Dosimetric uncertainness in verification of intensity modulated photon beams

Jurković, Slaven (2010) Dosimetric uncertainness in verification of intensity modulated photon beams. Doctoral thesis, Faculty of Science > Department of Physics.

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Abstract

The doctoral thesis presents method for the calculation of the compensators’ shape to modulate linear accelerators’ beams. Characteristic of the method is more strict calculation of the scattered radiation in beams with an inhomogeneous cross-section than it was before. Method could be applied in various clinical situations. It's dosimetric verification was made in phantoms, measuring dose distributions using ionization chambers as well as radiographic film. Therefore, ionization chambers were used for the evaluation of modulator shape and film was used for the evaluation of two-dimensional dose distributions. It is well known that dosimetry of the intensity modulated photon beams is rather complicated regarding inhomogeneity of the dose ditribution. The main reason for that is the beam modulator which changes spectral distribution of the beam. Possibility of use different types of detectors for the measurements of dose distributions in modulated photon beams and their accuracy were examined. Small volume ionization chambers, different diodes and amorphus silicon detector and radigraphic film were used. Measured dose distributions were compared between each other as well as with distributions simulated using Monte Carlo particle transport algorithm. In this way the most accurate method for the verification of modulate photon beams is suggested.

Item Type: Thesis (Doctoral thesis)
Keywords: intensity modulation ; compenstators ; dosimetry ; Monte Carlo simulation
Supervisor: Faj, Dario
Date: 12 November 2010
Number of Pages: 87
Subjects: NATURAL SCIENCES > Physics
Divisions: Faculty of Science > Department of Physics
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 21 Dec 2013 23:16
Last Modified: 23 Dec 2013 10:39
URI: http://digre.pmf.unizg.hr/id/eprint/39

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