Journal of the Korean Society of Radiology (한국방사선학회논문지)

The Korean Society of Radiology (한국방사선학회)
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The Additional Filter and Ion Chamber Sensor Combination for Reducing Patient Dose in Digital Chest X-ray Projection

디지털 흉부엑스선 검사에서 환자선량 감소를 위한 부가필터와 Ion chamber 센서 조합

  • Lee, Jinsoo (Dept. of Radiology, Inje University Haeundae Paik Hospital) ;
  • Kim, Changsoo (Dept. of Radiological Science, Catholic University of Pusan)
  • 이진수 (인제대학교 해운대백병원 영상의학과) ;
  • 김창수 (부산가톨릭대학교 보건과학대학 방사선학과)
  • Received : 2015.02.28
  • Accepted : 2015.04.25
  • Published : 2015.04.30
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Abstract

In this paper, we studied additional filter and Ion chamber combinations to reduce patient dose without decreasing image quality in digital chest x-ray projection. The experiment set 125 kVp, 320 mA, AEC mode. Ion chamber sensors was divided by 4 cases of combinations, then, we measured patient dose and calculated organ dose using PCXMC. Also, physical image assessment using MTF was performed. As a results, The surface entrance dose and organ dose were the lowest when selecting both left and right Ion chamber sensors under the same conditions of additional filter. In image quality assessment, The spatial frequency scored 2.494 lp/mm which was highest when selecting both right and left Ion-chambers and 0.1 mmCu filter. And to conclude, to select both right and left Ion chamber sensors and 0.1 mmCu filter will help for acquiring good quality image as well as reducing patient dose.

본 연구는 디지털 흉부엑스선 검사에서 화질의 저하 없이 환자선량을 감소시키기 위한 부가필터와 Ion chamber 센서 조합을 알아보고자 하였다. 실험은 관전압 125 kVp, 관전류 320 mA, AEC모드로 하여 부가필터와 Ion chamber의 센서를 네 가지 조합으로 나누어 선량을 측정하고, PCXMC를 이용하여 장기선량을 산출하였다. 또한 MTF로 물리적 화질을 평가하였다. 그 결과 동일 부가필터의 조건하에서 Ion chamber의 좌우 양쪽 센서 모두를 선택했을 때 입사표면 선량과 장기선량이 가장 낮게 나타났으며, 화질평가에서는 좌우 Ion chamber의 선택과 0.1 mmCu 필터를 선택했을 때 공간주파수 값이 2.494 lp/mm로 가장 높게 나타났다. 결론적으로 디지털 흉부촬영 시 Ion chamber의 좌우 양쪽 센서와 0.1 mmCu 필터를 선택하는 것이 우수한 화질의 영상을 획득하고 환자선량 저감에 도움이 될 것이다.

Keywords

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