دورية أكاديمية
Parallel transmit capability of various RF transmit elements and arrays at 7T MRI.
| العنوان: | Parallel transmit capability of various RF transmit elements and arrays at 7T MRI. |
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| المؤلفون: | Rietsch SHG; Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, Essen, Germany.; High Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany., Orzada S; Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, Essen, Germany., Bitz AK; Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany.; Electromagnetic Theory and Applied Mathematics, Faculty of Electrical Engineering and Information Technology, University of Applied Sciences Aachen, Aachen, Germany., Gratz M; Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, Essen, Germany.; High Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany., Ladd ME; Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, Essen, Germany.; Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany., Quick HH; Erwin L. Hahn Institute for MR Imaging, University of Duisburg-Essen, Essen, Germany.; High Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany. |
| المصدر: | Magnetic resonance in medicine [Magn Reson Med] 2018 Feb; Vol. 79 (2), pp. 1116-1126. Date of Electronic Publication: 2017 Apr 10. |
| نوع المنشور: | Journal Article; Research Support, Non-U.S. Gov't |
| اللغة: | English |
| بيانات الدورية: | Publisher: Wiley Country of Publication: United States NLM ID: 8505245 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1522-2594 (Electronic) Linking ISSN: 07403194 NLM ISO Abbreviation: Magn Reson Med Subsets: MEDLINE |
| أسماء مطبوعة: | Publication: 1999- : New York, NY : Wiley Original Publication: San Diego : Academic Press, |
| مواضيع طبية MeSH: | Magnetic Resonance Imaging/*instrumentation, Computer Simulation ; Equipment Design ; Humans ; Radio Waves |
| مستخلص: | Purpose: In this work, 22 configurations for remote radiofrequency (RF) coil arrays consisting of different transmit element designs for 7 Tesla (T) ultrahigh-field MRI are compared by numerical simulations. Methods: Investigated transmit RF element types are rectangular loops, micro striplines, micro striplines with meanders, 250-mm shielded dipoles with meanders, and lambda over two dipoles with and without shield. These elements are combined in four different configurations of circumferential RF body arrays with four or eight transmit elements each. Comparisons included coupling behavior, degrees of freedom offered by the individual transmit patterns, and metrics like power and specific absorption rate efficiency. Results: Coupling between neighboring RF elements is elevated (up to -7 dB) for all arrays with eight elements, whereas it is below -25 dB for arrays with only four elements. The cumulative sum of singular values points out highest degrees of freedom for the central transversal, reduced values in the central coronal, and minimum values in the sagittal slice. Concerning power and SAR efficiency, eight lambda over two dipoles are most advantageous. Conclusions: Among the investigated remote arrays and parameters, a combination of eight dipoles appears to be most favorable for potential use in 7T body MRI. Magn Reson Med 79:1116-1126, 2018. © 2017 International Society for Magnetic Resonance in Medicine. (© 2017 International Society for Magnetic Resonance in Medicine.) |
| فهرسة مساهمة: | Keywords: 7 T; RF antenna array; parallel transmit (pTx); radio frequency (RF); ultrahigh field |
| تواريخ الأحداث: | Date Created: 20170411 Date Completed: 20190318 Latest Revision: 20190318 |
| رمز التحديث: | 20240628 |
| DOI: | 10.1002/mrm.26704 |
| PMID: | 28394080 |
| قاعدة البيانات: | MEDLINE |
Full Text Finder | تدمد: | 1522-2594 |
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| DOI: | 10.1002/mrm.26704 |