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Verification of monitor unit calculations for non-IMRT clinical radiotherapy: Report of AAPM Task Group 114
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1.
1.G. J. Kutcher et al., “Comprehensive QA for radiation oncology: Report of AAPM Radiation Therapy Committee Task Group 40,” Med. Phys. 21, 581618 (1994).
http://dx.doi.org/10.1118/1.597316
2.
2.L. Duggan, T. Kron, S. Howlett, A. Skov, and P. O’Brien, “An independent check of treatment plan, prescription and dose calculation as a QA procedure,” Radiother. Oncol. 42, 297301 (1997).
http://dx.doi.org/10.1016/S0167-8140(97)01906-3
3.
3.American College of Radiology, “Practice guideline for 3D external beam radiation planning and conformal therapy” (2006).
4.
4.The Royal College of Radiologists, Society and College of Radiographers, Institute of Physics and Engineering in Medicine and National Patient Safety Agency and British Institute of Radiology, Towards Safer Radiotherapy (The Royal College of Radiologists, London, 2008), http://www.rcr.ac.uk.
5.
5.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, 17731829 (1998).
http://dx.doi.org/10.1118/1.598373
6.
6.D. Georg, T. Nyholm, J. Olofsson, F. Kjaer-Kristoffersen, B. Schnekenburger, P. Winkler, H. Nystrom, A. Ahnesjo, and M. Karlsson, “Clinical evaluation of monitor unit software and the application of action levels,” Radiother. Oncol. 85, 306315 (2007).
7.
7.Scottish Ministers for the Ionising Radiation (Medical Exposures) Regulations, Unintended Overexposure of Patient Lisa Norris During Radiotherapy Treatment at the Beatson Oncology Centre, Glasgow in January 2006 (Scottish Executive Publications, Edinburgh, 2006), http://www.scotland.gov.uk/Publications/2006/10/27084909/0.
8.
8.French Nuclear Safety Authority (ASN), “Epinal radiotherapy accident,” ASN Report No. 2006 ENSTR 019 IGAS 2007-015P, 2007.
9.
9.International Atomic Energy Agency, “Investigation of an accidental exposure of radiotherapy patients in Panama” (2001).
10.
10.International Atomic Energy Agency, “Lessons learned from accidental exposures in radiotherapy” (2000).
11.
11.P. Ortiz, J. M. Cosset, O. Holmberg, J. C. Rosenwald, and P. Dunscombe, Preventing Accidental Exposures from New External Beam Radiation Therapy Technologies (International Commission on Radiological Protection Publication 112, Ann. ICRP 39, 2009), http://www.icrp.org/.
12.
12.T. K. Yeung, K. Bortolotto, S. Cosby, M. Hoar, and E. Lederer, “Quality assurance in radiotherapy: Evaluation of errors and incidents recorded over a 10 year period,” Radiother. Oncol. 74, 283291 (2005).
http://dx.doi.org/10.1016/j.radonc.2004.12.003
13.
13.R. Calandrino, G. M. Cattaneo, C. Fiorino, B. Longobardi, P. Mangili, and P. Signorotto, “Detection of systematic errors in external radiotherapy before treatment delivery,” Radiother. Oncol. 45, 271274 (1997).
http://dx.doi.org/10.1016/S0167-8140(97)00095-9
14.
14.P. Andreo, J. Izewska, K. Shortt, and S. Vatnitsky, “Commissioning and Quality assurance of computerized planning systems for radiation treatment of cancer,” IAEA Technical Report Series No. 430 (International Atomic Energy Agency, 2004).
15.
15.I. A. D. Buinvis, R. B. Keus, W. J. M. Lenglet, G. J. Meijer, B. J. Mijnheer, A. A. van ‘t Veld, J. L. M. Venselaar, J. Welleweerd, and E. Woudstra, “Quality assurance of 3-D treatment planning systems for external photon and electron beams,” Report No. 15 (The Netherlands Commission on Radiation Dosimetry, 2006).
16.
16.Abt Associates, Inc., “The Abt study of medical physicist work values for radiation oncology physics services: Round III,” prepared for the American College of Medical Physics and the American Association of Physicists in Medicine (2008).
17.
