The Journal of the Korea Contents Association (한국콘텐츠학회논문지)

The Korea Contents Association (한국콘텐츠학회)
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Analysis of Distances for MRI Scan to Maintain Pptimal Signal Intensity in a Surface Coil

MRI 검사 시 코일내 최적의 신호강도를 유지할 수 있는 거리의 기준 분석

  • 손순룡 (원광보건대학교 방사선과)
  • Received : 2018.07.11
  • Accepted : 2018.07.25
  • Published : 2018.10.28
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Abstract

The purpose of this study is to statistically analyze the signal intensity pattern according distance from the surface coil center and to maintain optimal signal intensity under clinical circumstances where the surface coil centers are not correctly positioned due to various causes. The cylindrical fluid phantom was placed and moved from the coil center in vertical direction with 1 cm increments. The signal intensities were measured and compared. As a result, the signal intensity showed no significant difference within 4 cm and 1 cm from in T1 weighted images while in T2 weighted images the signal intensity was maintained up to 5 cm and lower 3 cm in the upper and lower direction from the coil center. In conclusion, to maintain the optimal signal intensity the target region should be located within the reference distances proposed in this study.

본 연구는 다양한 원인에 의해 코일 중심에 목적 부위를 위치시킬 수 없을 경우 통계적으로 코일 중심과 신호강도가 동일한 기준 거리를 제시하여 최적의 신호강도를 유지할 수 있는 방안을 마련하고자 하였다. 연구방법은 원통형 fluid 팬텀을 코일 중심에서 상 하 방향으로 1 cm 씩 이동시켜 가면서 10 cm 까지 영상을 획득한 후, 신호강도를 측정하여 비교 평가하였다. 연구결과, T1 강조영상은 코일 중심에서 상방향 4 cm와 하방향 1 cm, T2 강조영상은 상방향 5 cm와 하방향 3 cm 이내일 경우 기준인 코일 중심의 신호강도와 유의한 차이가 없음을 알 수 있었다. 결론적으로 본 연구에서 제시한 기준 거리 이내로 영상화하려는 목적 부위를 위치시킨다면 최적의 신호강도를 유지할 수 있으리라 판단된다.

Keywords

References

  1. L. Axel, J. Costantini, and J. Listerud, "Intensity correction in surface-coil MR imaging," AJR Am J Roentgenol, Vol.148, No.2, pp.418-420, 1987. https://doi.org/10.2214/ajr.148.2.418
  2. K. R. Minard and R. A. Wind, "Solenoidal microcoil design I. Optimizing RF homogeneity and coil dimensions. Concepts," Magn Reson, Vol.13, pp.128-142, 2001.
  3. D. L. Olson, T. L. Peck, A. G. Webb, R. L. Magin, and J. V. Sweedler, "High resolution microcoil 1H-NMR for mass-limited, nanoliter volume samples," Science, Vol.270, pp.1967-1970, 1995. https://doi.org/10.1126/science.270.5244.1967
  4. R. Turner, "A target field approach to optimal coil design," Journal of physics D: Applied physics, Vol.19, No.8, p.147, 1986. https://doi.org/10.1088/0022-3727/19/1/019
  5. K. W. Choi and S. Y. Son, "Usefulness of the Technique of Collecting Signals by Selecting Elements from RF Receive Phase Array Coil in Magnetic Resonance Imaging," Journal of the Korea Contents Association, Vol.18, No.6, pp.461-466, 2018. https://doi.org/10.5392/JKCA.2018.18.06.461
  6. T. W. Redpath, "Signal-to-noise ratio in MRI," The British Journal of Radiology, Vol.71, pp.704-707, 1998. https://doi.org/10.1259/bjr.71.847.9771379
  7. E. Plenge, D. H. Poot, M. Bernsen, G. Kotek, G. Houston, P. Wielopolski, W. J. Niessen, and E. Meijering, "Super-resolution methods in MRI: can they improve the trade-off between resolution, signal-to-noise ratio, and acquisition time?," Magn Reson Med, Vol.68, No.6, pp.1983-1993, 2012. https://doi.org/10.1002/mrm.24187
  8. B. M. Dale, M. A. Brown, and R. C. Semelka, MRI: basic principles and applications, John Wiley & Sons, 2015.
  9. K. W. Choi and S. Y. Son, "A research on improving signal to noise ratio for magnetic resonance imaging through increasing filling factor inside surface coil," Journal of the Korea Academia-Industrial cooperation Society, Vol.13, No.11, pp.5299-5304, 2012. https://doi.org/10.5762/KAIS.2012.13.11.5299
  10. D. K. Seo, S. R. Na, J. H. Park, K. W. Choi, H. B. Lee, and D. K. Han, "Effectiveness of a silicone device for foot MRI in order to obtain homogeneous fat suppression images," Acta Radiologica, Vol.56, No.4, pp.471-476, 2015. https://doi.org/10.1177/0284185114531572
  11. T. J. Lawry, M. W. Weiner, and G. B. Matson, "Computer modeling of surface coil sensitivity," Magnetic resonance in medicine, Vol.16, No.2, pp.294-302, 1990. https://doi.org/10.1002/mrm.1910160210
  12. R. Buchli, M. Saner, D. Meier, E. B. Boskamp, and P. Boesiger, "Increased rf power absorption in MR imaging due to rf coupling between body coil and surface coil," Magn Reson Med, Vol.9, No.1, pp.105-112, 1989. https://doi.org/10.1002/mrm.1910090112
  13. C. H. Lim and S. J. Bae, "3T MR Spin Echo T1 Weighted Image at Optimization of Flip Angle," Radiologic Technology Proceedings of Korea, Vol.32, pp.177-182, 2009.
  14. S. Y. Park, J. S. Park, W. Jin, K. H. Rhyu, and K. N. Ryu, "Diagnosis of acetabular labral tears: comparison of three-dimensional intermediate-weighted fast spin-echo MR arthrography with two-dimensional MR arthrography at 3.0T," Acta Radiol, Vol.54, No.1, pp.75-82, 2013. https://doi.org/10.1258/ar.2012.120338
  15. T. Nakada, "Clinical application of high and ultra high-field MRI," Brain & Development, Vol.29, pp.325-335, 2007. https://doi.org/10.1016/j.braindev.2006.10.005
  16. B. J. Soher, B. M. Dale, and E. M. Merkle, "A Review of MR Physics: 3T versus 1.5T," Magn Reson imaging, Vol.15, pp.277-290, 2007. https://doi.org/10.1016/j.mric.2007.06.002
  17. 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. https://doi.org/10.5762/KAIS.2016.17.3.103
  18. 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