Journal of radiological science and technology (대한방사선기술학회지:방사선기술과학)

Korean Society of Radiological Science (대한방사선과학회)
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Comparison Study on CNR and SNR of Thoracic Spine Lateral Radiography

흉추 측면검사 영상의 CNR과 SNR 측정의 비교 연구

  • Kim, Ki-Won (Department of Radiology, Samsung Medical Center) ;
  • Min, Jung-Whan (Department of Radiology, Shin-Gu University) ;
  • Lyu, Kwang-Yeul (Department of Radiology, Shin-Gu University) ;
  • Kim, Jung-Min (Korea University, College of Health Science, Department of Radiological Science) ;
  • Jeong, Hoi-Woun (Beakseok Culture University, Department of Radiological Science) ;
  • Lee, Joo-Ah (Department of Oncology, Catholic University of Korea Incheon St.Mary's Hospital) ;
  • Jung, Jae-Hong (Department of Oncology, Soonchunhyang University Bucheon Hospital) ;
  • Sung, Dong-Chan (Department of Radiology, Dong-Guk University Medical Center) ;
  • Park, Soon-Cheol (Department of Radiology, Kang-Dong Kyung-Hee University Medical Center)
  • 김기원 (삼성서울병원 영상의학과) ;
  • 민정환 (신구대학교 방사선과) ;
  • 유광열 (신구대학교 방사선과) ;
  • 김정민 (고려대학교 방사선학과) ;
  • 정회원 (백석문화대학교) ;
  • 이주아 (인천성모병원 방사선종양학과) ;
  • 정재홍 (부천순천향대학교병원 방사선종양학과) ;
  • 성동찬 (동국대학교일산병원 영상의학과) ;
  • 박순철 (강동경희대학교병원 영상의학과)
  • Received : 2013.11.01
  • Accepted : 2013.12.02
  • Published : 2013.12.31
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Abstract

This study was proven for the T-spine breathing technique in lateral projection, using computer radiography (CR), charge coupled device (CCD), indirect digital radiography (IDR) and direct digital radiography (DDR). All images were evaluated and compared with CNR and SNR measured with the mean pixels and the standard deviation as setting ROI of spinous process, pedicle, vertebral body, intervertebral foramen and intervertebral disk using Image J. In experiment results of 4 type detectors, T-spine breathing technique was indicated as excellent in ROI of spinous process, pedicle, vertebral body, intervertebral foramen and intervertebral disk. As T-spine breathing technique indicated excellent images compared to the existing T-spine lateral radiography, this method would be useful for elderly patients who have difficulty in deep exhalation. This study was indicated the application possibility of T-spine breathing technique by presenting contrast to noise ratio (CNR) and signal to noise ratio (SNR) with quantitative value in 4 type detectors.

흉추 측면검사에서의 T-spine breathing technique을 실제 임상에서 사용되고 있는 4가지 검출기인 computer radiography (CR), charge coupled device (CCD), indirect digital radiography (IDR)와 direct digital radiography (DDR)을 사용하여 임상 유용성을 넓히고자 하였다. 화질 평가는 흉추 측면검사의 평가요소 중 5곳 (극돌기, 추궁근, 추체, 추간공, 추간)을 Image J 프로그램을 이용하여 관심영역을 정하고 신호 평균값과 표준편차를 구하여 대조도 잡음비와 신호 대 잡음비를 측정하여 비교하였다. 실험결과 4가지 검출기에서 T-spine breathing technique에서 극돌기, 추궁근, 추체, 추간공, 추간의 5곳 구조에서 우수하게 나타났다. 기존의 T-spine exhalation technique에 비해 T-spine breathing technique으로 촬영한 영상은 우수한 화질을 제공하므로 추후 심호기가 어려운 고령환자들에게 유용한 방법이라 사료된다. 그리고 4가지 검출기에서 contrast to noise ratio (CNR)와 signal to noise ratio (SNR) 같은 정량적인 수치를 제시함으로써 T-spine breathing technique의 적용 가능성을 나타내었다.

Keywords

References

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