17.E. E. Klein, R. E. Drzymala, J. A. Purdy, and J. Michalski, “Errors in radiation oncology: A study in pathways and dosimetric impact,” J. Appl. Clin. Med. Phys. 6, 8194 (2005).
http://dx.doi.org/10.1120/jacmp.2025.25355
18.
18.International Commission on Radiation Units, “Prescribing, recording and reporting photon beam therapy,” ICRU Report No. 50, 1993.
19.
19.International Commission on Radiation Units, “Prescribing, recording and reporting photon beam therapy,” ICRU Report No. 62, 1999.
20.
20.N. Papanikolaou, J. J. Battista, A. L. Boyer, C. Kappas, E. E. Klein, T. R. Mackie, M. Sharpe, and J. Van Dyke, “Tissue inhomogeneity corrections for megavoltage photon beams,” Report of Task Group No. 65 of the Radiation Therapy Committee of the American Association of Physicists in Medicine, Report No. 85, 2004.
21.
21.S. J. Frank, K. M. Forster, C. W. Stevens, J. D. Cox, R. Komaki, Z. Liao, S. Tucker, X. Wang, R. E. Steadham, C. Brooks, and G. Starkschall, “Treatment planning for lung cancer: Traditional homogeneous point-dose prescription compared with heterogeneity-corrected dose-volume prescription,” Int. J. Radiat. Oncol., Biol., Phys. 56, 13081318 (2003).
http://dx.doi.org/10.1016/S0360-3016(03)00337-7
22.
22.A. Dutreix, B. E. Bjarngard, A. Bridier, B. Mijnheer, J. E. Shaw, and H. Svensson, ESTRO Booklet No. 3: Monitor Unit Calculation for High Energy Photon Beams (ESTRO, 1997), available from http://www.estro-education.org/publications/Pages/ESTROPhysicsBooklets.aspx.
23.
23.H. E. Johns and J. R. Cunningham, The Physics of Radiology, 4th ed. (Charles C. Thomas, Springfield, 1983).
24.
24.F. M. Khan, The Physics of Radiation Therapy (Lippincott Williams & Wilkins, Baltimore, 2003).
25.
25.B. Mijnheer, A. Brdiier, C. Garibaldi, K. Torzsok, and J. Venselaar, ESTRO Booklet No. 6: Monitor Unit Calculation for High Energy Photon Beams—Practical Examples (ESTRO, 2001), available from http://www.estro-education.org/publications/Pages/ESTROPhysicsBooklets.aspx.
26.
26.S. Benedict, K. Yenice, D. Followill, J. Galvin, W. Hinson, B. Kavanagh, P. Keall, M. Lovelock, S. Meeks, L. Papiez, T. Purdie, R. Sadagopan, M. Schell, B. Salter, D. Schlesinger, A. Shiu, T. Solberg, D. Song, V. Stieber, R. Timmerman, W. Tome, D. Verellen, L. Wang, and F. Yin, “Stereotactic body radiation therapy: The report of AAPM Task Group No. 101,” Med. Phys. 37, 40784101 (2010).
http://dx.doi.org/10.1118/1.3438081
27.
27.International Commission on Radiation Units, “Determination of absorbed dose in a patient irradiated by beams of x or gamma rays in radiotherapy procedures,” ICRU Report No. 24, 1976.
28.
28.J. Van Dyk, R. B. Barnett, J. E. Cygler, and P. C. Shragge, “Commissioning and quality assurance of treatment planning computers,” Int. J. Radiat. Oncol., Biol., Phys. 26, 261273 (1993).
http://dx.doi.org/10.1016/0360-3016(93)90206-B
29.
29.K. W. Leszczynski and P. B. Dunscombe, “Independent corroboration of monitor unit calculations performed by a 3D computerized planning system,” J. Appl. Clin. Med. Phys. 1, 120125 (2000).
http://dx.doi.org/10.1120/1.1314820
30.
30.J. Chan, D. Russell, V. G. Peters, and T. J. Farrell, “Comparison of monitor unit calculations performed with a 3D computerized planning system and independent ‘hand’ calculations: Results of three years clinical experience,” J. Appl. Clin. Med. Phys. 3, 293301 (2002).
http://dx.doi.org/10.1120/1.1506379
31.
