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Zhang X, Martin A, Jordan C, et al. Design of catheter radio frequency coils using coaxial transmission line resonators for interventional neurovascular MR imaging. Quant Imaging Med Surg. 2017;7(2):187-194doi: 10.21037/qims.2016.12.05.
Zhang, X., Martin, A., Jordan, C., Lillaney, P., Losey, A., Pang, Y., Hu, J., Wilson, M., Cooke, D., & Hetts, S. W. (2017). Design of catheter radio frequency coils using coaxial transmission line resonators for interventional neurovascular MR imaging. Quantitative imaging in medicine and surgery, 7(2), 187-194. https://doi.org/10.21037/qims.2016.12.05
Zhang, Xiaoliang, et al. "Design of catheter radio frequency coils using coaxial transmission line resonators for interventional neurovascular MR imaging." Quantitative imaging in medicine and surgery vol. 7,2 (2017): 187-194. doi: https://doi.org/10.21037/qims.2016.12.05
Zhang X, Martin A, Jordan C, Lillaney P, Losey A, Pang Y, Hu J, Wilson M, Cooke D, Hetts SW. Design of catheter radio frequency coils using coaxial transmission line resonators for interventional neurovascular MR imaging. Quant Imaging Med Surg. 2017 Apr;7(2):187-194. doi: 10.21037/qims.2016.12.05. PMID: 28516044; PMCID: PMC5418149.
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Quant Imaging Med Surg. 2017 Apr;7(2):187-194. doi: 10.21037/qims.2016.12.05.

Design of catheter radio frequency coils using coaxial transmission line resonators for interventional neurovascular MR imaging.

Quantitative imaging in medicine and surgery

Xiaoliang Zhang, Alastair Martin, Caroline Jordan, Prasheel Lillaney, Aaron Losey, Yong Pang, Jeffrey Hu, Mark Wilson, Daniel Cooke, Steven W Hetts

Affiliations

  1. Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA, USA.
  2. UC Berkeley/UCSF Joint Bioengineering Program, University of California, Berkeley, San Francisco, CA, USA.

PMID: 28516044 PMCID: PMC5418149 DOI: 10.21037/qims.2016.12.05

Abstract

BACKGROUND: It is technically challenging to design compact yet sensitive miniature catheter radio frequency (RF) coils for endovascular interventional MR imaging.

METHODS: In this work, a new design method for catheter RF coils is proposed based on the coaxial transmission line resonator (TLR) technique. Due to its distributed circuit, the TLR catheter coil does not need any lumped capacitors to support its resonance, which simplifies the practical design and construction and provides a straightforward technique for designing miniature catheter-mounted imaging coils that are appropriate for interventional neurovascular procedures. The outer conductor of the TLR serves as an RF shield, which prevents electromagnetic energy loss, and improves coil Q factors. It also minimizes interaction with surrounding tissues and signal losses along the catheter coil. To investigate the technique, a prototype catheter coil was built using the proposed coaxial TLR technique and evaluated with standard RF testing and measurement methods and MR imaging experiments. Numerical simulation was carried out to assess the RF electromagnetic field behavior of the proposed TLR catheter coil and the conventional lumped-element catheter coil.

RESULTS: The proposed TLR catheter coil was successfully tuned to 64 MHz for proton imaging at 1.5 T. B

CONCLUSIONS: Catheter imaging RF coil design using the proposed coaxial TLR technique is feasible and advantageous in endovascular interventional MR imaging applications.

Keywords: Interventional MR; MR sensitivity; RF coil; catheter coil; coaxial transmission line; endovascular imaging; transmission line resonator (TLR)

Conflict of interest statement

Conflicts of Interest: The authors have no conflicts of interest to declare.

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