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Change of Dose Exposure and Improvement of Image Quality by Additional Filtration in Mammography

유방촬영용장치 부가필터에 따른 선량변화 및 화질개선

  • Cho, Woo Il (Department of Medical Physics, Kyonggi University) ;
  • Kim, Young Kuen (Department of Radiotechnology Kwang-ju Health Collige) ;
  • Lee, Gil Dong (Department of Electron Physics, Kyonggi University)
  • 조우일 (경기대학교 대학원 의학물리학과) ;
  • 김영근 (광주보건대학 방사선학과) ;
  • 이길동 (경기대학교 전자물리학과)
  • Received : 2013.04.18
  • Accepted : 2013.05.29
  • Published : 2013.06.30

Abstract

Recently, the interest on exposure to radiation is rising. The radiation exposure of mammography is higher in absorbed dose than of X-ray, therefore unnecessary exposure needs to be reduced, and higher image quality is needed. Generally, ray quality of the radiation imaging is an important factor that determines image quality and the amount of ray exposure, and they are affected by tube voltage and added filter. The X-ray energy that is exposed from mammography device is generally a continuous spectrum, which includes low energy that has minute influence on the image quality, and high energy that hinders contrast on image. Currently, molybdenum (Mo) and rhodium (Rh) are the most used added filters for mammography device, and they are used differently according to the energy region of X-ray. This study aims to find out the degree of reduction in exposure dose according to the thickness of aluminum (Al), and to study the changes in image quality and dose when the added filter plates that are made with niobium (Nb) or zirconium (Zr) are used, other than molybdenum (Mo) and rhodium (Rh), the two most used added filters that have similar atomic number and K-absorption regions as Nb and Zr. In this study, single-added filters of molybdenum (Mo), niobium (Nb), and zirconium (Zr) are used, and in some cases, Aluminum (Al) is combined with the single filters. In this case, image quality is considered to be improved depending on the type of added filters, and by using Aluminum (Al) filter together with the others, unnecessary X-ray of low energy would be absorbed, therefore the dose is expected to decrease without any influence when the concentration level becomes identical.

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