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A Study on the Development of High-sensitivity AEC-sensor for Minimization of Dose Creep in Diagnostic Imaging System

진단영상 시스템에서 선량크리프 현상의 최소화를 위한 고감도 AEC 센서에 관한 연구

  • Kim, Kyo-Tae (Department of Biomedical Engineering, Inje University) ;
  • Han, Moo-Jae (Department of Biomedical Engineering, Inje University) ;
  • Heo, Ye-Ji (Department of Biomedical Engineering, Inje University) ;
  • Kim, Joo-Hee (Department of Emergency and Disaster Management, Inje University) ;
  • Kang, Sang-Sik (Department Radiological Science, International University of Korea) ;
  • Park, Ji-Koon (Department Radiological Science, International University of Korea) ;
  • Nam, Sang-Hee (Department of Biomedical Engineering, Inje University)
  • Received : 2016.06.16
  • Accepted : 2016.08.31
  • Published : 2016.08.31

Abstract

Dose creep is one of clinical errors that arises from the tester's inexperience or carelessness, and according to Task Group #116 of American Association of Physicists in Medicine, its continued occurrence is being reported in the digital method. At this point, the demand for an automatic exposure control device that minimizes the dose creep phenomenon and can improve reproducibility is increasing. In this study is to consider the automatic exposure control device sensor that can is not only easy to produce, but also reduce the dose creep phenomenon by conducting a research on high-efficient semiconductor sensor. As a result, the Intrinsic-type and PIN-type sensors have excellent optical property compared to Ref sensor, would have less shading effect, and have relatively low sensitivity, but would provide accurate feedback signals to automatic exposure control device with its consistent tendency according to exposure condition changes.

선량 크리프는 임상적 오류 중 하나로 검사자의 미숙 또는 부주의에 기인하여 발생하는 현상으로 AAPM Task Group #116에 의하면 디지털 방식의 시스템에서 지속적인 발생이 보고되고 있다. 이러한 현시점에서 선량 크리프 현상을 최소화할 뿐만 아니라 재현성 향상이 가능한 자동노출제어장치의 요구가 증가하고 있다. 이에 본 연구에서는 제작이 쉬울 뿐만 아니라 고효율 반도체 센서에 대한 연구를 수행함으로써 선량 크리프 현상을 저감할 수 있는 자동노출제어장치의 센서에 대하여 고찰하고자 하였다. 연구 수행 결과, 제작된 I형 센서 및 PIN형 센서의 경우 Ref 센서와 비교하면 광학적 특성이 우수하여 음영효과가 적게 나타날 것으로 사료되고, 대체로 낮은 민감도 특성이 나타나지만, 조사 조건 변화에 따른 일정한 추세를 가짐으로써 정확한 피드백 신호를 자동노출제어장치에 제공할 수 있을 것으로 사료된다.

Keywords

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