DOI: https://doi.org/10.15587/2313-8416.2014.27342

Electron accelerator dosimetry in radiation therapy: photon backscattering

Oleh Ovsiienko, Mykola Budnyk

Аннотация


Today 52 % of patients with a cancer get radiation therapy. It is developed the experimental procedure for determining the backscatter factor for Siemens Oncor Impression Plus linear accelerator. The experiments were carried out based on water phantom. This technique can be also used for other kinds of accelerators.


Ключевые слова


backscatter factor; multi-leaf collimator; linear electron accelerator; monitor chamber; radiation therapy; cancer

Полный текст:

PDF (English)

Литература


Khan, F. M. (2003). The physics of radiation therapy. Philadelphia, USA: Lippincot Williams & Wilkins, 531.

Ravikumar, M., Ravichandran, R. (2001). Measurement of backscattered radiation from secondary collimator jaws into the beam monitor chamber from a dual energy linear accelerator. Strahlentherapie und Onkologie, 177, 670–675. doi: 10.1007/pl00002382

Patterson, M. S., Shragge, P. C. (1981). Characteristics of an 18 MV photon beam from a Therac 20 Medical Linear Accelerator. J. Med. Phys., 8, 312–318. doi: 10.1118/1.594833

Lam, K. L., Muthuswamy, M. S., Ten Haken, R. K. (1996). Flattening-filterbased empirical methods to parametrize the head scatter factor. J. Med. Phys., 23, 343–352. doi: 10.1118/1.597798

Luxton, G., Astrahan, M. A. (1998). Output factor constituents of high energy photon beam. J. Med. Phys., 15, 88–91. doi: 10.1118/1.596300

Hung, P.H., Chu, J.C., Bjarngard, B. E. (1987). The effect of collimator backscatter radiation on photon output of linear accelerators. J. Med Phys., 14, 268–269. doi: 10.1118/1.596137

Kase, K. R, Svensson, G. K. (1986). Head Scatter data for several linear accelerators (4-18MV). J. Med. Phys., 13, 530–532. doi: 10.1118/1.595857

Kubo, H. (1989). Telescopic measurements of backscattered radiation from secondary collimator jaws to a beam monitor chamber using a pair of slits. J. Med Phys., 6, 295–298. doi: 10.1118/1.596381

Lam, K. L, Muthuswamy, M. S, Ten Haken, R. K. (1998). Measurement of backscattering to the beam monitor chamber of medical linear accelerators using target charge. J. Med. Phys., 25, 334–338. doi: 10.1118/1.598203

Scrimger, J. W. (1977). Backscatter from high atomic number materials in high energy photon beams. Radiology, 124, 815–817. doi: 10.1148/124.3.815

Watts, D. L., Ibbott, G. S. (1987). Measurement of beam current and evaluation of scatter production in an 18-MeV accelerator. J. Med. Phys., 14, 662–664. doi: 10.1118/1.596036

Zrenner, M., Krieger, H. (1999). Determination of monitor radiation scattering contribution in photon radiation of clinical electron linear accelerators. Strahlentherapie und Onkologie, 175, 515–523.

Kubo, H., Lo, K. K. (1989) Measurements of backscattered radiation from Therac-20 collimator and trimmer jaws into beam monitor chamber. J. Med. Phys., 16, 292–294. doi: 10.1118/1.596380

Duzenli, C., McClean, B., Field, C. (1993). Backscatter into the beam monitor chamber: Implications for dosimetry of asymmetric collimators. J. Med. Phys., 20, 363–367.

Ovsiienko, O., Budnyk, M. (2012). Transition from standard 2-D до 3-D conform radiation therapy and intensity modulated radiotherapy. Proceeding of 2nd Int. Seminar “Medical Physics: state-of-art, problems, ways of development”, Kyiv, Ukraine, 101–104.

Ovsiienko, O., Budnyk, M. (2013). Dosimeters for radiotherapy apparatus: advantages and drawbacks. Proceeding of 3rd Int. Seminar “Medical Physics: state-of-art, problems, ways of development, novel technologies”, Kyiv, Ukraine, 121–125.

Ovsiienko, O., Budnyk, M. (2013). Dosimetry tools and techniques for IMRT in radiation therapy (review). Radiation diagnostics & radiation therapy, 3–4, 85–88.


Пристатейная библиография ГОСТ


Khan, F. M. The physics of radiation therapy [Text] / F. M. Khan. –Lippincot Williams & Wilkins, Philadelphia (USA), 2003. – 531 p.

