Nucletron B.v.

Iba S.a.

Anders Ahnesjo

Erik Grusell

Tufve Nyholm

Goran Rikner

Karin Eklund

Jorgen Olofsson

Camilla Ronnqvist

Mikael Karlsson

A detector response correction arrangement and method is proposed for online determination of correction factors for arbitrary positions from arbitrary incident fluence distributions. As modern radiotherapy utilizes more of the available degrees of freedom of radiation machines, dosimetry has to be able to present reliable measurements for all these degrees of freedom. To determine correction factors online during measurement, Monte Carlo technique is used to precalculate fluence pencil kernels from a monodirectional beam to fully describe the particle fluence in an irradiated medium. Assuming that the particle fluence is not significantly altered by the introduction of a small detector volume, the fluence pencil kernels () can be integrated (), and correction factors () determined, e.g. by Cavity Theory, in different positions for the detector material.

Detector response modeling

A method for calculating the radiation dose distribution for a radiation treatment system for the purpose of radiation therapy of an animal body, wherein the radiation beam of the radiation treatment system exhibits a specific beam field size and shape at different depths as well as to a device for calculating the radiation dose distribution for a radiation treatment system for the purpose of radiation therapy of an animal body, wherein the radiation beam of the radiation treatment system exhibits a specific beam field size and shape at different depths. The method is characterized by the steps of i) determining at least one beam quality index being representative for the radiation beam being used, and ii) calculating the radiation dose distribution in the specific beam field using parameterized dose deposition kernels based on the at least one beam quality index.

Method and device for calculating the radiation dose distribution for a radiation treatment system for the purpose of radiation therapy of an animal body

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Uppsala, Sweden

Anders Ahnesjo