Double Tuned 1 H- 23 Na Birdcage Coils for MRI at 7 T : Performance evaluation through electromagnetic simulations
作者： Maggiorelli F. , Retico A. , Boskamp E. , Robb F. , Galante A.
DOI: 10.1109/MEMEA.2018.8438777
关键词: Field (physics) 、 Radio frequency 、 Nuclear magnetic resonance 、 Larmor precession 、 Physics 、 Birdcage coil 、 Wavelength 、 Field homogeneity 、 Outer coil
摘要: The aim of the present study is electromagnetic evaluation a ‘four-ring’ double-tuned (DT) birdcage coil designed for head imaging. model consists an inner Low-Pass (LP) and two externally nested High-Pass (HP) birdcage-like coils. LP HP structures are tuned at 23Na 1H Larmor frequency 7 T, respectively. Dimensional parameters varied in order to optimize radio (RF) B 1 + field homogeneity both frequencies. Results show that can be considerably increased by optimizing mutual distance between outer structure length. This result particularly significant case MRI correct ‘intrinsically’ inhomogeneous due short wavelength.
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Fernando E. Boada, George LaVerde, Charles Jungreis, Edwin Nemoto, Costin Tanase, Ileana Hancu, Loss of cell ion homeostasis and cell viability in the brain: what sodium MRI can tell us. Current Topics in Developmental Biology. ,vol. 70, pp. 77- 101 ,(2005) , 10.1016/S0070-2153(05)70004-1
Erik K Insko, David B Clayton, Mark A Elliott, In vivo sodium MR imaging of the intervertebral disk at 4 T. Academic Radiology. ,vol. 9, pp. 800- 804 ,(2002) , 10.1016/S1076-6332(03)80350-1
Keith R. Thulborn, Tatyana S. Gindin, Denise Davis, Patricia Erb, Comprehensive MR Imaging Protocol for Stroke Management: Tissue Sodium Concentration as a Measure of Tissue Viability in Nonhuman Primate Studies and in Clinical Studies Radiology. ,vol. 213, pp. 156- 166 ,(1999) , 10.1148/RADIOLOGY.213.1.R99SE15156
James Tropp, The theory of an arbitrarily perturbed bird-cage resonator, and a simple method for restoring it to full symmetry Journal of Magnetic Resonance. ,vol. 95, pp. 235- 243 ,(1991) , 10.1016/0022-2364(91)90214-E
Sònia Nielles-Vallespin, Marc-André Weber, Michael Bock, André Bongers, Peter Speier, Stephanie E. Combs, Johannes Wöhrle, Frank Lehmann-Horn, Marco Essig, Lothar R. Schad, 3D radial projection technique with ultrashort echo times for sodium MRI: Clinical applications in human brain and skeletal muscle Magnetic Resonance in Medicine. ,vol. 57, pp. 74- 81 ,(2007) , 10.1002/MRM.21104
Andrew J. Wheaton, Arijitt Borthakur, Erik M. Shapiro, Ravinder R. Regatte, Sarma V. S. Akella, J. Bruce Kneeland, Ravinder Reddy, Proteoglycan loss in human knee cartilage: quantitation with sodium MR imaging--feasibility study. Radiology. ,vol. 231, pp. 900- 905 ,(2004) , 10.1148/RADIOL.2313030521
Ronald Ouwerkerk, Karen B. Bleich, Joseph S. Gillen, Martin G. Pomper, Paul A. Bottomley, Tissue Sodium Concentration in Human Brain Tumors as Measured with 23Na MR Imaging Radiology. ,vol. 227, pp. 529- 537 ,(2003) , 10.1148/RADIOL.2272020483
Mark C. Leifer, Resonant Modes of the Birdcage Coil Journal of Magnetic Resonance. ,vol. 124, pp. 51- 60 ,(1997) , 10.1006/JMRE.1996.7488
Günter Steidle, Hansjörg Graf, Fritz Schick, Sodium 3-D MRI of the human torso using a volume coil. Magnetic Resonance Imaging. ,vol. 22, pp. 171- 180 ,(2004) , 10.1016/J.MRI.2003.08.007
Jeffrey R. Fitzsimmons, Barbara L. Beck, H. Ralph Brooker, Double resonant quadrature birdcage. Magnetic Resonance in Medicine. ,vol. 30, pp. 107- 114 ,(1993) , 10.1002/MRM.1910300116