An EPID response calculation algorithm using spatial beam characteristics of primary, head scattered and MLC transmitted radiation

Medical Physics

Volumn 35, Issue 6, 2008, Pages 2224-2234

  Rosca, Florin ^a   Zygmanski, Piotr ^b  

^a Mass General/North Shore Cancer Center   (United States)

^b HARVARD MEDICAL SCHOOL   (United States)

Author keywords

EPID; Head scatter; IMRT QA

Indexed keywords

BIOMEDICAL ENGINEERING; DOSIMETRY; GAUSSIAN DISTRIBUTION; RADIOTHERAPY;

DOSIMETRIC PROPERTIES; ELECTRONIC PORTAL IMAGING DEVICES; EPID; IMRT QA; INTENSITY MODULATED RADIATION THERAPY; MULTILEAF COLLIMATORS; RESPONSE CALCULATION; TRANSMITTED RADIATION;

GAUSSIAN BEAMS;

ALGORITHM; ARTICLE; CALCULATION; COLLIMATOR; DEVICE; DOSIMETRY; ELECTRONIC PORTAL IMAGING DEVICE; INTENSITY MODULATED RADIATION THERAPY; LASER; MEASUREMENT; NORMAL DISTRIBUTION; PARAMETER; PRIORITY JOURNAL;

EID: 44449088459     PISSN: 00942405     EISSN: None     Source Type: Journal    
DOI: 10.1118/1.2911870     Document Type: Article

References (30)

