Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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A Study on Various Automatic Exposure Control System in Multi-Detector Computed Tomography by Using Human Phantom

인체 모형을 이용한 다중 검출기 컴퓨터단층촬영기기의 다양한 자동노출제어 시스템에 대한 연구

  • Kim, Yong-Ok (Department of Radiology, Seoul National University Bundang Hospital) ;
  • Seoung, Youl-Hun (Department of Radiological Science, Cheongju University)
  • 김영옥 (분당서울대학교병원 영상의학과) ;
  • 성열훈 (청주대학교 방사선학과)
  • Received : 2012.01.31
  • Accepted : 2012.04.12
  • Published : 2012.04.30
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Abstract

The purpose of the study was to evaluation of the radiation dose reduction and the possibility of the maintainability of the adequate image quality using various automatic exposure control (AEC) systems in multi-detector computed tomography (MDCT). We used three AEC systems for the study: General Electric Healthcare (Auto-mA 3D), Philips Medical systems (DoseRight) and Siemens Medical Solutions (Care Dose 4D). The general scanning protocol was created for the each examination with the same scanning parameters as many as possible. In the various AEC systems, the evaluation of reduced-dose was evaluated by comparing to fixed mAs with using human phantom. The image quality of the phantom was evaluated with measuring the image noise (standard deviation) by insert regions of interests. Finally, when we applied to AEC for three manufacturers, the radiation dose reduction decreased each 35.3% in the Auto-mA 3D, 58.2% in the DoseRight, and 48.6% in the Care Dose 4D. And, there was not statistical significant difference among the image quality in the Strong/Weak of the Care Dose 4D(P=.269). This applies to variety of the AEC systems which will be very useful to reduce the dose and to maintain the high quality.

다중 검출기 컴퓨터단층촬영(multi-detector computed tomography; MDCT) 장비에서 이용되는 다양한 자동노출제어(automatic exposure control; AEC) 시스템에 대한 선량 감소 정도와 영상의 품질을 비교 평가하였다. 연구에 이용한 AEC 시스템은 General Electric(GE)사의 Auto-mA 3D, Philips사의 DoseRight, 그리고 Siemens사의 Care Dose 4D를 이용하였다. 모든 실험에서 X-선 노출 조건을 가능한 한 동일하게 하였다. 다양한 AEC 시스템에서 선량 감소 평가는 인체 모형을 이용하여 고정관류기법과 비교하여 평가하였다. 또한 영상 품질은 CT 계수(number)의 표준 편차를 이용하여 영상의 잡음을 측정하였다. 그 결과 AEC 시스템을 적용할 때 Auto-mA 3D는 35.3%, DoseRight는 58.2%, Care Dose 4D는 48.6%의 최대 선량감소가 있었으며, 영상품질에서는 Care Dose 4D의 강함/약함 (Strong/Weak)의 조합에서 유의한 차이가 없었다(P=0.269). 이런 다양한 AEC 시스템의 적용은 고품질의 영상을 유지하면서 선량을 감소하는데 매우 유용 할 것이라고 사료된다.

Keywords

References

  1. Dawson, P. "Patient dose in multi-slice CT: Why is it increasing and does it matter?", Br J Radiol, 77, pp. S10-13, 2004. https://doi.org/10.1259/bjr/23162044
  2. Yates, S. J. Pike, L. C. and Goldstone, K. E. "Effect of multi-slice scanners on patient dose from routine CT examination in East Anglia", Br J Radiol, 77, pp. 472-478, 2004. https://doi.org/10.1259/bjr/21927258
  3. Namasivayama, S. Kalraa, M. K. Pottalaa, K. M. and et al. "Optimization of Z-Axis Automatic Exposure Control for Multi-detector Row CT Evaluation of Neck and Comparison with Fixed Tube Current Technique for Image Quality and Radiation Dose", Am J Neuroradiol, 27, pp. 2221-2225, 2008.
  4. Nicholas, K. "report 05016: CT canner automatic exposure control systems", MHRA, 2005.
  5. Lewis, M. Keat, N. and Edyvean, S. "Report 06013: 32 to 64 slice CT scanner comparison report version 14", London, England ImPACT, 2006.
  6. Rizzo, S. Kalra, M. Schmidt, B. and et al "Comparison of angular and combined automatic tube current modulation techniques with constant tube current CT of the abdomen and pelvis", Am J Roentgenol, 186, pp. 673-79, 2006. https://doi.org/10.2214/AJR.04.1513
  7. Kalra, M. K. Naz, N. Rizzo, S. M. and Blake, M. A. "Computed Tomography Radiation Dose optimization: Scanning Protocols and Clinical Applications of Automatic Exposure Control", Curr Probl Diagn Radiol, 34, pp. 171-181, 2005. https://doi.org/10.1067/j.cpradiol.2005.06.002
  8. Gutierrez, D. Schmidt, S. Denys, A. and et al CT-automatic exposure control devices: What are their performances?", Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 580, pp. 990-995, 2007. https://doi.org/10.1016/j.nima.2007.06.117
  9. McCollough, C. H. Bruesewitz, M. R. and Kofler, J. M. "CT dose reduction and dose management tools: overview of available options", Radiographics, 26, pp. 503-512, 2006. https://doi.org/10.1148/rg.262055138
  10. Tsapaki, V. Aldrich, J. E. Sharma, R. and et al "Dose reduction in CT while maintaining diagnostic confidence: diagnostic reference levels at routine head, chest, and abdominal CT-IAEA-coordinated research project", Radiol, 240(3), pp. 828-834, 2006. https://doi.org/10.1148/radiol.2403050993
  11. IEC, "Medical Electrical Equipment. Part 2-44: Particular requirements for the safety of x-ray equipment for computed tomography", IEC publication No. 60601-2-44. Ed. 2.1. International Electrotechnical Commission (IEC) Central Office, Geneva, Switzerland, 2002.
  12. EC, European Commission. "European guidelines on quality criteria for computed tomography", Report EUR 16262 EN. Office for Official Publications of the European Communities, Luxembourg, 2000.
  13. American Association of Physicists in Medicine (AAPM) Report No 96. The Measurement, Reporting, and Management of Radiation Dose in CT. New York: AAPM, 2008.
  14. Kalra, M. K. Maher, M. M. Toth, T. L. and et al. "Strategies for CT radiation dose optimization", Radiology, 230, pp. 619-628, 2004. https://doi.org/10.1148/radiol.2303021726
  15. Söderberg, M. and Gunnarsson, M. "Automatic exposure control in computed tomography an evaluation of systems from different manu-facturers. Acta Radiologica, 6, pp. 625-634, 2010.
  16. Mulkens, T. H. Bellinck, P. Baeyaert, M. and et al "Use of an automatic exposure control mechanism for dose optimization in multi- detector row CT examinations: clinical evaluation", Radiol, 237, pp. 213-223, 2005. https://doi.org/10.1148/radiol.2363041220

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