Nineteen-channel receive array and four-channel transmit array coil for cervical spinal cord imaging at 7T

Magn Reson Med. 2014 Jul;72(1):291-300. doi: 10.1002/mrm.24911. Epub 2013 Aug 20.


Purpose: To design and validate a radiofrequency (RF) array coil for cervical spinal cord imaging at 7T.

Methods: A 19-channel receive array with a four-channel transmit array was developed on a close-fitting coil former at 7T. Transmit efficiency and specific absorption rate were evaluated in a B1 (+) mapping study and an electromagnetic model. Receive signal-to-noise ratio (SNR) and noise amplification for parallel imaging were evaluated and compared with a commercial 3T 19-channel head-neck array and a 7T four-channel spine array. The performance of the array was qualitatively demonstrated in human volunteers using high-resolution imaging (down to 300 μm in-plane).

Results: The transmit and receive arrays showed good bench performance. The SNR was approximately 4.2-fold higher in the 7T receive array at the location of the cord with respect to the 3T coil. The g-factor results showed an additional acceleration was possible with the 7T array. In vivo imaging was feasible and showed high SNR and tissue contrast.

Conclusion: The highly parallel transmit and receive arrays were demonstrated to be fit for spinal cord imaging at 7T. The high sensitivity of the receive coil combined with ultra-high field will likely improve investigations of microstructure and tissue segmentation in the healthy and pathological spinal cord.

Keywords: RF coil; cervical spinal cord MRI; high-field MRI; receive array; transmit array.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cervical Vertebrae*
  • Female
  • Humans
  • Image Enhancement / instrumentation
  • Magnetic Resonance Imaging / instrumentation*
  • Male
  • Radio Waves
  • Signal-To-Noise Ratio
  • Spinal Cord Diseases / diagnosis*