Circuitry Design and Magnetic Susceptibility Evaluation of 7T fMRI Implantable RF Coil

Authors

  • Rong Wang Department of Electrical and Electronic Engineering The University of Hong Kong, City, Pokfulam Road, Hong Kong
  • Celia M. Dong Department of Electrical and Electronic Engineering The University of Hong Kong, City, Pokfulam Road, Hong Kong
  • Ed X. Wu Department of Electrical and Electronic Engineering The University of Hong Kong, City, Pokfulam Road, Hong Kong
  • Robert C. Roberts Department of Electrical and Electronic Engineering The University of Hong Kong, City, Pokfulam Road, Hong Kong
  • Li Jun Jiang Department of Electrical and Electronic Engineering The University of Hong Kong, City, Pokfulam Road, Hong Kong

Keywords:

fMRI, implantable coil, magnetic susceptibility

Abstract

Implantable coils have been widely utilized in functional magnetic resonance imaging (fMRI) owing to their superior signal to noise ratio. To effectively minimize the magnetic field distortion and image artifacts, the magnetic susceptibility of the implantable coil needs to be evaluated before practical use. In this work, we experimentally identify the magnetic susceptibility of each component of the implantable coil with the 7T Bruker NMR imaging scanner and provide useful guidelines for the following manufacturing. A 5 x 5 mm2 implantable surface coil with a tunable frequency range is subsequently introduced for the 7T fMRI of the rat primary somatosensory cortex (S1FL). A detachable external tuning circuit for the implantable coil is employed to facilitate in-vivo measurements in the rat model.

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References

C. Massin, G. Boero, F. Vincent, J. Abenhaim, P-A. Besse, and R. S. Popovic, “High-Q factor RF planar microcoils for micro-scale NMR spectroscopy,” Sens. Actuators, A, vol. 97, pp. 280- 288, Apr. 2002.

S. Eroglu, B.Gimi, B. Roman, G. Friedman, and R. L. Magin, “NMR spiral surface microcoils: Design, fabrication, and imaging,” Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering, vol. 1, pp. 1-10, Apr. 2003.

L. Renaud, M. Armenean, L. Berry, P. Kleimann, P. Morin, M. Pitaval, J. OBrien, M. Brunet, and H. Saint-Jalmes, “Implantable planar RF microcoils for NMR microspectroscopy,” Sens. Actuators, A, vol. 99, pp. 244-248, June 2002.

M. Bilgen, I. Elshafiey, and P. A. Narayana, “In vivo magnetic resonance microscopy of rat spinal cord at 7T using implantable RF coils,” Magn. Reson. Med., vol. 46, pp. 1250-1253, Nov. 2001.

S. Wood and T. S. Ibrahim, “Design and fabrication of a realistic anthropomorphic heterogeneous head phantom for MR purposes,” PloS One, vol. 12, pp. 0183168, Aug. 2017.

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Published

2021-07-22

How to Cite

[1]
Rong Wang, Celia M. Dong, Ed X. Wu, Robert C. Roberts, and Li Jun Jiang, “Circuitry Design and Magnetic Susceptibility Evaluation of 7T fMRI Implantable RF Coil”, ACES Journal, vol. 33, no. 10, pp. 1109–1111, Jul. 2021.

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General Submission