Comput Math Methods Med - Dosimetric algorithm to reproduce isodose curves obtained from a LINAC.

Tópicos

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Resumo

In this work isodose curves are obtained by the use of a new dosimetric algorithm using numerical data from percentage depth dose (PDD) and the maximum absorbed dose profile, calculated by Monte Carlo in a 18MV LINAC. The software allows reproducing the absorbed dose percentage in the whole irradiated volume quickly and with a good approximation. To validate results an 18MV LINAC with a whole geometry and a water phantom were constructed. On this construction, the distinct simulations were processed by the MCNPX code and then obtained the PDD and profiles for the whole depths of the radiation beam. The results data were used by the code to produce the dose percentages in any point of the irradiated volume. The absorbed dose for any voxel's size was also reproduced at any point of the irradiated volume, even when the voxels are considered to be of a pixel's size. The dosimetric algorithm is able to reproduce the absorbed dose induced by a radiation beam over a water phantom, considering PDD and profiles, whose maximum percent value is in the build-up region. Calculation time for the algorithm is only a few seconds, compared with the days taken when it is carried out by Monte Carlo.

Resumo Limpo

work isodos curv obtain use new dosimetr algorithm use numer data percentag depth dose pdd maximum absorb dose profil calcul mont carlo mv linac softwar allow reproduc absorb dose percentag whole irradi volum quick good approxim valid result mv linac whole geometri water phantom construct construct distinct simul process mcnpx code obtain pdd profil whole depth radiat beam result data use code produc dose percentag point irradi volum absorb dose voxel size also reproduc point irradi volum even voxel consid pixel size dosimetr algorithm abl reproduc absorb dose induc radiat beam water phantom consid pdd profil whose maximum percent valu buildup region calcul time algorithm second compar day taken carri mont carlo

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