31.K. L. Prado, S. M. Kirsner, and R. C. Erice, “Corrections to traditional methods of verifying tangential-breast 3D monitor-unit calculations: Use of an equivalent triangle to estimate effective fields,” J. Appl. Clin. Med. Phys. 4, 5157 (2003).
http://dx.doi.org/10.1120/1.1526702
32.
32.K. M. Ayyangar, C. B. Saw, D. Gearheart, B. Shen, and R. Thompson, “Independent calculations to validate monitor units from ADAC treatment planning system,” Med. Dosim. 28, 7983 (2003).
http://dx.doi.org/10.1016/S0958-3947(02)00237-6
33.
33.I. Kay and P. Dunscombe, “Verifying monitor unit calculations for tangential breast fields,” J. Appl. Clin. Med. Phys. 7, 5057 (2006).
http://dx.doi.org/10.1120/jacmp.v7i2.2177
34.
34.I. Kay and T. Meyer, “Verifying monitor unit calculations for tangential whole breast fields in 3-dimensional planning,” J. Appl. Clin. Med. Phys. 9, 2713 (2008).
http://dx.doi.org/10.1120/jacmp.v9i1.2713
35.
35.I. J. Das, G. X. Ding, and A. Ahnesjo, “Small fields: Nonequilibrium radiation dosimetry,” Med. Phys. 35, 206215 (2008).
http://dx.doi.org/10.1118/1.2815356
36.
36.World Health Organization, Radiotherapy Risk Profile (WHO Press, Geneva, 2008), http://www.who.int/patientsafety/activities/technical/radiotherapy/en/.
37.
37.American Association of Physicists in Medicine, “Monitor unit calculations for external photon and electron beams,” Radiation Therapy Committee Task Group Report No. 71 (unpublished).
38.
38.J. R. Palta, D. K. Yeung, and V. Frouhar, “Dosimetric considerations for a multileaf collimator system,” Med. Phys. 23, 12191224 (1996).
http://dx.doi.org/10.1118/1.597678
39.
39.S. B. Jiang, A. L. Boyer, and C. M. Ma, “Modeling the extrafocal radiation and monitor chamber backscatter for photon beam dose calculation,” Med. Phys. 28, 5566 (2001).
http://dx.doi.org/10.1118/1.1333747
40.
40.M. B. Sharpe, D. A. Jaffray, J. J. Battista, and P. Munro, “Extrafocal radiation: A unified approach to the prediction of beam penumbra and output factors for megavoltage x-ray beams,” Med. Phys. 22, 20652074 (1995).
http://dx.doi.org/10.1118/1.597648
41.
41.H. H. Liu, T. R. Mackie, and E. C. McCullough, “Modeling photon output caused by backscattered radiation into the monitor chamber from collimator jaws using a Monte Carlo technique,” Med. Phys. 27, 737744 (2000).
http://dx.doi.org/10.1118/1.598936
42.
42.M. J. Day and E. G. Aird, “The equivalent-field method for dose determinations in rectangular fields,” Br. J. Radiol., Suppl. 17, 105114 (1983).
43.
43.M. J. Day and E. G. Aird, “The equivalent field method for dose determinations in rectangular fields,” BJR Suppl. 25, 138151 (1996).
44.
44.T. D. Sterling, H. Perry, and L. Katz, “Automation of radiation treatment planning. IV. Derivation of a mathematical expression for the per cent depth dose surface of cobalt 60 beams and visualisation of multiple field dose distributions,” Br. J. Radiol. 37, 544550 (1964).
http://dx.doi.org/10.1259/0007-1285-37-439-544
45.
45.G. Kemikler, “Field size and depth dependence of wedge factor for internal wedge of dual energy linear accelerator,” J. BUON 8, 5559 (2003).
46.
46.D. Georg, J. Olofsson, T. Kunzler, H. Aiginger, and M. Karlsson, “A practical method to calculate head scatter factors in wedged rectangular and irregular MLC shaped beams for external and internal wedges,” Phys. Med. Biol. 49, 46894700 (2004).
http://dx.doi.org/10.1088/0031-9155/49/20/002
47.
