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A shielded 32-channel body transceiver array with integrated electronics for 7 T.

Tobey D Haluptzok1, Russell L Lagore1, Simon Schmidt1

  • 1Center for Magnetic Resonance Research (CMRR), University of Minnesota, Minneapolis, Minnesota, USA.

Magnetic Resonance in Medicine
|March 31, 2025
PubMed
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A new 32-channel transceiver array for 7 Tesla body imaging offers improved signal-to-noise ratio (SNR) and reduced g-factors. This shielded array is robust to external loading, enhancing imaging quality for various organs.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Radiofrequency (RF) Coil Technology
  • High-Field Imaging (7T)

Background:

  • Advancements in high-field MRI (7T) require optimized radiofrequency (RF) coil arrays for superior image quality.
  • Existing coil designs face challenges with signal-to-noise ratio (SNR), g-factors, and susceptibility to external loading.

Purpose of the Study:

  • To develop a 32-channel transceiver array for 7T body imaging.
  • To incorporate an RF shield for improved SNR and reduced g-factors.
  • To ensure robustness against external loading effects.

Main Methods:

  • Investigated RF shielding on single resonant blocks (LD and 3LD configurations).
  • Constructed and validated an eight-block, 32-channel shielded array (32LD-SH) for in-vivo use.
Keywords:
7 TRF shieldUHF MRIbody imagingloop dipoletransceiver array

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  • Compared performance (SNR, parallel imaging, transmit efficiency) against a 16-channel array (16LD); assessed loading effects.

    • Main Results:

    • The 32LD-SH array demonstrated 30% higher central SNR and supported threefold acceleration compared to the 16LD array.
    • Peripheral SNR was 80% higher, and SNR at 10cm depth was 25% higher with 3LD blocks.
    • The 32LD-SH array showed robustness to external loading, unlike the 16LD array.

    Conclusions:

    • A 32-channel shielded transceiver array was successfully developed for 7T body imaging.
    • The array offers enhanced SNR and lower g-factors compared to a 16-channel array.
    • Despite reduced transmit efficiency, parallel transmit optimization enabled high-quality imaging of target organs.