The Journal of the Korea Contents Association (한국콘텐츠학회논문지)

The Korea Contents Association (한국콘텐츠학회)
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Diffusion Weighted Imaging in Musculoskeletal MRI: Analysis on Optimal Number of Excitations Providing better Differentiation of Maglignant Tumor

악성종양의 감별진단을 위한 근골격의 확산강조영상 검사 시 최적의 여기횟수

  • 최관우 (서울아산병원 영상의학과)
  • Received : 2018.07.23
  • Accepted : 2018.08.09
  • Published : 2018.08.28
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Abstract

The purpose of this study was to determine the optimal number of excitations(NEX) of diffusion weighted imaging(DWI) which is clinically useful in patients with musculoskeletal diseases while the scan time is relatively long. In this study, 30 patients underwent knee MRI using diffusion weighted image sequence using b values targeted on the bone and muscle. The NEX were varied from 1 to 5 and the ADC values were measured and analyzed. As a result of the study, 4 NEX and 2 NEX showed an statistically identical effect with the existing NEX on the bone and muscle diffusion weighted images, respectively. Also, it proved that the scan time could be significantly reduced by 21.2 % and 59.6 % compared to the established NEX which meant the optimal NEX could replace the existing NEX. In conclusion, applying the optimal NEX on the musculoskeletal bone and soft tissue DWI could improve the problems caused by the long scan time.

본 연구에서는 근골격 확산강조영상 검사 시 검사시간이 긴 여기횟수의 문제점을 인지하고 이를 대체할 수 있는 최적의 여기횟수를 제시하여 이를 개선하고자 하였다. 연구방법은 무릎관절 MRI 검사를 받은 30명을 대상으로, 여기횟수를 1부터 5까지 사용하여 뼈와 근육의 확산강조영상을 획득한 다음 여기횟수의 변화에 따른 ADC value를 비교분석 하였다. 연구 결과 기존에 관행적으로 사용해왔던 여기횟수 5와 차이가 없는 최소 여기횟수는 뼈의 경우 4, 근육의 경우 2로 나타났다. 이는 기존 여기횟수의 검사시간에 비해 뼈는 21.2%, 근육은 59.6% 단축된 수치로, 위에 제시한 여기횟수를 적용하면 통계적으로 차이가 없어 검사시간을 단축시키면서 기존 여기횟수를 대체할 수 있음을 의미하는 것이다. 결론적으로 본 연구가 제시한 여기횟수를 근골격 확산강조영상 검사에 적용하면 검사시간의 증가로 인해 발생할 수 있는 문제점을 개선할 수 있다.

Keywords

References

  1. N. Bharwani and D. M. Koh, "Diffusionweighted imaging of the liver: an update," Cancer imaging, Vol.13, No.2, p.171, 2013. https://doi.org/10.1102/1470-7330.2013.0019
  2. N. H. Koo, H. B. Lee, K. W. Choi, S. Y. Son, and B. G. Yoo, "The Study on Signal to Noise Ratio of Single-Shot Turbo Spin Echo to Reduce Image Distortion in Brain Stem Diffusion MRI," Journal of the Korean Society of Radiology, Vol.10, No.4, pp.241-246, 2016. https://doi.org/10.7742/jksr.2016.10.4.241
  3. J. H. Koo, Y. C. Yoon, and J. H. Kim, "Diffusion-weighted and Dynamic Contrastenhanced MRI of Metastatic Bone Tumors: Correlation of the Apparent Diffusion Coefficient, Ktrans and ve values," Journal of the Korean Society of Magnetic Resonance in Medicine, Vol.18, No.1, pp.25-33, 2014. https://doi.org/10.13104/jksmrm.2014.18.1.25
  4. D. W. Park, "Advances in magnetic resonance technique for tumor imaging," Journal of the Korean Medical Association, Vol.58, No.6, pp.516-522, 2015. https://doi.org/10.5124/jkma.2015.58.6.516
  5. T. W. Redpath, "Signal-to-noise ratio in MRI," The British Journal of Radiology, Vol.71, No.847, pp.704-707, 1998. https://doi.org/10.1259/bjr.71.847.9771379
  6. K. W. Choi and S. Y. Son, "An effectiveness of multitransmit parallel technique on scan time reduction in hip joint MRI," Journal of the Korea Academia-Industrial cooperation Society, Vol.17, No.3, pp.103-108, 2016.
  7. S. Y. Son, K. W. Choi, K. J. Park, J. S. Lee, and B. G. Yoo, "A effectiveness of multi-transmit parallel technique on magnetic resonance imaging of FOV less than 26 cm," Journal of Radiological Science and Technology, Vol.38, No.4, pp.429-435, 2015. https://doi.org/10.17946/JRST.2015.38.4.13
  8. S. R. Na, K. W. Choi, N. H. Koo, B. G. Yoo, and S. Y. Son, "A Change of Apparent Diffusion Coefficient in Diffusion Weighted Imaging Applied with Rectangular FOV Technique," Journal of the Korean Society of Radiology, Vol.10, No.7, pp.545-550, 2016. https://doi.org/10.7742/jksr.2016.10.7.545
  9. E. M. Escobedo, J. C. Hunter, G. C. Zink-Brody, A. J. Wilson, S. D. Harrison, and D. J. Fisher, "Usefulness of turbo spin-echo MR imaging in the evaluation of meniscal tears: comparison with a conventional spin-echo sequence," American journal of roentgenology, Vol.167, No.5, pp.1223-1227, 1996. https://doi.org/10.2214/ajr.167.5.8911185
  10. H. K. Song, A. C. Wright, R. L. Wolf, and F. W. Wehrli, "Multislice double inversion pulse sequence for efficient black‐blood MRI," Magnetic Resonance in Medicine, Vol.47, No.3, pp.616-620, 2002. https://doi.org/10.1002/mrm.10094
  11. X. Golay, J. Gillen, P. C. Van Zijl, and P. B. Barker, "Scan time reduction in proton magnetic resonance spectroscopic imaging of the human brainm" Magnetic Resonance in Medicine, Vol.47, No.2, pp.384-387, 2002. https://doi.org/10.1002/mrm.10038
  12. J. S. Bauer, S. Banerjee, T. D. Henning, R. Krug, S. Majumdar, and T. M. Link, "Fast high-spatial-resolution MRI of the ankle with parallel imaging using GRAPPA at 3 T," American Journal of Roentgenology, Vol.189, No.1, pp.240-245, 2007. https://doi.org/10.2214/AJR.07.2066
  13. K. P. Pruessmann, M. Weiger, M. B. Scheidegger, and P. Boesiger, "SENSE: sensitivity encoding for fast MRI," Magnetic resonance in medicine, Vol.42, No.5, pp.952-962, 1999. https://doi.org/10.1002/(SICI)1522-2594(199911)42:5<952::AID-MRM16>3.0.CO;2-S
  14. H. Rahbar, S. C. Partridge, W. B. DeMartini, R. L. Gutierrez, S. Parsian, and C. D. Lehman, "Improved B1 homogeneity of 3 tesla breast MRI using dual‐source parallel radiofrequency excitation," Journal of Magnetic Resonance Imaging, Vol.35, No.5, pp.1222-1226, 2012. https://doi.org/10.1002/jmri.23571
  15. K. W. Choi, H. B. Lee, S. R. Na, B. G. Yoo, and S. Y. Son, "The Study on Reduction of Image Distortion by using Single-Shot Turbo Spin Echo in Brain Stem Diffusion MRI," Journal of the Korean Society of Radiology, Vol.10, pp.279-284, 2016. https://doi.org/10.7742/jksr.2016.10.4.279