47.S. Kim, J. R. Palta, and T. C. Zhu, “A generalized solution for the calculation of in-air output factors in irregular fields,” Med. Phys. 25, 16921701 (1998).
http://dx.doi.org/10.1118/1.598350
48.
48.C. Liu, T. C. Zhu, and J. R. Palta, “Characterizing output for dynamic wedges,” Med. Phys. 23, 12131218 (1996).
http://dx.doi.org/10.1118/1.597677
49.
49.A. F. Cozzi, L. Cozzi, and G. Garavaglia, “Wedge factors: Dependence on depth and field size,” Radiother. Oncol. 39, 3134 (1996).
http://dx.doi.org/10.1016/0167-8140(95)01714-3
50.
50.D. Georg, C. Garibaldi, and A. Dutreix, “Measurements of basic parameters in wedged high-energy photon beams using a mini-phantom,” Phys. Med. Biol. 42, 18211831 (1997).
http://dx.doi.org/10.1088/0031-9155/42/9/012
51.
51.A. Popescu, K. Lai, K. Singer, and M. Phillips, “Wedge factor dependence with depth, field size, and nominal distance—A general computational rule,” Med. Phys. 26, 541549 (1999).
http://dx.doi.org/10.1118/1.598555
52.
52.J. E. O’Connor, “The density scaling theorem applied to lateral electronic equilibrium,” Med. Phys. 11, 678680 (1984).
http://dx.doi.org/10.1118/1.595551
53.
53.J. E. O’Connor, “The variation of scattered x-rays with density in an irradiated body,” Phys. Med. Biol. 1, 352369 (1957).
http://dx.doi.org/10.1088/0031-9155/1/4/305
54.
54.B. E. Bjarngard, “On Fano’s and O’Connor’s theorems,” Radiat. Res. 109, 184189 (1987).
http://dx.doi.org/10.2307/3576945
55.
55.H. F. Batho, “Lung corrections in cobalt 60 beam therapy,” J. Can. Assoc. Radiol. 15, 7983 (1964).
56.
56.M. R. Sontag and J. R. Cunningham, “Corrections to absorbed dose calculations for tissue inhomogeneities,” Med. Phys. 4, 431436 (1977).
http://dx.doi.org/10.1118/1.594329
57.
57.M. R. Sontag and J. R. Cunningham, “The equivalent tissue-air ratio method for making absorbed dose calculations in a heterogeneous medium,” Radiology 129, 787794 (1978).
58.
58.C. Reft, R. Alecu, I. J. Das, B. J. Gerbi, P. Keall, E. Lief, B. J. Mijnheer, N. Papanikolaou, C. Sibata, and J. Van Dyk, “Dosimetric considerations for patients with HIP prostheses undergoing pelvic irradiation. Report of the AAPM Radiation Therapy Committee Task Group 63,” Med. Phys. 30, 11621182 (2003).
http://dx.doi.org/10.1118/1.1565113
59.
59.U. Ramm, M. Damrau, S. Mose, K. H. Manegold, C. G. Rahl, and H. D. Bottcher, “Influence of CT contrast agents on dose calculations in a 3D treatment planning system,” Phys. Med. Biol. 46, 26312635 (2001).
http://dx.doi.org/10.1088/0031-9155/46/10/308
60.
60.G. Williams, M. Tobler, D. Gaffney, J. Moeller, and D. D. Leavitt, “Dose calculation errors due to inaccurate representation of heterogeneity correction obtained from computerized tomography,” Med. Dosim. 27, 275278 (2002).
http://dx.doi.org/10.1016/S0958-3947(02)00147-4
61.
61.J. Lees, L. Holloway, M. Fuller, and D. Forstner, “Effect of intravenous contrast on treatment planning system dose calculations in the lung,” Australas. Phys. Eng. Sci. Med. 28, 190195 (2005).
http://dx.doi.org/10.1007/BF03178715
62.
62.D. Létourneau, M. Finlay, B. O’Sullivan, J. N. Waldron, B. J. Cummings, J. Ringash, J. J. Kim, A. J. Bayley, and L. A. Dawson, “Lack of influence of intravenous contrast on head and neck IMRT dose distributions,” Acta Oncol. 47, 9094 (2008).
http://dx.doi.org/10.1080/02841860701418861
63.
