Comparison of two different filter-target combinations effect in breast absorbed dose in mammography and evaluation of influencing factors with MCNPX
Document Type : Research Paper
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Abstract
One of the common methods of breast cancer diagnosis is x-ray mammography. Because of the sensitivity of the breast tissue, patient absorbed dose in the mammography is very important. The purpose of this study is investigation of the influencing factors on the amount of absorbed dose and comparison of the absorbed dose by use of the target-filters Mo-Mo and W-Rh in the mammography device. In this study, the simulation of the x-ray tube of the mammography device were done by use of the MCNPX code, and spectrum of the common filter of Mo-Mo and newer compound of W-Rh were calculated. Then, for calculation of the absorbed dose, the breast phantom condition were simulated. We compare absorbed dose of the two common target-filter combinations which used in the mammography system. In addition to, we study the effect of the different factors; such as voltage, thickness of skin and glandular tissue of the breast on the absorbed dose level. Patient absorbed dose by use of the target-filter combination of W-Rh is less than the Mo-Mo combination, so this combination can be a good alternative for Mo-Mo target-filter. The present study shows that the voltage, thickness of skin and glandular tissue of the breast has a significant effect on the patient absorbed dose.
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