研究目的
The establishment and application of an indirect method that used a spectral model based on generalized simulated annealing algorithm to determine the spectrum of clinical linear accelerators photons based on the transmission curve.
研究成果
The Generalized Simulated Annealing technique is effective for reconstructing the spectrum of LINACs, showing great agreement with spectra obtained from treatment planning systems. The method can be used for precise calculations of quantities related to clinical beams, such as percentage depth doses and beam quality index.
研究不足
The method requires specialized equipment and expertise for transmission measurements. The accuracy of the reconstructed spectrum depends on the quality of the transmission data and the parameters chosen for the generalized simulated annealing algorithm.
1：Experimental Design and Method Selection:
The method involves analyzing the transmission of X-rays through different thicknesses of aluminum attenuators to reconstruct the photon spectrum using a generalized simulated annealing algorithm.
2：Sample Selection and Data Sources:
Transmission data was measured for photons from a 6 MV linear accelerator through aluminum blocks of varying thicknesses.
3：List of Experimental Equipment and Materials:
Ionization chamber FARMER FC65-G coupled to an electrometer IBA-DOSE1, aluminum blocks.
4：Experimental Procedures and Operational Workflow:
Transmission measurements were normalized and processed using a program written in C++ to fit the measured and calculated transmission data, minimizing a cost function to obtain the photon fluence spectrum.
5：Data Analysis Methods:
The generalized simulated annealing algorithm was used for spectrum reconstruction, with validation through comparison with spectra obtained from treatment planning systems and calculation of dosimetric quantities.
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