| Zugriffsnummer | 48876 |
| Dokumenttyp | Konferenzartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Absolute B1+ mapping at low RF power in the body stem at 7T using magnetic resonance fingerprinting |
| Autor(in); Institution |
Lutz, Max; 8.1, Biomedizinische Magnetresonanz, PTB-Berlin
Flassbeck, S.; Dept. of Radiology, Center for Biomedical Imaging, New York, NY, USA; Center for Advanced Imaging Innovation and Research, New York, NY, USA
Gatefait, Constanze; 8.1, Biomedizinische Magnetresonanz, PTB-Berlin
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| Quelle/Jahr | 13th Annual Scientific Symposium on Clinical Needs, Research Promises and Technical Solutions in Ultrahigh Field MR : Proceedings:(2022), 39 - 42 |
| Konferenzangaben | 13th Annual Scientific Symposium on Clinical Needs, Research Promises and Technical Solutions in Ultrahigh Field MR, Berlin, 9, September 2022, Germany |
| Freie Schlagworte | B1+ mapping ; low FA mapping ; 7T ; body MRI |
| Zusammenfassung | The benefits of MRI at ultrahigh fields (≥7T) come at the cost of inhomogeneous transmit magnetic fields (B1+) leading to spatial flip angle (FA) variations and therefore affecting image contrast. Different methods exist to improve B1+ homogeneity, among them parallel transmission (pTx). For these optimizations, (absolute) B1+ maps are a prerequisite. However, their measurement in the body stem at 7T is limited or prevented by long acquisition times, respiratory motion, and especially RF power demand. To overcome these issues, we investigate absolute B1+ mapping in the human body at 7T using Magnetic Resonance Fingerprinting (MRF). The basic feasibility of MRF based B1+ quantification in the abdomen has already been demonstrated previously. Our aim in this work is to determine B1+ as precisely as possible with limited RF power (8kW total at our system) using MRF. Furthermore, measurements are conducted under free breathing and quantitatively compared with a recently presented radial phase-encoded (RPE) AFI. |
| Themenbereich der Metrologie | Metrologie in der Medizin |
Zitierung
Lutz, M., Aigner, C. S., Dietrich, S., Flassbeck, S., Gatefait, C., Kolbitsch, C., & Schmitter, S. (2022). Absolute B1+ mapping at low RF power in the body stem at 7T using magnetic resonance fingerprinting. 13th Annual Scientific Symposium on Clinical Needs, Research Promises and Technical Solutions in Ultrahigh Field MR, Berlin, 9, September 2022, Germany.