Journal of the Korean Society of Radiology (한국방사선학회논문지)

The Korean Society of Radiology (한국방사선학회)
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Structural Design of Digital Radiography Detector using Hybrid Method for the Improvement of Response Property by X-ray

X-ray 반응 특성 개선을 위한 Hybrid형 디지털 방사선 검출기의 구조 설계

  • Kim, Kyo-Tae (Dept. of Biomedical Engineering, Inje University) ;
  • Han, Moo-Jae (Dept. of Biomedical Engineering, Inje University) ;
  • Kim, Jin-Seon (Dept. of Biomedical Engineering, Inje University) ;
  • Heo, Ye-Ji (Dept. of Biomedical Engineering, Inje University) ;
  • Oh, Kyung-Min (Dept. of Biomedical Engineering, Inje University) ;
  • Park, Ji-Koon (Dept. of Radiological Science, International University of Korea) ;
  • Nam, Sang-Hee (Dept. of Biomedical Engineering, Inje University)
  • Received : 2015.08.18
  • Accepted : 2015.10.25
  • Published : 2015.10.30
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Abstract

Digital radiography is divided into the direct method using photoconductor and indirect method using phosphor based on the principles in acquiring the image information, but both have different advantages and disadvantages. Therefore, this study conducted a preliminary research on the structure of the hybrid detector that combined phosphor and photoconductor to improve the sensitivity of X-ray. As a result, when the tube voltage was adjusted at 30ms of exposure time, the direct structure displayed an overall excellent sensitivity, but at the exposure time of 50ms or more, the hybrid structure displayed a better outcome. This seems to have enough research value considering that various clinical examinations usually include 50ms or more exposure time.

디지털 방사선촬영 기술은 영상 정보를 획득하는 원리에 따라 광도전체를 이용하는 직접 방식과 형광체를 이용하는 간접 방식으로 구분되지만, 모두 다양한 장단점을 내포하고 있다. 이에 본 연구에서는 X-ray 민감도를 개선하고자 형광체 및 광도전체를 병용한 Hybrid형 검출기의 구조에 대한 기초 연구를 수행하였다. 실험 결과, 조사 시간을 30 ms로 고정하고 관전압을 변화할 경우 전체적으로 직접 방식의 구조에서 우수한 민감도가 나타났으나, 조사 시간이 50 ms 이상에서는 Hybrid 구조의 경우가 더 우수한 것으로 나타났다. 이는 임상에서 다양한 검사를 수행할 경우에 일반적으로 50 ms 이상의 조사시간을 이용한다는 점에서 충분한 연구적 가치를 가질 것으로 사료된다.

Keywords

References

  1. Kyung-Min Oh, Min-Seok Yoon, Min-Woo Kim, et al, "Radiation detector material development with multi-layer by hetero-junction for the reduction of leakage current", JKSR, Vol 3, No 1, pp. 11-15, 2009.
  2. Y.K. Lee, M.S. Yon, D.H. Kim, et al, "The study of X-ray detection characteristic and fabrication photoconductor film thickness for Screen printing method", JKSR, Vol. 3, No. 2, pp. 11-16, 2009.
  3. Youn-Bin Kim, Min-Seok Yun, Min-Woo Kim, et al, "Development of Radiation Image Sensor using Heterojunction", JKSR, Vol 3, No 3, pp. 27-35, 2009.
  4. M. schieber, H. Hermon, A. Zuck, et al, "High flux X-ray response of composite mercuric iodide detectors", Proceeding of the SPIE Conf, Vol. 3768, pp. 296, 1999.
  5. M. schieber, H. Hermon, A. Zuck, et al, "Polycrystalline mercuric iodide detectors", Proceeding of the SPIE Conf, Vol. 3770, pp. 146, 1999.
  6. S. H. Lee, Y. S. Kim, Y. B. Kim, et al, "A Study on Bismuth tri-iodide for X-ray direct and digital imagers", JKSR, Vol. 3, No. 2, pp. 27-31, 2009.
  7. Sung-Ho Cho, Seong-Uk Heo, Chi-Won Choi, et al. "Properties of Polycrystalline $HgI_2$ Films Fabricated by Using a Particle-in-Binder Method". JKPS, Vol. 52, No. 4, pp. 1123-1127, 2008. https://doi.org/10.3938/jkps.52.1123
  8. Kyung-Min Oh, Min-Seok Yon, Sung-Ho Cho, et al, "Laminate structure detectors for low dark current with photoconductors in digital X-ray imaging", Nucl. Instr. Meth. A, Vol. 607, No. 1, pp. 158-161, 2009. https://doi.org/10.1016/j.nima.2009.03.172
  9. Ji-Koon Park, In-Chan Yoon, Surim-Choi, et al, "Study on Improvement of Signal to Noise Ratio for $HgI_2$ Radiation Conversion Sensor Using Blocking layer", JKSR, Vol 5, No 2, pp. 97-101, 2011.
  10. Antonuk Larry E, Yocef El-Mohri, Adam Hall, et al, "97 ${\mu}m$ pitch, Indirect-Detection, Active Matrix, Flat-Panel Imager(AMFPI)", Proceeding of the SPIE Conf, Vol 3336, pp. 2-13, 1998.
  11. "Medical electrical equipment - Characteristics of digital X-ray imaging devices: Determination of the detective quantum efficiency, IEC 62220-1:2003", International Electro-technical Committee; IEC, 2003.

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