63.F. K. Lee, C. C. Chan, and C. K. Law, “Influence of CT contrast agent on dose calculation of intensity modulated radiation therapy plan for nasopharyngeal carcinoma,” Journal of Medical Imaging and Radiation Oncology 53, 114118 (2009).
http://dx.doi.org/10.1111/j.1754-9485.2009.02046.x
64.
64.A. Zabel-du Bois, B. Ackermann, H. Hauswald, O. Schramm, G. Sroka-Perez, P. Huber, J. Debus, and S. Milker-Zabel, “Influence of intravenous contrast agent on dose calculation in 3-D treatment planning for radiosurgery of cerebral arteriovenous malformations,” Strahlenther. Onkol. 185, 318324 (2009).
http://dx.doi.org/10.1007/s00066-009-1927-6
65.
65.F. Araki, R. Ikeda, N. Moribe, Y. Shirakawa, M. Hatemura, T. Shimonobou, Y. Hirata, T. Takada, M. Takahashi, and M. Matoba, “Dose calculation for asymmetric photon fields with independent jaws and multileaf collimators,” Med. Phys. 27, 340345 (2000).
http://dx.doi.org/10.1118/1.598836
66.
66.M. J. Day, “A note on the calculation of dose in x-ray fields,” Br. J. Radiol. 23, 368369 (1950).
http://dx.doi.org/10.1259/0007-1285-23-270-368
67.
67.M. D. Mills, K. R. Hogstrom, and P. R. Almond, “Prediction of electron beam output factors,” Med. Phys. 9, 6068 (1982).
http://dx.doi.org/10.1118/1.595138
68.
68.F. M. Khan, K. P. Doppke, K. R. Hogstrom, G. J. Kutcher, R. Nath, S. C. Prasad, J. A. Purdy, M. Rozenfeld, and B. L. Werner, “Clinical electron-beam dosimetry: Report of AAPM Radiation Therapy Committee Task Group No. 25,” Med. Phys. 18, 73109 (1991).
http://dx.doi.org/10.1118/1.596695
69.
69.B. J. Gerbi, J. A. Antolak, F. C. Deibel, D. S. Followill, M. G. Herman, P. D. Higgins, M. S. Huq, D. N. Mihailidis, E. D. Yorke, K. R. Hogstrom, and F. M. Khan, “Recommendations for clinical electron beam dosimetry: Supplement to the recommendations of Task Group 25,” Med. Phys. 36, 32393279 (2009).
http://dx.doi.org/10.1118/1.3125820
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/content/aapm/journal/medphys/38/1/10.1118/1.3521473
2010-12-30
2015-07-28

Abstract

The requirement of an independent verification of the monitor units (MU) or time calculated to deliver the prescribed dose to a patient has been a mainstay of radiation oncology quality assurance. The need for and value of such a verification was obvious when calculations were performed by hand using look-up tables, and the verification was achieved by a second person independently repeating the calculation. However, in a modern clinic using CT/MR/PET simulation, computerized 3D treatment planning, heterogeneity corrections, and complex calculation algorithms such as convolution/superposition and Monte Carlo, the purpose of and methodology for the MU verification have come into question. In addition, since the verification is often performed using a simpler geometrical model and calculation algorithm than the primary calculation, exact or almost exact agreement between the two can no longer be expected. Guidelines are needed to help the physicist set clinically reasonable action levels for agreement. This report addresses the following charges of the task group: (1) To re-evaluate the purpose and methods of the “independent second check” for monitor unit calculations for non-IMRT radiation treatment in light of the complexities of modern-day treatment planning. (2) To present recommendations on how to perform verification of monitor unit calculations in a modern clinic. (3) To provide recommendations on establishing action levels for agreement between primary calculations and verification, and to provide guidance in addressing discrepancies outside the action levels. These recommendations are to be used as guidelines only and shall not be interpreted as requirements.

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Scitation: Verification of monitor unit calculations for non-IMRT clinical radiotherapy: Report of AAPM Task Group 114
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/38/1/10.1118/1.3521473
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