Calculating dose distributions and wedge factors for photon treatment fields with dynamic wedges based on a convolution/superposition method

Medical Physics

Volumn 25, Issue 1, 1998, Pages 56-63

  Liu, H Helen ^a   McCullough, Edwin C ^a   Mackie, T Rock ^b  

^a MAYO CLINIC   (United States)

^b UNIVERSITY OF WISCONSIN SCHOOL OF MEDICINE AND PUBLIC HEALTH   (United States)

Author keywords

Convolution superposition; Dynamic wedge; Extra focal photon; Intensity modulation; Wedge factor

Indexed keywords

CONVOLUTION; MODULATION;

CONVOLUTION METHODS; CONVOLUTION/SUPERPOSITION; DOSE CALCULATION; DOSE DISTRIBUTIONS; INTENSITY MODULATIONS; INTENSITY-MODULATED; TREATMENT TABLE; WEDGE FACTOR;

PHOTONS;

ALGORITHM; ARTICLE; DOSIMETRY; DYNAMICS; PHOTON; PRIORITY JOURNAL; RADIATION FIELD; RADIOTHERAPY;

EID: 0031906459     PISSN: 00942405     EISSN: None     Source Type: Journal    
DOI: 10.1118/1.598173     Document Type: Article

References (27)

1. P. K. Kijewski, L. M Chin, and B. E. Bjarngard, "Wedge-shaped dose distributions by computer-controlled collimator motion," Med. Phys. 5, 426-429 (1978)
2. D. D. Leavitt, M. Martin, J. H. Moeller, and W. L. Lee, "Dynamic wedge field techniques through computer-controlled collimator motion and dose delivery," Med Phys. 17, 87-91 (1991).
3. J. Milan and R. E. Bentley, "The storage and manipulation of radiation dose data in a small digital computer," Br. J. Radiol. 47, 115-121 (1974).
4. S. J. Thomas and K. R. Foster, "Radiotherapy treatment planning with dynamic wedges - An algorithm for generating wedge factors and beam data," Phys. Med. Biol. 40, 1421-1433 (1995).
5. E. E. Klein, D. A. Low, A. S. Meigooni, and J. A. Purely, "Dosimetry and clinical implementation of dynamic wedge," Int. J. Radiat Oncol., Biol., Phys. 31, 583-591 (1995).
6. A. W. Beavis, S. J. Weston, and V. J. Whitton, "Implementation of the Varian EDW into a commercial RTP system," Phys. Med. Biol. 41, 1691-1704 (1996).
7. T. R Mackie, J. W. Scrimger, and J. J. Battista, "A convolution method of calculating dose for 15-MV x rays," Med. Phys. 12, 188-196 (1985)
8. A Boyer and E. Mok, "Photon dose distribution model employing convolution calculations," Med. Phys. 12, 169-177 (1985).
9. R. Mohan and C. Chui, "Differential pencil beam dose computation model for photons," Med. Phys 13, 64-73 (1986).
10. C S. Chui, T. LoSasso, and S. Spirou, "Dose calculation for photon beams with intensity modulation generated by dynamic jaw or multileaf collimators," Med. Phys. 21, 1237-1244 (1994).
11. P. Dunscombe and C. Ross, "Jaws 2: A description of in-air beam profiles for half blocked and dynamically wedged radiation fields," Med. Phys 20, 1705-1708 (1993).
12. H. H. Liu, T. R. Mackie, and E. C. McCullough, "A dual source photon beam model used in convolution/superposition dose calculations for clinical megavoltage x-ray beams," Med. Phys. 24, 1960-1974 (1997)
13. H. H. Liu, T. R. Mackie, and E. C. McCullough, "Calculating output factors for clinical photon beam radiotherapy using a convolution/superposition method based on a dual source photon beam model," Med. Phys. 24, 1975-1985 (1997)
14. T. R Mackie, A. Ahnesjö, P. Dickof, and A. Snider, "Development of a convolution/superposition method for photon beams," in Proceedings of the 9th International Conference on Computers in Radiotherapy, Den Haag, Amsterdam (Elsevier Science, Amsterdam, 1987), pp. 107-110.
15. A. Ahnesjö, "Collapsed cone convolution of radiant energy for photon dose calculation in heterogeneous media," Med. Phys. 16, 577-592 (1989).
16. T. R. Mackie, P. J. Reckwerdt, M. A Gehring, T. W. Holmes, S S. Kubsad, B. R. Thomadsen, C. A Sanders, B. Paliwal, and T. J Kinsella, "Clinical Implementation of the convolution/superposition method," in Proceedings of the 10th International Conference on Computers in Radiotherapy, Lucknow, India (Alpana Arts, Lucknow, India, 1990), pp. 322-325.
17. A. Ahnesjö, "A pencil beam model for photon dose calculation," Med. Phys. 19, 263-273 (1992).
18. K. R. Kase and G. K. Svensson, "Head scatter data for several linear accelerators (4-18 MV)," Med. Phys. 13, 530-532 (1986).
19. G. Luxton and M. A. Astrahan, "Output factor constituents of a high-energy photon beam," Med. Phys. 15, 88-91 (1987).
20. P. B. Dunscombe and J. M. Nieminen, "On the field-size dependence of relative output from a linear accelerator," Med. Phys. 19, 1441-1444 (1992).
21. D. A. Jaffray and J. J. Battista, "X-ray sources of medical linear accelerators: Focal and extra-focal radiation," Med. Phys. 20, 1417-1427 (1993).
22. E. L. Chaney and T. J. Cullip, "A Monte Carlo study of accelerator head scatter," Med. Phys. 21, 1383-1390 (1994).
23. T. C. Zhu and B. E. Bjärngard, "The head-scatter factor for small field sizes," Med. Phys. 21, 65-68 (1994).
24. 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, 2065-2074 (1995).
25. H. H. Liu, E. P. Lief, and E. C. McCullough, "Measuring dose distributions for enhanced dynamic wedges using a chamber detector array," Med. Phys. 24, 1515-1519 (1997).
26. A. M. Bidmead, A. J. Garton, and P. J. Childs, "Beam data measurements for dynamic wedges on Varian 600 C (6 MV) and 2100 C (6 and 10 MV) linear accelerators," Phys. Med Biol. 40, 393-411 (1995).
27. H. H. Liu, T. R. Mackie, and E. C. McCullough, "Calculating dose and output factors for wedged photon radiotherapy fields using a convolution/superposition method," Med. Phys. 24, 1714-1728 (1997).