유방촬영용 X선장치의 선질 특성

Measurement of X-ray Quality in Mammography Unit

  • 이인자 (동남보건대학 방사선과) ;
  • 김정민 (고려대학교 보건대학 방사선과) ;
  • 허준 (동아엑스선기계 방사선기술연구소)
  • Lee, In-Ja (Dong Nam Health Sciences College) ;
  • Kim, Jung-Min (Health Sciences College, Korea University) ;
  • Huh, Joon (Institute of Radiological Technology, Dong-A X-ray Co., LTD)
  • 발행 : 1998.12.30

초록

In the mammography, X-ray beam quality is one of the most important factors. Using X-ray mammography unit model GE/CGR Senography 600T Senix H.F, Authors studied four subjects. 1. The aluminum attenuation rate in 30 kVp when used with or without compression plate. 2. HVLs at 5 different area of the X-ray field of $26{\sim}32kVp$. 3. HVLs to know the influence of corrected measurement or parallel measurement. 4. Film density with microdensitometer along and cross to the long axis of X-ray tube, in terms of the Heel effect in the X-ray field. The following results were obtained. 1. Beam quality of anode area was harder than cathode area. 2. The dose reduction rate of compression plate was approximately $65.5%{\sim}88.1%$ and the beam quality with compression plate was hardened up to 4kVp accordingly. 3. If the X-ray beam enters the attenuation plate obliquely, HVL was $2.6{\sim}2.9%$ harder than perpendicular to it. 4. Because of heel effect, the film density of cathode area is higher than anode area to film density of 0.5.

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