한국콘텐츠학회논문지 (The Journal of the Korea Contents Association)

  • 제19권8호
  • /
  • Pages.284-292
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  • 2019
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  • 1598-4877(pISSN)
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  • 2508-6723(eISSN)
한국콘텐츠학회 (The Korea Contents Association)
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소아 흉부 CT 검사에서 관전압 80 kVp 조건으로 스캔 모드별 방사선량 감소와 화질 평가

The Evaluation of Dose Reduction and Quality of Images According to 80 kVp of Scan Mode Change in Pediatric Chest CT

  • 김구 (양산부산대학교병원 영상의학과) ;
  • 김경립 (양산부산대학교병원 감마나이프센터) ;
  • 이은숙 (부산대학교병원보건의료정보팀) ;
  • 조희정 (부산과학기술대학교의무행정과) ;
  • 성순기 (양산부산대학교병원 감마나이프센터) ;
  • 문슬지아 (전남대학교병원 영상의학과) ;
  • 곽종혁 (양산부산대학교병원 영상의학과)
  • 투고 : 2019.06.03
  • 심사 : 2019.08.20
  • 발행 : 2019.08.28
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초록

소아 흉부 CT 검사 시 방사선 피폭을 최소화 하면서 진단적으로 가치가 높은 영상을 얻기 위해서 Helical mode, High-pitch mode, Volume Axial mode를 적용하여서 선량, 검사시간, 화질을 비교하여 유용성을 평가하고자 한다. Revolution(GE Healthcare, Wisconsin USA)을 이용하여 PBU-70팬텀을 Helical mode, High-pitch mode, Volume Axial mode로 각각의 그룹으로 나누어서 관전압 80kVp, 조건으로 30회 검사를 실시하였다. 영상을 획득 한 후에 각각의 영상에 심장(Heart), 뼈(Bone), 폐(Lung), Back-ground air에 ROI를 설정하고 CT number(HU)와 noise(SD)값을 측정하여 평균값을 구하고 SNR과 CNR을 측정하였고, 장비에서 직접 제공하는 DLP값 비교하였다. 통계적인 유의성을 확인해보기 통계 분석은 SPSS 21.0을 사용하여 ONE-WAY-ANAOVA를 시행하였다. 본 실험을 통해 검사 시 volume axial mode 사용 시 가장 적은 선량으로 영상의 화질 저하 없이 빠른 시간에 검사가 가능하였다. 16cm의 detector coverage 가 모든 소아 흉부 CT검사에 적용하기에 제한점이 있으나 가능한 소아환자에 있어 적극적인 활용을 추천하며 volume axial mode의 다른 검사부위 적용에 대한 지속적인 연구가 필요하리라 사료된다.

To evaluate the usefulness of pediatric chest CT scans by comparing the dose, examination time, and image quality by applying Helical mode, High-pitch mode, and Volume Axial mode to minimize the radiation exposure and obtain high diagnostic value. Revolution (GE Healthcare, Wisconsin USA) was used to divide PBU-70 phantom into Helical mode, High-pitch mode, and Volume Axial mode. After acquiring images, ROI is set for each image, heart, bone, lung, and back-ground air, and the average value is obtained by measuring CT number (HU) and noise (SD). SNR and CNR were measured and compared with DLP values provided directly by the equipment. Determining statistical significance Statistical analysis was performed using ONE-WAY-ANAOVA using SPSS 21.0. In this experiment, it was possible to inspect at a short time without deterioration of image quality with the lowest dose when using volume axial mode. Although the detector coverage of 16 cm is limited to all pediatric chest CT scans, it is recommended to be actively used in pediatric patients, and further study is needed to apply other test sites in volume axial mode.