1. D. Vetterli, H. Riem, D. M. Aebersold, R. H. Greiner, P. Manser, P. Cossmann, L. Kemmerling, E. J. Born, and R. Mini, " Introduction of a novel dose saving acquisition mode for the PortalVisionTM aS500 EPID to facilitate on-line patient setup verification.," Med. Phys. 31, 828-831 (2004).
2. Y. El-Mohri, L. E. Antonuk, J. Yorkston, K. W. Jee, M. Maolinbay, K. L. Lam, and J. H. Siewerdsen, " Relative dosimetry using active matrix flat-panel imager (AMFPI) technology.," Med. Phys. 26, 1530-1541 (1999).
3. B. M. C. McCurdy, K. Luchka, and S. Pistorius, " Dosimetric investigation and portal dose image prediction using an amorphous silicon electronic portal imaging device.," Med. Phys. 28, 911-924 (2001).
4. T. LoSasso, C. Chui, and C. Ling, " Comprehensive quality assurance for the delivery of intensity modulated radiotherapy with a multileaf collimator used in the dynamic mode.," Med. Phys. 28, 2209-2219 (2001).
5. E. E. Grein, R. Lee, and K. Luchka, " An investigation of a new amorphous silicon electronic portal imaging device for transit dosimetry.," Med. Phys. 29, 2262-2268 (2002).
6. J. Chang and C. C. Ling, " Using the frame average of aS500 EPID for IMRT verification.," J. Appl. Clin. Med. Phys. 4, 287-299 (2003).
7. P. B. Greer and C. C. Popescu, " Dosimetric properties of an amorphous silicon electronic portal imaging device for verification of dynamic intensity modulated radiation therapy.," Med. Phys. 30, 1618-1627 (2003).
8. B. Warketin, S. Steciw, S. Rathee, and B. G. Fallone, " Dosimetric IMRT verification with a flat-pannel EPID.," Med. Phys. 30, 3143-3155 (2003).
9. A. Van Esch, T. Depuydt, and D. P. Huyskens, " The use of an aSi -based EPID for routine absolute dosimetric pre-treatment verification of dynamic IMRT fileds.," Radiother. Oncol. 71, 223-234 (2004).
10. S. Steciw, B. Warketin, S. Rathee, and B. G. Fallone, " Three-dimensional IMRT verification with a flat-panel EPID.," Med. Phys. 32, 600-612 (2005).
11. P. Winkler, A. Hefner, and D. Georg, " Dose response characteristics of an amorphous silicon EPID.," Med. Phys. 32, 3095-3105 (2005).
12. L. N. McDermott, S. M. J. J. G. Nijsten, J. J. Sonke, M. Partridge, M. van Herk, and B. J. Mijnheer, " Comparison of ghosting effects for three commercial a-Si EPIDs.," Med. Phys. 33, 2448-2451 (2006).
13. P. B. Greer, P. Vial, L. Oliver, and C. Baldock, " Experimental investigation of the response of an amorphous silicon EPID to intensity modulated radiotherapy beams.," Med. Phys. 34, 4389-4398 (2007).
14. W. J. C. van Elmpt, S. M. J. J. G. Nijsten, R. F. H. Schiffeleers, A. L. A. J. Dekker, B. j. Mijnheer, P. Lambin, and A. W. H. Minken, " A Monte Carlo based three-dimensional dose reconstruction method derived from portal dose images.," Med. Phys. 33, 2426-2434 (2006).
15. A. Nalichowski, F. Rosca, D. Kadam, and P. Zygmanski, " Testing the accuracy and usefulness of the portal vision dosimetry system for large-volume and complex-geometry IMRT.," Med. Phys. 33, 6, 2139 (2006).
16. M. Partridge, M. Ebert, and B. M. Hesse, " IMRT verification by three-dimensional dose reconstruction from portal beam measurements.," Med. Phys. 29, 1847-1858 (2002).
17. S. Steciw, B. Warkentin, R. Rathee, and B. G. Fallone, " Three-dimensional IMRT verification with a flat-panel EPID.," Med. Phys. 32, 600-612 (2005).
18. W. Ansbacher, " Three-dimensional portal image-based dose reconstruction in a virtual phantom for rapid evaluation of IMRT plans.," Med. Phys. 33, 3369-3382 (2006).
19. J. V. Siebers, J. Ho Kim, L. Ko, P. J. Keall, and R. Mohan, " Monte Carlo computation of dosimetric amorphous silicon electronic portal images.," Med. Phys. 31, 2135-2146 (2004).
20. C. Kirkby and R. Sloboda, " Comprehensive Monte Carlo calculations of the point spread function for a commercial a-Si EPID.," Med. Phys. 32, 1115-1127 (2005).
21. G. Nicolini, A. Fogliata, E. Vanetti, and A. Clivio, " GLAaS: An absolute dose calibration algorithm for an amorphous silicon portal imager. Applications to IMRT verifications.," Med. Phys. 33, 2839-2851 (2006).
22. S. Y. Jang, O. N. Vassiliev, H. H. Liu, R. Mohan, and J. V. Siebers, " Development and commissioning of a multileaf collimator model in Monte Carlo dose calculations for intensity-modulated radiation therapy.," Med. Phys. 33, 770-781 (2006).
23. X. R. Zhu and M. T. Gillin, " Derivation of the distribution of extrafocal radiation for head scatter factor calculation.," Med. Phys. 32, 351-359 (2005).
24. W. Li, J. V. Siebers, and J. A. Moore, " Using fluence separation to account for energy spectra dependence in computing dosimetric a- Si EPID images for IMRT fields.," Med. Phys. 33, 4468-4480 (2006).
25. T. Zhu and B. E. Bjarngard, " Head scatter off-axis for megavoltage x-rays.," Med. Phys. 30, 533-543 (2003).
26. F. Lorenz, A. Nalichowski, F. Rosca, J. Kung, F. Wenz, and P. Zygmansky, " Spatial dependence of MLC transmission in IMRT delivery.," Phys. Med. Biol. 52, 5985-5999 (2007).
27. P. Zygmansky, F. Rosca, D. Kadam, F. Lorenz, A. Nalichowski, L. Court, and L. Chin, " Determination of depth and field size dependence of multileaf collimator transmission in intensity-modulated radiation therapy beams.," J. Appl. Clin. Med. Phys. 8 (4) (2007).
28. A. Boyer, " Basic applications of Multileaf Collimators: Report of the AAPM radiation therapy committee task group No. 50.," (2001).
29. J. V. Siebers, P. J. Keall, J. O. Kim, and R. Moham, " A method for photon beam Monte Carlo multileaf collimator particle transport.," Phys. Med. Biol. 47, 3225-3249 (2002).
30. S. Jiang, A. Boyer, and C. M. Ma, " Modeling the extrafocal radiation and monitor chamber backscatter for photon beam dose calculation.," Med. Phys. 28, 55-66 (2001).