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Study on Image Quality and Radiation Dose due to the Arm Position in the Abdomen/Pelvis CT

복부/골반 CT 검사 시 팔의 위치에 따른 방사선 선량과 영상화질 비교 연구

  • Lee, Jongwoong (Dept. of Radiology, Kyung Hee University Hospital at Gang-dong) ;
  • Won, Doyeon (Dept. of Radiological Science, Daegu Health College) ;
  • Jung, Jaeeun (Dept. of Radiological Science, Daegu Health College) ;
  • Kim, Hyeongyun (Dept. of Radiological Science, Far East University)
  • 이종웅 (강동경희대학교병원 영상의학과) ;
  • 원도연 (대구보건대학교 방사선과) ;
  • 정재은 (대구보건대학교 방사선과) ;
  • 김형균 (극동대학교 방사선학과)
  • Received : 2015.08.03
  • Accepted : 2015.10.25
  • Published : 2015.10.30

Abstract

The one-year-follow-up test of abdomen/pelvis from 10 patients who were scanned more than twice a years were analyzed the radiation dose and image quality depend on the position of the arm retrospectively from January to December in 2013. There were classified two groups, group A was examined with raising an arm on standard position and group B was performed with lowering an arm, respectively. Group A of an average mAs from the first dose amount was shown 11.4% less compared to Group B. And the value of CTDI from Group B also was investigated 11.3% less. To compare the quality comparison of the second image as histogram value, the value of max from both of two groups was measured similarly. However, a big difference was shown from the value of min and SD, the short dose was appeared depends on the position of arm even though Group A was radiated more than Group B. Less exposure to the medical image quality only by working CT scan when the examiner actively raise the arm before the development and testing of high-end equipment introduction of complex algorithms for obtaining an optimized image will be provided to the patient.

2013년도 1월부터 12월까지 1년간 복부/골반 추적 검사를 시행한 환자 중 1년간 2회 이상 검사한 환자 10명에 대해 팔의 위치에 따른 방사선 선량과 image quality를 후향적으로 분석하였다. 팔을 올리고 표준 자세로 검사한 그룹을 A, 팔을 내리고 검사한 그룹을 B로 분류하였다. 첫 번째 선량비교에서 A 그룹은 B 그룹에 비해 평균 mAs 량이 11.4 % 적게 조사되었으며 CTDI 값도 11.3 % 작게 나타났다. 두 번째 영상의 화질 비교를 위한 histogram은 A 그룹과 B 그룹 모두 max 값은 비슷하게 측정되었지만 mean 값과 SD 값에서 큰 차이를 나타내 B 그룹이 A 그룹에 비해 선량을 더 주었지만 팔의 위치에 따라 선량 부족 현상이 나타났다. 최적의 영상을 획득하기 위하여 복잡한 알고리즘의 개발과 고사양의 장비도입 이전에 CT 검사 시 검사자가 적극적으로 팔을 올려서 검사하는 노력만으로 적은 피폭선량과 양질의 의료영상을 환자에게 제공할 수 있을 것이다.

Keywords

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