Double-tuned 31P/1H human head array with high performance at both frequencies for spectroscopic imaging at 9.4T

Nikolai I. Avdievich, Loreen Ruhm, Johanna Dorst, Klaus Scheffler, Andreas Korzowski, Anke Henning

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Purpose: To develop a robust design of a human head double-tuned 31P/1H array, which provides good performance at both 31P and 1H frequencies for MR spectroscopic imaging at 9.4T. Methods: Increasing the number of surface loops in a human head array improves the peripheral signal-to-noise ratio (SNR), while the central SNR doesn’t substantially change. High peripheral SNR can contaminate MR spectroscopic imaging data at both 1H and 31P frequency. To minimize this effect, we limited the number of elements in the 31P array to 10, i.e., 8 transceiver surface loops circumscribing the head and 2 receive “vertical” loops placed at the superior location. The 1H-portion of the array also consists of 10 elements, i.e., 8 transceiver surface loops circumscribing the head and 2 transceiver “vertical” loops at the superior location of the head. Both the 31P array and 1H array are placed in a single layer at the same distance to the head, which provides high loading and, thus, a good performance for both arrays. Results: Transmit efficiency of the 1H-portion of the double-tuned array was very similar to that of the single-tuned arrays of similar size. Also, addition of the cross-loops substantially improved the brain coverage. Conclusion: We developed a novel 31P/1H double-tuned array for MR spectroscopic imaging of a human brain at 9.4T. Placing both 31P and 1H loops in a single layer provides for high transmit efficiency at both frequencies without compromising SNR near the brain center at the 31P-frequency. Addition of the cross-loops at the superior location improves the brain coverage.

Original languageEnglish (US)
Pages (from-to)1076-1089
Number of pages14
JournalMagnetic resonance in medicine
Volume84
Issue number2
DOIs
StatePublished - Aug 1 2020

Keywords

  • MRSI
  • RF human head coil
  • central SNR
  • double-tuned arrays
  • ultra-high field MRI

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

Fingerprint Dive into the research topics of 'Double-tuned <sup>31</sup>P/<sup>1</sup>H human head array with high performance at both frequencies for spectroscopic imaging at 9.4T'. Together they form a unique fingerprint.

  • Cite this