Automated tuning of an eight-channel cardiac transceive array at 7 Tesla using piezoelectric actuators

Graeme A. Keith, Christopher T. Rodgers, Aaron T. Hess, Carl J. Snyder, J. Thomas Vaughan, Matthew D. Robson

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Purpose Ultra-high field (UHF) MR scanning in the body requires novel coil designs due to B1 field inhomogeneities. In the transverse electromagnetic field (TEM) design, maximum B1 transmit power can only be achieved if each individual transmit element is tuned and matched for different coil loads, which requires a considerable amount of valuable scanner time. Methods An integrated system for autotuning a multichannel parallel transmit (pTx) cardiac TEM array was devised, using piezoelectric actuators, power monitoring equipment and control software. The reproducibility and performance of the system were tested and the power responses of the coil elements were profiled. An automated optimization method was devised and evaluated. Results The time required to tune an eight-element pTx cardiac RF array was reduced from a mean of 30 min to less than 10 min with the use of this system. Conclusion Piezoelectric actuators are an attractive means of tuning RF coil arrays to yield more efficient B1 transmission into the subject. An automated mechanism for tuning these elements provides a practical solution for cardiac imaging at UHF, bringing this technology closer to clinical use. Magn Reson Med 73:2390-2397, 2015.

Original languageEnglish (US)
Pages (from-to)2390-2397
Number of pages8
JournalMagnetic resonance in medicine
Volume73
Issue number6
DOIs
StatePublished - Jun 1 2015

Bibliographical note

Publisher Copyright:
© 2014 The Authors.

Keywords

  • 7 Tesla
  • RF coil
  • parallel transmit
  • piezo-actuator
  • tuning
  • ultra-high field

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