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Article Dans Une Revue Journal of Magnetic Resonance Année : 2018

A flexible 12-channel transceiver array of transmission line resonators for 7 T MRI

A flexible 12-channel transceiver array of transmission line resonators for 7 T MRI.

Sajad Hosseinnezhadian
  • Fonction : Auteur
Roberta Frass-Kriegl
  • Fonction : Auteur
Sigrun Goluch-Roat
  • Fonction : Auteur
Michael Pichler
  • Fonction : Auteur
Jürgen Sieg
  • Fonction : Auteur
Martin Vít
  • Fonction : Auteur
Ewald Moser
  • Fonction : Auteur
Elmar Laistler
  • Fonction : Auteur

Résumé

A flexible transceiver array based on transmission line resonators (TLRs) combining the advantages of coil arrays with the possibility of form-fitting targeting cardiac MRI at 7 T is presented. The design contains 12 elements which are fabricated on a flexible substrate with rigid PCBs attached on the center of each element to place the interface components, i.e. transmit/receive (T/R) switch, power splitter, pre-amplifier and capacitive tuning/matching circuitry. The mutual coupling between elements is cancelled using a decoupling ring-based technique. The performance of the developed array is evaluated by 3D electromagnetic simulations, bench tests, and MR measurements using phantoms. Efficient inter-element decoupling is demonstrated in flat configuration on a box-shaped phantom (Sij < -19 dB), and bent on a human torso phantom (Sij < -16 dB). Acceleration factors up to 3 can be employed in bent configuration with reasonable g-factors (<1.7) in an ROI at the position of the heart. The array enables geometrical conformity to bodies within a large range of size and shape and is compatible with parallel imaging and parallel transmission techniques.

Dates et versions

hal-02416476 , version 1 (17-12-2019)

Identifiants

Citer

Sajad Hosseinnezhadian, Roberta Frass-Kriegl, Sigrun Goluch-Roat, Michael Pichler, Jürgen Sieg, et al.. A flexible 12-channel transceiver array of transmission line resonators for 7 T MRI. Journal of Magnetic Resonance, 2018, 296, pp.47-59. ⟨10.1016/j.jmr.2018.08.013⟩. ⟨hal-02416476⟩
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