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Usefulness of the Technique of Collecting Signals by Selecting Elements from RF Receive Phase Array Coil in Magnetic Resonance Imaging

자기공명영상검사 시 Array coil에서 element를 선택하여 신호를 수집하는 기법의 유용성

  • 최관우 (서울아산병원 영상의학과) ;
  • 손순룡 (원광보건대학교 방사선과)
  • Received : 2018.02.06
  • Accepted : 2018.02.22
  • Published : 2018.06.28

Abstract

In this study, we investigated the signal intensity changes by activating all and partially selected coil elements as a way to increase the SNR in a single region MR imaging. Two cylindrical fluid phantoms were placed side by side in a phase array coil and MRI scans were repeated by turning on the entire elements and selected elements. As a result, on both of the T1 and T2 weighted images signal intensities were significantly increased by 5.49% and 14.64%, respectively. In conclusion, if only a single region was to be imaged, selecting appropriate elements and collecting signals only from them could easily improve image qualities and signal intensities.

Keywords

Array Coil;Element;Surface Coil;RF Receive Coil;Signal to Noise Ratio

Acknowledgement

Supported by : 원광보건대학교

References

  1. G. Shou, L. Xia, F. Liu, M. Zhu, Y. Li, and S. Crozier, "MRI coil design using boundaryelement method with regularization technique: A numerical calculation study," IEEE Transactions on Magnetics, Vol.46, No.4, pp.1052-1059, 2010. https://doi.org/10.1109/TMAG.2009.2037753
  2. H. Lee, 자기공명 영상과 분광법의 이해, 계명대학교출판부, 2016.
  3. M. A. Ohliger and D. K. Sodickson, "An introduction to coil array design for parallel MRI," NMR in Biomedicine, Vol.19, No.3, pp.300-315, 2006. https://doi.org/10.1002/nbm.1046
  4. 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
  5. D. M. Brian, A. B. Mark, and C. S. Richard, MRI basic principles and applications, John Wiley & Sons, 2015.
  6. 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
  7. D. K. Seo, S. 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
  8. 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
  9. 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
  10. 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
  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. D. H. Lee, C. Hong, M. W. Lee, and B. S. Han, "Signal intensity correction for multichannel MR images using radon transformation," International Journal of Imaging Systems and Technology, Vol.25, No.2, pp.148-152, 2015. https://doi.org/10.1002/ima.22131
  14. C. M. Collins, Q. X. Yang, J. H. Wang, X. Zhang, H. Liu, S. Michaeli, X. H. Zhu, G. Adriany, J. T. Vaughan, P. Anderson, H. Merkle, K. Ugurbil, M. B. Smith, and W. Chen, "Different excitation and reception distributions with a single-loop transmit- receive surface coil near a head-sized spherical phantom at 300 MHz," Magn Reson Med, Vol.47, No.5, pp.1026-1028, 2002. https://doi.org/10.1002/mrm.10153