An alternative approach to compensators design for photon beams used in radiotherapy (CROSBI ID 133394)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Jurković, Slaven ; Žauhar, Gordana ; Bistrović, Matija ; Faj, Dario ; Kaliman, Zoran ; Smilović-Radojčić, Đeni
engleski
An alternative approach to compensators design for photon beams used in radiotherapy
The use of compensators in order to achieve desired dose distribution has a long history and is a well-established technique in radiation therapy planning. There are several different calculation methods for determining a compensator's thickness. An alternative method that is based on the Cunningham's modification of Clarkson's method to calculate scattered radiation in beams with an inhomogeneous cross-section is proposed. It is well known that the total dose distribution of radiotherapy photon beam consists of the contributions of the primary beam, attenuated by the tissue layer, and the scattered radiation generated by the primary radiation in single and multiple photon scatter events. The scattered component can be represented as a function of the primary radiation. The central point of our method is the numerical estimation of the primary distribution required to achieve the desired total distribution. Now using the calculated primary distribution, the shape of the modulator could be determined. In this way the contribution of the scattered component is validated in a more accurate way than using effective attenuation coefficients, which is a common practice. The method is verified in various clinical situations and compared with the standard method. The accuracy, although dependent on geometry, was improved by at least 2%. With more complex geometries there is an even higher gain in accuracy with our method when compared to the standard method.
radiation therapy; compensators
Proceedings of the 10th International Symposium on Radiation Physics - ISRP 10 Coimbra, Portugal 17-22 September 2006 Edited by M.I. Lopes, J.E. Fernández, W.L. Dunn and M.M.R. Costa
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Podaci o izdanju
580 (1)
2007.
530-533
objavljeno
0168-9002
10.1016/j.nima.2007.05.222