Dosimetric characteristics of linear accelerator photon beams with small monitor unit settings

Medical Physics

Volumn 35, Issue 11, 2008, Pages 5172-5178

  Kang, Sei Kwon ^a   Cheong, Kwang Ho ^a   Hwang, Taejin ^a   Cho, Byung Chul ^a   Kim, Su Ssan ^a   Kim, Kyoung Ju ^a   Oh, Do Hoon ^a   Bae, Hoonsik ^a   Suh, Tae Suk ^b  

^a Hallym University   (South Korea)

^b The Catholic University of Korea   (South Korea)

Author keywords

Beam characteristics; Dose rate; IMRT; Linear accelerator; Small monitor unit

Indexed keywords

BIOMEDICAL ENGINEERING; COMPUTERIZED TOMOGRAPHY; DETERIORATION; DOSIMETRY; LINEAR ACCELERATORS;

BEAM CHARACTERISTICS; DIODE ARRAY DETECTORS; DOSE RATE; IMRT; INTENSITY-MODULATED RADIATION THERAPY; MONITOR UNITS; MULTILEAF COLLIMATORS; VARIAN MEDICAL SYSTEMS;

RADIOTHERAPY;

ARTICLE; CANCER RADIOTHERAPY; INTENSITY MODULATED RADIATION THERAPY; IONIZATION CHAMBER; LINEAR ACCELERATOR; MONITOR; PHOTON; PHOTON THERAPY; PRIORITY JOURNAL; RADIATION DOSE; RADIATION MEASUREMENT;

EID: 54949136185     PISSN: 00942405     EISSN: None     Source Type: Journal    
DOI: 10.1118/1.2995759     Document Type: Article

References (29)

