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흉부 및 복부에서 AEC 적용에 따른 MDCT의 선량 감소 효과

Radiation Dose Reducing Effect during the AEC System in the Chest and Abdomen of the MDCT Scanning

  • 발행 : 2009.03.28

초록

CT검사에 따른 방사선 선량의 유해성에 대한 관심이 고조되고 있어, 고정관전류기법과 AEC(automatic exposure control)를 적용하여 선량의 감소 효과를 비교하였다. 64MDCT를 이용하여 인체조직등가물질 팬텀으로 흉부 및 복부 부위를 고정관전류기법과 AEC를 적용하여 CTDIvol과 DLP를 비교하였고, 영상의 평가는 관심영역으로 CT감약계수와 노이즈를 측정하여 비교하였다. 흉부에서 고정관전류기법과 AEC적용에 따른 선량감소 효과는 CTDIvol 35.2%, DLP 49.3%, 복부에서는 CTDIvol 5.9%, DLP 3.2% 감소 효과가 있었다. CT검사에서 자동노출장치인 AEC를 이용하여 선량의 감소효과가 있다. CT 검사에 따른 환자의 피폭선량을 줄이기 위해서는 AEC를 이용하여야 한다.

The purpose of the current study was to compare radiation dose of 64MDCT performed with automatic exposure control (AEC) with manual selection fixed tube current. We evaluated the CT scans of phantom of the chest and abdomen using the fixed tube current and AEC technique. Objective image noise shown as the standard deviation of CT value in Hounsfield units was measured on the obtained images. Compared with fixed tube current, AEC resulted in reduction of the chest and abdomen in the CTDIvol (35.2%, 5.9%) and DLP (49.3%, 3.2%). Compared with manually selected fixed tube current, AEC resulted in reduced radiation dose at MDCT study of chest and abdomen.

키워드

참고문헌

  1. B. G. Yoo, D. C. Kweon, J. S. Lee, K. J. Jang, S. H. Jeon, and Y. S. Kim, "Comparison radiation dose of Z-axis automatic tube current modulation technique with fixed tube current multi-detector row CT scanning of lower extremity venography," J Radiat Prot, Vol.32, No.3, pp.123-133, 2007.
  2. M. K. Kalra, M. M. Maher, T. L. Toth, R. S. Kamath, E. F. Halpern, and S. Saini, "Comparison of Z-axis automatic tube current modulation technique with fixed tube current CT scanning of abdomen and pelvis," Radiology, Vol.232, No.2, pp.347-353, 2004. https://doi.org/10.1148/radiol.2322031304
  3. V. Tsapaki, J. E. Aldrich, R. Sharma, M. A. Staniszewska, A. Krisanachinda, M. Rehani, A. Hufton, C. Triantopoulou, P. N. Maniatis, J. Papailiou, and M. Prokop, "Dose reduction in CT while maintaining diagnostic confidence: diagnostic reference levels at routine head, chest, and abdominal CT-IAEA-coordinated research project," Radiology, Vol.240, No.3, pp.828-834, 2006. https://doi.org/10.1148/radiol.2403050993
  4. T. H. Mulkens, P.Bellinck, M. Baeyaert, D. Ghysen, X. Van Dijck, E. Mussen, C. Venstermans, and J. L. Termote, "Use of an automatic exposure control mechanism for dose optimization in multi-detector row CT examinations: clinical evaluation," Radiology, Vol.237, No.1, pp.213-233, 2005. https://doi.org/10.1148/radiol.2363041220
  5. M. K. Kalra, M. M. Maher, T. L. Toth, "Strategies for CT radiation dose optimization," Radiology, Vol.230, pp.619-628, 2004. https://doi.org/10.1148/radiol.2303021726
  6. M. K. Kalra, S. Rizzo, M. M. Maher, E. F. Halpen, T. L. Toth, J. A. Shepard, and S. L. Aquino, "Chest CT performed with Z-axis modulation: scanning protocol and radiation dose," Radiology, Vol.237, pp.303-308, 2005. https://doi.org/10.1148/radiol.2371041227
  7. S. Namasivayam, M. K. Kalra, K. M. Pottala, S. M. Waldrop, and P. A. Hudgins, "Optimization of Z-axis automatic exposure control for multidetector row CT evaluation of neck and comparison with fixed tube current technique for image quality and radiation dose," AJNR Am J Neuroradiol, Vol.27, pp.2221-2225, 2006.
  8. M. K. Kalra, M. M. Maher, R. S. Kamath, T. Horiuchi, T. L. Toth, E. F. Halpern, and S. Saini, "Sixteen-detector row CT of abdomen and pelvis: study for optimization of Z-axis modulation technique performed in 153 patients," Radiology, Vol.233, No.1, pp.214-219, 2004.
  9. I. Mastora, M. Remy-Jardin, V. Delannoy, A. Duhamel, C. Scherf, C. Suess, and J. Remy, "Multi-detector row spiral CT angiography of the thoracic outlet: dose reduction with anatomically adapted online tube current modulation and preset dose savings," Radiology, Vol.230, No.1. pp.116-124, 2004.
  10. T. H. Mulkens, S. Daineffe, R. De Wijngaert, P. Bellinck, A. Leonard, G. Smet, and J. L. Termote, "Urinary stone disease: comparison of standard-dose and low-dose with 4D MDCT tube current modulation," AJR Am J Roentgenol, Vol.188, No.2. pp.553-562, 2007. https://doi.org/10.2214/AJR.05.1863
  11. C. H. McCollough, M.R. Bruesewitz, and J. M. Kofler Jr, "CT dose reduction and dose management tools: overview of available options," RadioGraphics, Vol.26, No.2, pp.503-512, 2006. https://doi.org/10.1148/rg.262055138
  12. C. Coursey, D. P. Frush, T. Yoshizumi, G. Toncheva, G. Nguyen, and S. B. Greenberg, "Pediatric chest MDCT using tube current modulation: effect on radiation dose with breast shielding," Am. J. Roentgenol, Vol.190, No.1, pp.W54-W61, 2008. https://doi.org/10.2214/AJR.07.2017

피인용 문헌

  1. Dose assessment according to Differences in the Content of Iodine in Contrast Media used in Interventional Procedure vol.14, pp.3, 2014, https://doi.org/10.5392/JKCA.2014.14.03.337