Effect of Automatic Exposure Control Marker with Chest Radiography in Radiation Reduction

자동노출제어를 사용한 X선 흉부촬영에서 AEC 표지자 사용에 따른 환자 피폭선량 감소 효과

  • Jung, Ji-Sang (Department of Radiology, Severance Hospital) ;
  • Choi, Byoung-Wook (Department of Radiology, Research Institute of Radiological Science, Severance Hospital, Yonsei University College of Medicine) ;
  • Kim, Sung-Ho (LISTEM) ;
  • Kim, Young-Mo (Konyang University Biomedical Engineering) ;
  • Shim, Ji-Na (Department of Radiology, Severance Hospital) ;
  • Ahn, Ho-Sik (Department of Radiology, Severance Hospital) ;
  • Jin, Duk-Eun (Department of Radiology, Severance Hospital) ;
  • Lim, Jae-Sik (Department of Radiology, Severance Hospital) ;
  • Kang, Sung-Ho (Department of Radiology, Severance Hospital)
  • 정지상 (세브란스병원 영상의학과) ;
  • 최병욱 (연세의대 영상의학교실) ;
  • 김성호 ((주) 리스템) ;
  • 김영모 (건양대학교 의공학부) ;
  • 심지나 (세브란스병원 영상의학과) ;
  • 안호식 (세브란스병원 영상의학과) ;
  • 진덕은 (세브란스병원 영상의학과) ;
  • 임재식 (세브란스병원 영상의학과) ;
  • 강성호 (세브란스병원 영상의학과)
  • Received : 2014.07.30
  • Accepted : 2014.09.15
  • Published : 2014.09.30

Abstract

This study focused on effects of patient exposure dose reduction with AEC (Auto Exposure Control) marker that is designed for showing location of AEC in X-ray Chest radiography. It included 880 adults who have to use Chest X-ray Digital Radiography system (DRS, LISTEM, Korea). AEC (Ion chambers are posited in top of both sides) are used to every adult and set X-ray system as Field size $17{\times}17inch$, 120kVp, FFD 180cm. 440 people of control group are posited on detector to include both sides of lung field and the other 440 people of experimental group are set to contact their lung directly to Ion chamber (making marker to shows location). Then, measured every DAP and, estimated patient effective dose by using PCXMC 2.0. The average age of control group (M:F=245:195) is 53.9 and the average BMI is 23.4. BMI ranges from under weight: 35, normal range: 279, over weight: 106 to obese: 20 and average DAP is 223.56mGycm2, Mean effective dose is 0.045mSv. The average age of experimental group (M:F=197:243) is 53.7 and the average BMI is 22.7. BMI ranges from under weight: 34, normal range: 315, over weight: 85 to obese: 6 and average DAP is 207.36mGycm2, Mean effective dose is 0.041mSv. Experimental group shows less Mean effective dose as 0.004mSv (9.7%) than control group. Also, patient numbers who got over exposure more than 0.056mSv (limit point to know efficiency of AEC marker) is 65 in control group (14.7%), 19 in experimental group (4.3%) and take statistics with t-Test. The statistical difference between two groups is 0.006. In order to use proper amount of X-ray in auto exposure controlled chest X-ray system, matching location between ion chamber and body part is needed, and using AEC marker (designed for showing location of ion chamber) is a way to reduce unnecessary patient exposure dose.

Acknowledgement

Supported by : 한국산업기술평가관리원

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