping-power ratios and reference depths for electron dosimetry," Med. Phys. 23, 383-388 (1996).
40. C. K. Ross, M. R. McEwen, A. F. McDonald, C. D. Cojocaru, and B. A. Faddegon, "Measurement of multiple scattering of 13 and 20 MeV electrons by thin foils," Med. Phys. 35, 4121-4131 (2008).
41. M. R. McEwen, I. Kawrakow, and C. K. Ross, "The effective point of measurement of ionization chambers and the build-up anomaly in MV x-ray beams," Med. Phys. 35, 950-958 (2008).
42. E. Chin, D. Shipley, M. Bailey, J. Seuntjens, H. Palmans, A. DuSautoy, and F. Verhaegen, "Validation of a Monte Carlo model of a NACP-02 plane-parallel ionization chamber model using electron backscatter experiments," Phys. Med. Biol. 53, N119-N126 (2008).
43. F. Lacroix, A. S. Beddar, M. Guillot, L. Beaulieu, and L. Gingras, "A design methodology using signal-to-noise ratio for plastic scintillation detectors design and performance optimization," Med. Phys. 36, 5214-5220 (2009).
44. F. Lacroix, L. Beaulieu, L. Archambault, and A. S. Beddar, "Simulation of the precision limits of plastic scintillation detectors using optimal component selection," Med. Phys. 37, 412-418 (2010).
45. J. Lambert, Y. Yin, D. R. McKenzie, S. Law, and N. Suchowerska, "Cerenkov-free scintillation dosimetry in external beam radiotherapy with an air core light guide," Phys. Med. Biol. 53, 3071-3080 (2008).
46. J. Lambert, Y. Yin, D. R. McKenzie, S. H. Law, A. Ralston, and N. Suchowerska, "A prototype scintillation dosimeter customized for small and dynamic megavoltage radiation fields," Phys. Med. Biol. 55, 1115-1126 (2010).
47. B. A. Faddegon, D. Sawkey, T. O'Shea, M. McEwen, and C. Ross, "Treatment head disassembly to improve the accuracy of large electron field simulation," Med. Phys. 36, 4577-4591 (2009).
48. M. R. McEwen, A. J. Williams, and A. R. DuSautoy, "Trial calibrations of therapy level electron beam ionisation chambers in terms of absorbed dose to water," NPL Report No. CIRM 20 (National Physical Laboratory, Teddington, United Kingdom, 1998). Available at www.npl.co.uk.