Journal of radiological science and technology (대한방사선기술학회지:방사선기술과학)

Korean Society of Radiological Science (대한방사선과학회)
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Effects of Exposure Dose Reduction by Optimization of Automatic Exposure Control Factors in Digital Radiographic Examination of Paranasal Sinus

부비동 디지털 엑스선검사에서 자동노출제어 조절인자의 최적화를 통한 조사선량 감소 효과

  • Jeong, Min-Gyu (Department of Radiology, ChungBuk National University Hospital) ;
  • Seoung, Youl-Hun (Department of Radiological Science, College of Health Medical Science, Cheongju University)
  • 정민규 (충북대학교병원 영상의학과) ;
  • 성열훈 (청주대학교 보건의료과학대학 방사선학과)
  • Received : 2021.06.15
  • Accepted : 2021.06.28
  • Published : 2021.06.30
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Abstract

The purpose of this study was to reduce dose while maintaining image quality during digital radiographic examination of paranasal sinus by using the automatic exposure control (AEC) system. The tube voltage was set as six stages that increased by about 10 kVp to 70 kVp, 81 kVp, 90 kVp, 102 kVp, 109 kVp and 117 kVp. And then the AEC system conditions were consisted of 9 setting environments, that change mode of the sensitivity (S200, S400, S800) and the density (+2.5, 0, -2.5). We measured automatically exposed tube current (mAs) under 54 conditions with combined these, and assessed SNR and PSNR through the acquired images. In addition, four radiologists performed a qualitative assessment of the acquired images for each combination on a five-point scale of the Likert. As a result, the lowest dose and the highest values of SNR and PSNR in images with a qualitative assessment more than 4 point were the AEC control factors of 90 kVp, S800, D2.5. We applied this condition to the clinical trial, it showed an effect of 83.1% reduction in exposure radiation dose (mR). Therefore, AEC system could be used as dose reduction technology if it understood and used related regulatory factors and physical characteristics.

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References

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