1. Intensity Modulated Radiation Therapy Collaborative Working Group. " Intensity-modulated radiotherapy: Current status and issues of interest.," Int. J. Radiat. Oncol., Biol., Phys. 51, 880-914 (2001).
2. J. Z. Wang, X. A. Li, W. D. D'Souza, and R. D. Stewart, " Impact of prolonged fraction delivery times on tumor control: A note of caution for intensity-modulated radiation therapy (IMRT).," Int. J. Radiat. Oncol., Biol., Phys. 57, 543-552 (2003).
3. J. F. Fowler, J. S. Welsh, and S. P. Howard, " Loss of biological effect in prolonged fraction delivery.," Int. J. Radiat. Oncol., Biol., Phys. 59, 242-249 (2004).
4. V. Moiseenko, C. Duzenli, and R. E. Durand, " In vitro study of cell survival following dynamic MLC intensity-modulated radiation therapy dose delivery.," Med. Phys. 34, 1514-1520 (2007).
5. H. Paganetti, " Changes in tumor cell response due to prolonged dose delivery times in fractionated radiation therapy.," Int. J. Radiat. Oncol., Biol., Phys. 63, 892-900 (2005).
6. X. Mu, P. O. Loefroth, M. Karlsson, and B. Zackrisson, " The effect of fraction time in intensity modulated therapy: Theoretical and experimental evaluation of an optimization problem.," Radiother. Oncol. 68, 181-187 (2003).
7. M. Ravikumar, M. A. Asmary, R. A. Sultan, and H. A. Ghamdi, " Dose delivery accuracy of therapeutic photon and electron beams at low monitor unit settings.," Strahlenther. Onkol. 181, 796-799 (2005).
8. C. W. Cheng and I. J. Das, " Comparison of beam characteristics in intensity modulated radiation therapy (IMRT) and those under normal treatment condition.," Med. Phys. 29, 226-230 (2002).
9. M. B. Sharpe, B. M. Miller, D. Yan, and J. W. Wong, " Monitor unit settings for intensity modulated beams delivered using a step-and-shoot approach.," Med. Phys. 27, 2719-2725 (2000).
10. C. W. Cheng and I. J. Das, " Suppression dark current radiation in step-and-shoot intensity modulated radiation therapy by the initial pulse forming network.," Med. Phys. 29, 1974-1979 (2002).
11. C. B. Saw, S. Li, and K. M. Ayyangar, " Dose linearity and uniformity of a linear accelerator designed for implementation of multileaf collimation system-based intensity modulated radiation therapy.," Med. Phys. 30, 2253-2256 (2003).
12. J. L. Humm, A. Larsson, and E. P. Lief, " Dosimetric properties of a scanned beam microtron at low monitor unit settings: Importance for conformal therapy.," Med. Phys. 23, 329-335 (1996).
13. V. N. Hansen, P. M. Evans, G. J. Budgell, J. H. Mott, P. C. Williams, M. J. Brugmans, F. W. Wittkämper, B. J. Mijnheer, and K. Brown, " Quality assurance of the dose delivered by small radiation segments.," Phys. Med. Biol. 43, 2665-2675 (1998).
14. G. A. Ezzell and S. Chungbin, " The overshoot phenomena in step-and-shoot IMRT delivery.," J. Appl. Clin. Med. Phys. 2, 138-148 (2001).
15. M. M. Aspradakis, G. D. Lambert, and A. Steele, " Elements of commissioning step-and-shoot IMRT: Delivery equipment and planning system issues posed by small segment dimensions and small monitor units.," Med. Dosim. 30, 233-242 (2005).
16. R. J. Barish, R. C. Fleischman, and Y. M. Pipman, " Teletherapy beam characteristics: The first second.," Med. Phys. 14, 657-661 (1987).
17. A. K. Sharma, S. S. Supe, N. Anantha, and K. Subbarangaiah, " Dosimetric accuracy of a dual photon energy linac at low monitor setting for various pulse repetition frequencies.," Med. Dosim. 19, 47-49 (1994).
18. A. M. Stell, J. G. Li, O. A. Zeidan, and J. F. Dempsey, " An extensive log-file analysis of step-and-shoot intensity modulated radiation therapy segment delivery errors.," Med. Phys. 31, 1593-1602 (2004).
19. D. Letourneau, M. Gulam, D. Yan, M. Oldham and J. W. Wong, " Evaluation of a 2D diode array for IMRT quality assurance.," Radiother. Oncol. 70, 199-206 (2004).
20. P. A. Jursinic and B. E. Nelms, " A 2-D diode array and analysis software for verification of intensity modulated radiation therapy delivery.," Med. Phys. 30, 870-879 (2003).
21. T. J. Waldron, " Functional Requirements for IMRT.," in Intensity Modulated Radiation Therapy: State of the Art, edited by, J. R. Palta, and, T. R. Mackie, Medical Physics Monograph No. 29 (Medical Physics Publishing, Madison, WI, 2003), pp. 373-400.
22. D. Greene and P. C. Williams, Linear Accelerators for Radiation Therapy, 2nd ed. (Taylor & Francis, New York, 1997).
23. P. Xia, C. F. Chuang, and L. J. Verhey, " Communication and sampling rate limitations in IMRT delivery with a dynamic multileaf collimator system.," Med. Phys. 29, 412-423 (2002).
24. G. N. Grigorov, J. C. L. Chow, and R. B. Barnett, " Dosimetry limitations and a dose correction methodology for step-and-shoot IMRT.," Phys. Med. Biol. 51, 637-652 (2006).
25. V. Y. Kuperman and W.-C. Lam, " Improving delivery of segments with small MU in step-and-shoot IMRT.," Med. Phys. 33, 1067-1073 (2006).
26. M. Oldham and S. Webb, " The optimization and inherent limitations of 3D conformal radiotherapy treatment plans of the prostate.," Br. J. Radiol. 68, 882-893 (1995).
27. G. Starkschall and P. J. Eifel, " An interactive beam-weight optimization tool for three-dimensional radiotherapy treatment planning.," Med. Phys. 19, 155-163 (1992).
28. J. D. Fenwick, W. A. Tome, H. A. Jaradat, S. K. Hui, J. A. James, J. P. Balog, C. N. DeSouza, D. B. Lucas, G. H. Olivera, T. R. Mackie, and B. R. Paliwal, " Quality assurance of a helical tomotherapy machine.," Phys. Med. Biol. 49, 2933-2953 (2004).
29. K. Otto, " Volumetric modulated arc therapy: IMRT in a single gantry arc.," Med. Phys. 35, 310-317 (2008).