Calculating the Dosimetry Distribution of Leksell Gamma Knife in Phantom Zubal Head by Using MCNP5
Leksell Gamma Knife (LGK) is one of the most modern radiosurgery equipment in treating small volume brain cancer by using gamma-rays emitted by Co60 sources. In this paper, the MCNP5 code was used to calculate the absorbed dose distribution of LGK with 201 sources in different collimators diameters (4; 8; 14 and 18 mm) to Zubal head phantoms (a human-head contain more than 15 kinds of material about cerebral cortex, spinal cord, cartilage, orbit, bone...). The depth-dose was investigated. Zubal phantom was used to compare if there is any difference between doses estimated by using water phantoms and doses in real radiosurgery. The results showed that the dosimetry Fig. 1 Leksell Gamma Knife - Model C concentrated in center area of the Zubal phantom. These results were compared with the Gamma Plan at FWHM, there was no large difference between absorbed doses. Gamma Plan To ensure the quality of the planning system, MCNP program was used accompany with the Leksell Gamma Knife simulation is a good complementary tool to achieved this Unit. Thus, it requires another program to verify the accuracy purpose. In this paper, we used MCNP5 to simulate LGK of the Gamma Plan. Calculating the absorbed dose in Zubal device for calculation dose distribution in Zubal head head phantom using MCNP5 code was considered to another phantom. This result was calculated through tally FMESH method for testing the accuracy of the Gamma Plan. MCNP5 . We got the graph to display the dose distribution on x, z code was used for calculating absorbed dose in phantom Zubal axis.head. These results were appropriate to real treatments. Simultaneously, MCNP5 is first used for calculating absorbed dose and treatment planning.
KeywordsLeksell Gamma Knife Gamma Plan dose distribution Zubal head phantom MCNP
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