The Study for Optimal Exposure Condition of Chest Examination of Digital Radiography System

디지털 방사선 촬영장치의 흉부촬영 최적 조사조건에 관한 연구

Park, Ji-Koon;Jung, Bong-Jae;Park, Hyong-Hu;Noh, Si-Cheol;Kang, Sang-Sik

  • Received : 2016.02.01
  • Accepted : 2016.02.29
  • Published : 2016.02.29


Despite of increasing the use of the digital imaging device in the radiology area, the setting on the optimal irradiation conditions are insufficient. In this study, the exposure dose and image quality by exposure condition of digital radiography device were compared. The exposure doses were obtained by adjusting the exposure condition as 5 steps respectively based on the exposure conditions that are currently used of CR and DR radiography devices. The acquired image has been assessed by 20 medical image professors using the assessment method of the Japanese Society for Tuberculosis Prevent. As a result, in the case of the CR system, the better image quality was obtained in the condition of 120 kVp and 1.5 mAs~2.4 mAs (quality score 91~95.5 points) than standard exposure condition(110 kVp, 3.2 mAs, 86 points). And exposure dose was evaluated as low with $61.3{\sim}98.4{\mu}Gy$ than standard condition($105.11{\mu}Gy$). In DR system, however, the image quality score was higher as 97~98.6 points in the lower tube voltage range (112 kVp, 2.4~3.2 mAs) condition than the standard exposure condition (125 kVp, 3.2 mAs, 91 points). In addition, the exposure dose was $61.5-77.2{\mu}Gy$ lower than standard condition($93{\mu}Gy$). In addition, the exposure dose was low as $61.5-77.2{\mu}Gy$ than standard condition($93{\mu}Gy$). With the results of this study, we confirmed that it is possible to reduce the patient exposure dose with the same image quality by adjusting the optimal exposure condition of digital device.


Digital Imaging system;Patient Dose;Image Quality;Tube Voltage;milli-ampere second


  1. S. C. Bushong, Radiologic science for tehcnologists ; Physics, Biology, and Protection, 10th Ed., Elsevier Publishing Co., pp.6, 2013.
  2. R. M. Harrison, "Digital Radiography", Phys. Med. Biol, Vol. 33, No. 7, pp. 751-784, 1988
  3. M. J. Yaffe, J. A. Rowlands, "X-ray detectors for digital radiography", Phys. Med. Biol, Vol. 42, pp. 139, 1997
  4. S. H. Jung, Y. S. Kim, Y. B, Kim, M. S. Yoon, S. H. Nam, J. K. Park, "The study of Pbo sintering effect for high efficiency x-ray detection sensor", Journal of the Korean Society of Radiology, Vol. 3, No. 3, pp. 37-41, 2009
  5. B. R. Pakr, D. W. Sung, "A comparative study of image quality and radiation dose with changes in tube voltage and current for digital chest radiography", Journal of Korean Society of Radiology, Vol. 2, No. 2, pp. 131-137, 2010
  6. J. L. Ecuyer, A. Mouton, A. Legros, A. Selmani, S. Degtorov, "Applications of selenium-based alloys for digital radiography", Nuclear Instruments and Methods in Physics Resarch A, Vol. 380, PP. 493-496, 1996
  7. Yasahiro sasagawa, "The report of medical exposures in diagnositc radiology(part2)", The journal of japan Association of Radiological Technologists, vol.44, No.11, 1997
  8. J. Heo, "Image quality control of Radiological diagnosis and chest X-ray of Cancer", Journal of Radiological Science and technology, Vol. 18, No. 2 pp. 15-25, 1995
  9. Y. A. Jang, H. S. Moon, H. Y. Lim, H. J. Oh, S. S. Kim, Y. I. Kim, "Comparison study of Chest Analog-digital chest image", Journal of the Korean society of digital imaging technology , Vol. 2, No. 1, pp. 74-82, 1996
  10. S. Reissberg, C. Hoeschen, R. Fiedler, "First clinical experience with a full-size flat panel detector for imaging the peripheral skeletal system", Medical Physics, Vol.33, No. 4, pp. 4169-4175, 2006
  11. K. Barcher, PO. Smeets, K. Bonnarens, A. D. Hauwere, H. Thierens, "Dose reduction in patients undergoing chest imaging", American Journal of Radiology1, pp. 923-929, 2003


Supported by : International University of Korea