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Evaluation of Effective Factors on The Mammographic Images Utilizing Monte Carlo Simulation

Khodajou Chokami, Hamid Reza | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46010 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Sohrabpour, Mostafa
  7. Abstract:
  8. The Scattered radiation is the principal factor affecting the quality of the digital and screen-film mammography images. The contrast improvement factor and bucky factor which are also referred to as the benefit and risk of the anti-scattered grid cannot be properly assessed without a detailed knowledge of the scattered radiation. In this work the scatter to primary ratio has been calculated and an anti-scatter grid has been designed based on the reduction of the scattered radiation to reduce the patient dose to a minimum level and to improve the image quality simultaneously.The MCNPX 2.6.0 Monte Carlo code has been used to improve the geometry of the anti-scatter grid to both reduce the patient dose and to obtain the maximum contrast. Simulation of the image detector has been based on Perfect Energy Integrating Detector (PEID). The simulation of the geometric arrangement has been based on IEC 60627 international standard. The performance of some 91 different anti-scatter grid with a PMMA phantom and a tube voltage of 28 kVp has been evaluated. The optimized grid in this work has BF=2.34, CIF=1.63, Strip thickness of 40 μm and interspace distance of 187.3 μm and height of 1.12 μm respectively. Based on the obtained results this grid has produced the least dose to the patient compatible with The concept of ALARA, and the maximum improvement on the image contrast
  9. Keywords:
  10. Mammography ; Poly Methylmethacrylate ; Monte Carlo N-Particle Extended ; Breast Cancer ; Contrast Improvement Factor (CIF) ; Scatter to Primary Ratio ; As Low As Reasonably Code (ALARA)Concept

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