Accelerating the co-simulation method for the design of transmit array coils for MRI

Alireza Sadeghi-Tarakameh, Ehsan Kazemivalipour, Umut Gundogdu, Serhat Erdogan, Ergin Atalar

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Objective: Accelerating the co-simulation method for the design of transmit array (TxArray) coils is studied using equivalent circuit models. Materials and methods: Although the co-simulation method dramatically reduces the complexity of the design of TxArray coils, finding the optimum solution is not trivial since there exist many local minima in the optimization problem. We propose to utilize an equivalent circuit model of the TxArray coil to obtain a proper initial guess for the optimization process of the co-simulation method. To prove the concept, six different TxArray coils (i.e., three degenerate birdcage coils (DBC), two dual-row head coils, and one elliptical body TxArray coil) with two different loading strategies (cylindrical phantom and human head/body model) at 3 T field strength are investigated theoretically; as an example study, an eight-channel head-DBC is constructed using the obtained values. Results: This approach accelerates the design process more than 20-fold for the coils that are investigated in this manuscript. Conclusion: A fast and accurate method for tuning and decoupling of a TxArray coil can be achieved using its equivalent circuit model combined with the co-simulation method.

Original languageEnglish (US)
Pages (from-to)165-178
Number of pages14
JournalMagnetic Resonance Materials in Physics, Biology and Medicine
Volume34
Issue number1
DOIs
StatePublished - Feb 2021
Externally publishedYes

Bibliographical note

Funding Information:
This project was supported by ASELSAN A.S. Ankara, Turkey. MREPT experiments were performed by the aid of Mr. Safa Ozdemir using the facilities of UMRAM, Bilkent University, Ankara, Turkey.

Publisher Copyright:
© 2020, European Society for Magnetic Resonance in Medicine and Biology (ESMRMB).

Keywords

  • Co-simulation
  • Equivalent circuit model
  • Inductor calculations
  • MRI
  • Transmit array

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