Ravikumar, M. Measurement of backscattered radiation from secondary collimator jaws into the beam monitor chamber from a dual energy linear accelerator [Text] / M. Ravikumar, R. Ravichandran // Strahlentherapie und Onkologie. – 2001. – Vol. 177, Issue 12. – P. 670–675. doi: 10.1007/pl00002382 

Patterson, M. S. Characteristics of an 18 MV photon beam from a Therac 20 Medical Linear Accelerator [Text] / M. S. Patterson, P. C. Shragge // J. Med. Phys. – 1981. – Vol. 8, Issue 3. – P. 312–318. doi: 10.1118/1.594833 

Lam, K. L. Flattening-filterbased empirical methods to parametrize the head scatter factor [Text] / K. L. Lam, M. S. Muthuswamy, R. K. Ten Haken // J. Med. Phys. – 1996. – Vol. 23, Issue 3. – P. 343–352. doi: 10.1118/1.597798 

Luxton, G. Output factor constituents of highenergy photon beam [Text] / G. Luxton, M. A. Astrahan // J. Med. Phys. – 1998. – Vol. 15, Issue 1. – P. 88–91. doi: 10.1118/1.596300 

Hung, P. H. The effect of collimator backscatter radiation on photon output of linear accelerators [Text] / P. H. Hung, J. C. Chu, B. E. Bjarngard // J. Med Phys. – 1987. – Vol. 14, Issue 2. – P. 268–269. doi: 10.1118/1.596137 

Kase, K. R. Head Scatter data for several linear accelerators (4-18MV) [Text] / K. R. Kase, G. K. Svensson // J. Med Phys. – 1986. – Vol. 13, Issue 4. – P. 530–532. doi: 10.1118/1.595857 

Kubo, H. Telescopic measurements of backscattered radiation from secondary collimator jaws to a beam monitor chamber using a pair of slits [Text] / H. Kubo // J. Med Phys. – 1989. – Vol. 16, Issue 2. – P. 295–298. doi: 10.1118/1.596381 

Lam, K. L. Measurement of backscattering to the beam monitor chamber of medical linear accelerators using target charge [Text] / K. L. Lam, M. S. Muthuswamy, R. K. Ten Haken // J. Med Phys. – 1998. – Vol. 25, Issue 3. – P. 334–338. doi: 10.1118/1.598203 

Scrimger, J. W. Backscatter from high atomic number materials in high energy photon beams [Text] / J. W. Scrimger // Radiology. – 1977. – Vol. 124, Issue 3. – P. 815–817. doi: 10.1148/124.3.815 

Watts, D. L. Measurement of beam current and evaluation of scatter production in an 18-MeV accelerator [Text] / D. L. Watts, G. S. Ibbott // J. Med Phys. – 1987. – Vol. 14, Issue 4. – P. 662–664. doi: 10.1118/1.596036 

Zrenner, M. Determination of monitor radiation scattering contribution in photon radiation of clinical electron linear accelerators [Text] / M. Zrenner, H. Krieger // Strahlentherapie und Onkologie. – 1999. – Vol. 175. – P. 515–523.

Kubo, H. Measurements of backscattered radiation from Therac-20 collimator and trimmer jaws into beam monitor chamber [Text] / H. Kubo, K.K. Lo // J. Med Phys. – 1989. – Vol. 16, Issue 2. – P. 292–294. doi: 10.1118/1.596380 

Duzenli, C. Backscatter into the beam monitor chamber: Implications for dosimetry of asymmetric collimators [Text] / C. Duzenli, B. McClean, C. Field // J. Med Phys. – 1993. – Vol. 20, Issue 2. – P. 363–367. doi: 10.1118/1.597077 

Ovsiienko, O. Transition from standard 2-D до 3-D conform radiation therapy and intensity modulated radiotherapy [Text] / O. Ovsiienko, M. Budnyk // Proceeding of 2nd Int. Seminar “Medical Physics: state-of-art, problems, ways of development”, Kyiv, Ukraine, 2012. – P. 101–104.

Ovsiienko, O. Dosimeters for radiotherapy apparatus: advantages and drawbacks [Text] / O. Ovsiienko, M. Budnyk // Proceeding of 3rd Int. Seminar “Medical Physics: state-of-art, problems, ways of development, novel technologies”, Kyiv, Ukraine, 2013. – P. 121–125.

Ovsiienko, O. Dosimetry tools and techniques for IMRT in radiation therapy (review) [Text] / O. Ovsiienko, M. Budnyk // Radiation diagnostics & radiation therapy. – 2013. – Vol. 3–4. – P. 85–88.







Copyright (c) 2014 Олег Володимирович Овсієнко, Микола Миколайович Будник

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