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


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.


Supported by : 원광보건대학교


  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.
  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.
  4. R. Turner, "A target field approach to optimal coil design," Journal of physics D: Applied physics, Vol.19, No.8, p.147, 1986.
  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.
  6. T. W. Redpath, "Signal-to-noise ratio in MRI," The British Journal of Radiology, Vol.71, pp.704-707, 1998.
  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.
  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.
  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.
  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.
  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.
  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.
  15. T. Nakada, "Clinical application of high and ultra high-field MRI," Brain & Development, Vol.29, pp.325-335, 2007.
  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.
  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.
  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.