키워드

참고문헌

  1. Ling Liu, Raymond Poon, Li Chen, Anna-Maria Frescura, Paolo Montuschi, Giovanni Ciabattoni, Amanda Wheeler, and Robert Dales, Acute effects of air pollution on pulmonary function, airway inflammation, and oxidative stress in asthmatic children, Environ Health Perspect No.117, pp.668-674, 2009.
  2. B. A. Alhanti, H. H. Chang, A. Winquist, J. A. Mulholland, L. A. Darrow, and S. E. Sarnat, "Ambient air pollution and emergency department visits for asthma: a multi-city assessment of effect modification by age," J Expo Sci Environ Epidemiol, No.26, pp.180-188, 2016.
  3. Y. Yoo, J. T. Choung, J. Yu, D. K. Kim, and Y. Y. Koh, "Acute effects of Asian dust events on respiratory symptoms and peak expiratory flow in children with mild asthma," J Korean Med Sci, No.23, pp.66-71, 2008.
  4. S. Zhang, G. Li, L. Tian, Q. Guo, and X. Pan, "Short-term exposure to air pollution and morbidity of COPD and asthma in East Asian area: a systematic review and meta-analysis," Environ Res, No.148, pp.15-23, 2016.
  5. D. Brenner, C. Elliston, E. Hall, and W. Bredon, "Estimated risks of radiation-induced fatal cancer from pediatric CT," AJR Am J Roentgenol, No.176, pp.289-296, 2001.
  6. E. L. Nickoloff and P. O. Alderson, "Radiation exposures to patients from CT: reality, public perception, and policy," AJR Am J Roentgenol, No.177, pp.285-287, 2001.
  7. A. S. Brody, D. P. Frush, W. Huda, and R. L. Brent, "American Academy of Pediatrics Section on Radiology. Radiation risk to children from computed tomography," Pediatrics, No.120, pp.677-682, 2007.
  8. S. E. Jeong and D. U. Seong, Development of guidelines for justification process and optimization of clinical protocol in radiation exposure from CT scan: NDSL, National Digital Science Library, 2011.
  9. National Research Council (US), Committee to Assess Health Risks from Exposure to Low Levels of Ionizing Radiation. Health risks from exposure to low levels of ionizing radiation: BEIR VII phase 2, Washington DC: National Academies Press, 2006.
  10. Health Insurance Review & Assessment Service, 2005 National health insurance statistical yearbook, Seoul: Health Insurance Review & Assessment Service, 2006.
  11. C. M. Heyer, P. S. Mohr, S. P. Lemburg, S. A. Peters, and V. Nicolas, "Image quality and radiation exposure at pulmonary CT angiography with 100- or 120-kVp protocol: Prospective radiomized study," Radiology, Vol.245, No.2, pp.577-583, 2007. https://doi.org/10.1148/radiol.2452061919
  12. S. Yoshinaga, K. Mabuchi, A. J. Sigurdson, M. M. Doody, and E. Ron, "Cancer risks among radiologists and radiologic technologists review of epidemiologic studies," Radiology, Vol.233, No.2, pp.313-321, 2004. https://doi.org/10.1148/radiol.2332031119
  13. ICRP, 1990 Recommendations of the International Commission on Radiological Protection, ICRP Publication 60, 1991. Annex C Bases for judging the significance of the effects of radiation
  14. F. A. Mettler Jr, "CT scanning: patterns of use and dose," J Radiol Prot, Vol.20, No.4, pp.353-359, 2000. https://doi.org/10.1088/0952-4746/20/4/301
  15. J. Broder, L. A. Fordham, and D. M. Warshauer, "Increasing utilization of computed tomography in the pediatric emergency department, 2000-2006," Emergency Radiol, Vol.14, No.4, pp.277-232, 2007.
  16. J. H. Johnston, D. J. Podberesky, T. T. Yoshizumi, E. Angel, G. Toncheva, D. B. Larson, J. C. Egelhoff, C. Anderson-Evans, G. B. Nguyen, A. Barelli, C. Alsip, S. R. Salisbury, and D. P. Frush, "Comparison of radiation dose estimates, image noise, and scan duration in pediatric body imaging for volumetric and helical modes on 320-detector CT and helical mode on 64-detector CT," Pediatric radiology, Vol.43, No.9, pp.1117-1127, 2013. https://doi.org/10.1007/s00247-013-2690-5
  17. Y. J. Ryu, W. S. Kim, Y. H. Choi, J. E. Cheon, S. M. Lee, H. H. Cho, and I. O. Kim, "Pediatric chest CT: wide-volume and helical scan modes in 320-MDCT," American Journal of Roentgenology, Vol.205, No.6, pp.1315-1321, 2015. https://doi.org/10.2214/AJR.14.13941
  18. D. J. Podberesky, E. Angel, and T. T. Yoshizumi, "Comparison of radiation dose estimates and scan performance in pediatric high-resolution thoracic CT for volumetric 320-detector row, helical 64-detector row, and noncontiguous axial scan acquisitions," Acad Radiol, No.20, pp.1152-1161, 2013.
  19. D. D. Cody and M. Mahesh, "Technologic advances in multi detector CT with a focus on cardiac imaging," Radio Graphics, No.27, pp.1829-1837, 2007.
  20. A. Sodickson and M. Weiss, "Effects of patient size on radiation dose reduction and image quality in low-kVp CT pulmonary angiography performed with reduced IV contrast dose," Emergency radiology, Vol.19, No.5, pp.437-445, 2012. https://doi.org/10.1007/s10140-012-1046-z