Journal Articles Magnetic Resonance in Medicine Year : 2021

Open birdcage coil for head imaging at 7T

Abstract

To theoretically describe, design and test an open head birdcage coil, called opencage, that facilitates access to the patient under examination. This access improves the patient's comfort, but also may be suitable for many tasks, for example fMRI or motion correction. Theory and Methods: Using transfer matrix approach, the birdcagelike coil having non-periodical distribution of rungs is constructed with optimized currents in the coil's rungs. Subsequently, the the coil was adjusted in full-wave simulations. Eventually, these results were confirmed on phantom and in-vivo imaging. Results: Indeed, the high enough computed isolation coefficient between the feeding ports of the coil as well as a birdcage-like B + 1 pattern showed that the coil was properly optimized. After the numerical optimization, the coil was assembled and fine tuned and matched on the bench. Experimental assessment of the developed coil showed slightly lower B + 1 homogeneity, competitive transmit efficiency and coverage to the birdcage coil of comparable size. Conclusion: It was shown that the proposed open birdcage coil can be designed without dramatic drop of performance by means of B1 field homogeneity and efficiency, SAR.

Fichier principal
Vignette du fichier
main2.pdf (3.75 Mo) Télécharger le fichier
Origin Files produced by the author(s)
Licence

Dates and versions

hal-03443007 , version 1 (27-09-2022)

Licence

Identifiers

Cite

Anton V Nikulin, Alexandre Vignaud, Nikolai Avdievich, Djamel Berrahou, Julien Rosny, et al.. Open birdcage coil for head imaging at 7T. Magnetic Resonance in Medicine, 2021, 86 (4), pp.2290-2300. ⟨10.1002/mrm.28845⟩. ⟨hal-03443007⟩
138 View
571 Download

Altmetric

Share

  • More