| Zugriffsnummer | 46336 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | 32-Channel self-grounded bow-tie transceiver array for cardiac MR at 7.0T |
| Autor(in); Institution |
Eigentler, T.; Berlin Ultrahigh Field Facility (B.U.F.F.), Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, GERMANY
Kuehne, A.; MRI.TOOLS GmbH, Berlin, GERMANY
Boehmert, L.; Berlin Ultrahigh Field Facility (B.U.F.F.), Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, GERMANY
Dietrich, Sebastian; 8.1, Biomedizinische Magnetresonanz, PTB-Berlin
Els, A.; Berlin Ultrahigh Field Facility (B.U.F.F.), Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, GERMANY
Waiczies, H.; MRI.TOOLS GmbH, Berlin, GERMANY
Niendorf, T.; Berlin Ultrahigh Field Facility (B.U.F.F.), Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, GERMANY
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| Quelle/Jahr | Magnetic Resonance in Medicine: 86 (2021), 5, 2862 - 2879 |
| ISSN | 0740-3194 (PRINT) ; 1522-2594 (ONLINE) |
| DOI | |
| Verlag | London: Wiley |
| Freie Schlagworte | cardiovascular MRI ; electrical dipole ; parallel imaging ; RF coil ; transceiver array ; ultrahigh field MRI |
| Zusammenfassung | Purpose Design, implementation, evaluation, and application of a 32-channel Self-Grounded Bow-Tie (SGBT) transceiver array for cardiac MR (CMR) at 7.0T. Methods The array consists of 32 compact SGBT building blocks. Transmission field (B1+) shimming and radiofrequency safety assessment were performed with numerical simulations and benchmarked against phantom experiments. In vivo B1+ efficiency mapping was conducted with actual flip angle imaging. The array’s applicability for accelerated high spatial resolution 2D FLASH CINE imaging of the heart was examined in a volunteer study (n = 7). Results B1+ shimming provided a uniform field distribution suitable for female and male subjects. Phantom studies demonstrated an excellent agreement between simulated and measured B1+ efficiency maps (7% mean difference). The SGBT array afforded a spatial resolution of (0.8 × 0.8 × 2.5) mm3 for 2D CINE FLASH which is by a factor of 12 superior to standardized cardiovascular MR (CMR) protocols. The density of the SGBT array supports 1D acceleration of up to R = 4 (mean signal-to-noise ratio (whole heart) ≥ 16.7, mean contrast-to-noise ratio ≥ 13.5) without impairing image quality significantly. Conclusion The compact SGBT building block facilitates a modular high-density array that supports accelerated and high spatial resolution CMR at 7.0T. The array provides a technological basis for future clinical assessment of parallel transmission techniques. |
| Themenbereich der Metrologie | Metrologie in der Medizin |