Double Tuned 1H-23Na Birdcage Coils for MRI at 7 T: Performance evaluation through electromagnetic simulations

F. Maggiorelli; A. Retico; E. Boskamp; F. Robb; A. Galante; M. Fantasia; M. Alecci; M. Tosetti; G. Tiberi

doi:10.1109/MeMeA.2018.8438777

Double Tuned ¹H-²³Na Birdcage Coils for MRI at 7 T: Performance evaluation through electromagnetic simulations

F. Maggiorelli, A. Retico, E. Boskamp, F. Robb, A. Galante, M. Fantasia, M. Alecci, M. Tosetti, G. Tiberi

Fondazione Stella Maris

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The aim of the present study is the electromagnetic evaluation of a 'four-ring' double-tuned (DT) birdcage coil designed for head imaging. The model consists of an inner Low-Pass (LP) birdcage coil and two externally nested High-Pass (HP) birdcage-like coils. LP and HP structures are tuned at the ²³Na and ¹H Larmor frequency at 7 T, respectively. Dimensional parameters are varied in order to optimize the radio frequency (RF) B₁ ⁺ field homogeneity at both Larmor frequencies. Results show that B₁ ⁺ field homogeneity at the ¹H Larmor frequency can be considerably increased by optimizing the mutual distance between the inner and outer coil structure length. This result is particularly significant in case of MRI at 7 T, to correct for the 'intrinsically' inhomogeneous B₁ ⁺ field due to the short wavelength.

Original language	English
Title of host publication	MeMeA 2018 - 2018 IEEE International Symposium on Medical Measurements and Applications, Proceedings
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Print)	9781538633915
DOIs	https://doi.org/10.1109/MeMeA.2018.8438777
Publication status	Published - Aug 16 2018
Event	13th IEEE International Symposium on Medical Measurements and Applications, MeMeA 2018 - Rome, Italy Duration: Jun 11 2018 → Jun 13 2018

Conference

Conference	13th IEEE International Symposium on Medical Measurements and Applications, MeMeA 2018
Country/Territory	Italy
City	Rome
Period	6/11/18 → 6/13/18

Keywords

Double Tuned RF coils
MRI at 7 T
Sodium Imaging
UHF MRI

ASJC Scopus subject areas

Biomedical Engineering
Health Informatics
Instrumentation

Access to Document

10.1109/MeMeA.2018.8438777

Cite this

Maggiorelli, F., Retico, A., Boskamp, E., Robb, F., Galante, A., Fantasia, M., Alecci, M., Tosetti, M., & Tiberi, G. (2018). Double Tuned ¹H-²³Na Birdcage Coils for MRI at 7 T: Performance evaluation through electromagnetic simulations. In MeMeA 2018 - 2018 IEEE International Symposium on Medical Measurements and Applications, Proceedings [8438777] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/MeMeA.2018.8438777

Double Tuned ¹H-²³Na Birdcage Coils for MRI at 7 T : Performance evaluation through electromagnetic simulations. / Maggiorelli, F.; Retico, A.; Boskamp, E.; Robb, F.; Galante, A.; Fantasia, M.; Alecci, M.; Tosetti, M.; Tiberi, G.

MeMeA 2018 - 2018 IEEE International Symposium on Medical Measurements and Applications, Proceedings. Institute of Electrical and Electronics Engineers Inc., 2018. 8438777.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Maggiorelli, F, Retico, A, Boskamp, E, Robb, F, Galante, A, Fantasia, M, Alecci, M, Tosetti, M & Tiberi, G 2018, Double Tuned ¹H-²³Na Birdcage Coils for MRI at 7 T: Performance evaluation through electromagnetic simulations. in MeMeA 2018 - 2018 IEEE International Symposium on Medical Measurements and Applications, Proceedings., 8438777, Institute of Electrical and Electronics Engineers Inc., 13th IEEE International Symposium on Medical Measurements and Applications, MeMeA 2018, Rome, Italy, 6/11/18. https://doi.org/10.1109/MeMeA.2018.8438777

Maggiorelli F, Retico A, Boskamp E, Robb F, Galante A, Fantasia M et al. Double Tuned ¹H-²³Na Birdcage Coils for MRI at 7 T: Performance evaluation through electromagnetic simulations. In MeMeA 2018 - 2018 IEEE International Symposium on Medical Measurements and Applications, Proceedings. Institute of Electrical and Electronics Engineers Inc. 2018. 8438777 https://doi.org/10.1109/MeMeA.2018.8438777

Maggiorelli, F. ; Retico, A. ; Boskamp, E. ; Robb, F. ; Galante, A. ; Fantasia, M. ; Alecci, M. ; Tosetti, M. ; Tiberi, G. / Double Tuned ¹H-²³Na Birdcage Coils for MRI at 7 T : Performance evaluation through electromagnetic simulations. MeMeA 2018 - 2018 IEEE International Symposium on Medical Measurements and Applications, Proceedings. Institute of Electrical and Electronics Engineers Inc., 2018.

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AB - The aim of the present study is the electromagnetic evaluation of a 'four-ring' double-tuned (DT) birdcage coil designed for head imaging. The model consists of an inner Low-Pass (LP) birdcage coil and two externally nested High-Pass (HP) birdcage-like coils. LP and HP structures are tuned at the 23Na and 1H Larmor frequency at 7 T, respectively. Dimensional parameters are varied in order to optimize the radio frequency (RF) B1 + field homogeneity at both Larmor frequencies. Results show that B1 + field homogeneity at the 1H Larmor frequency can be considerably increased by optimizing the mutual distance between the inner and outer coil structure length. This result is particularly significant in case of MRI at 7 T, to correct for the 'intrinsically' inhomogeneous B1 + field due to the short wavelength.

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