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The Effect of GPU for Radiation Transport of Photons and Electrons for dose Calculation

Osat, Saeed | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44930 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Sohrabpour, Mostafa; Vosoughi, Naser
  7. Abstract:
  8. In radiotherapy, dose calculation is one of the most important stages that should be carefully done for patient treatment planning. Dose calculation methods have been developed from early dose algorithms that used analytical methods to relatively recent high precision monte carlo methods.Monte carlo methods while very accurate in dose estimations usually suffer from long computation time. In the recent time the emphasis for reduction of the computation time has been focused on software techniques as well as on hardware technology development. One example of hardware development has been graphic processing unit (GPU) which was introduced in 2006 by the Nvidia to accelerate the processing and reduce the computation time.
    In this work GPU has been used to reduce the computation time of the monte carlo algorithm when used for dose estimation in the radiation treatment of cancer patients.We have utilized the DPM (Dose Planning Method) as the main platform for our particle transport in our basic calculation used for our sample problems. The GPU has then been utilized as the main hardware to accelerate the processing. Our combined system has been named GPUDPM. The accuracy and speed of the GPUDPM has been checked against the EGSnrc using five different sample phantoms. Our samples consisted of five slab phantoms of pure water (in different sizes), water-lung-water, water-lung-bone-water, water-lung-bone-tissue-water. The relative errors thus calculated for the slab phantoms when compared with the EGSnrc results ranged between 1.5-2.5 percent. The speed of computation of GPUDPM on the other hand was in the range of 250-350 when compared to EGSnrc speed
  9. Keywords:
  10. Graphic Processing ; Monte Carlo Method ; Dosimetry Calculations ; Photon Transport ; Dose Planning Method (DPM)

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