7 T body MRI: B1 shimming with simultaneous SAR reduction

Physics in Medicine and Biology

Volumn 52, Issue 17, 2007, Pages 5429-5441

  Van Den Bergen, Bob ^a   Van Den Berg, Cornelis A T ^a   Bartels, Lambertus W ^a   Lagendijk, Jan J W ^a  

^a UNIVERSITY MEDICAL CENTER UTRECHT   (Netherlands)

Author keywords

[No Author keywords available]

Indexed keywords

ABSORPTION; APPROXIMATION THEORY; ELECTROMAGNETIC FIELD EFFECTS; MAGNETIC RESONANCE IMAGING; OPTIMIZATION;

GENERIC METHOD; PHANTOM MODEL; SHIMMING TECHNIQUE;

RADIOFREQUENCY SPECTROSCOPY;

AMPLITUDE MODULATION; ARTICLE; AUDIOVISUAL EQUIPMENT; ELECTRIC CONDUCTIVITY; ELECTRIC FIELD; ELECTROMAGNETIC FIELD; ENERGY ABSORPTION; IMAGE QUALITY; NUCLEAR MAGNETIC RESONANCE IMAGING; PARAMETER; PHANTOM; PRIORITY JOURNAL; RADIOFREQUENCY; SIMULATION; TECHNIQUE; WHOLE BODY IMAGING;

BODY BURDEN; COMPUTER SIMULATION; HUMANS; IMAGE ENHANCEMENT; IMAGE INTERPRETATION, COMPUTER-ASSISTED; MAGNETIC RESONANCE IMAGING; MODELS, BIOLOGICAL; RADIATION DOSAGE; RADIOMETRY; WHOLE-BODY COUNTING;

EID: 34548163897     PISSN: 00319155     EISSN: 13616560     Source Type: Journal    
DOI: 10.1088/0031-9155/52/17/022     Document Type: Article

References (31)

1. Abraham R and Ibrahim T S 2007 Proposed radiofrequency phased-array excitation scheme for homogeneous and localized 7-tesla whole-body imaging based on full-wave numerical simulations Magn. Reson. Med. 57 235-42
2. Adriany G et al 2005 Transmit and receive transmission line arrays for 7 Tesla parallel imaging Magn. Reson. Med. 53 434-45
3. Collins C M et al 2002 Different excitation and reception distributions with a single-loop transmit-receive surface coil near a head-sized spherical phantom at 300 MHz Magn. Reson. Med. 47 1026-8
4. Collins C M, Liu W, Schreiber W, Yang Q X and Smith M B 2005 Central brightening due to constructive interference with, without, and despite dielectric resonance J. Magn. Reson. Imaging 21 192-6
5. 1 distribution, SNR and SAR of surface coil adjacent to an anatomically-accurate human body model Magn. Reson. Med. 45 692-9
6. Gabriel C 1996 Compilation of the dielectric properties of body tissues at RF and microwave frequencies Brooks Air Force Technical Report AL/OE-TR-1996-0037
7. Glover G H, Hayes C E, Pelc N J, Edelstein W A, Mueller O M, Hart H R, Hardy C J, O'Donnell M and Barber W D 1985 Comparison of linear and circular polarization for magnetic resonance imaging J. Magn. Reson. 64 255-70
8. Graesslin I et al 2006 Whole body 3T MRI system with eight parallel RF transmission channels Proc. 14th Ann. Meeting of ISMRM (Seattle, WA: International Society of Magnetic Resonance in Medicine) p 129
9. Hoult D I 2000 The principle of reciprocity in signal strength calculations: a mathematical guide Concepts Magn. Reson. 12 173-87
10. Hoult D I and Phil D 2000 Sensitivity and power deposition in a high field imaging experiment J. Magn. Reson. Imaging 12 46-67
11. Ibrahim T S 2006 Ultrahigh-field MRI whole-slice and localized RF field excitations using the same RF transmit array IEEE Trans. Med. Imaging 25 1341-7
12. Ibrahim T S, Lee R, Baertlein A, Abduljalil A M, Zhu H and Robitaille P L 2001 Effect of RF coil excitation on field inhomogeneity at ultra high fields: a field optimized TEM resonator Magn. Reson. Med. 19 1339-47
13. Ibrahim T S, Lee R, Baertlein B A, Kangarlu A and Robitaille P L 2000 Application of finite difference time domain method for the design of birdcage RF head coils using multi-port excitations Magn. Res. Imaging 18 733-42
14. Katscher U, Boernert P, Leussler C and Van den Brink J S 2003 Transmit sense Magn. Reson. Med. 49 144-50
15. Lawrence C and Tits A L 1998 Feasible sequential quadratic programming for finely discretized problems from SIP Semi-Infinite Programming ed R Reemtsen and J J Rückmann (Dordrecht: Kluwer) pp 159-93
16. Li B K, Liu F and Crozier S 2005 Focused, eight-element transceive phased array coil for parallel magnetic resonance imaging of the chest-theoretical considerations Magn. Reson. Med. 53 1251-7
17. Mao W, Collins C M and Smith M B 2006 Exploring the limits of RF shimming: single slice and whole brain field optimizations at up to 600 MHz with transmit arrays up to 80 elements Proc. 14th Ann. Meeting of ISMRM (Seattle, WA: International Society of Magnetic Resonance in Medicine) p 1383
18. 1 shimming for imaging the prostate at 7 tesla Proc. 15th Ann. Meeting of ISMRM (Berlin, Germany: International Society of Magnetic Resonance in Medicine) p 799
19. Pinkerton R G, Near J P, Barberi E A, Menon R S and Bartha R 2007 Transceive surface coil array for MRI of the human prostate at 4 T Magn. Reson. Med. 57 455-8
20. Robitaille P M L et al 1998 Human magnetic resonance imaging at 8 T NMR Biomed. 11 263-5
21. Taflove A 1995 Computational Electrodynamics: The Finite-Difference Time-Domain Method (Boston, MA: Artech House Publishers)
22. US Food and Drug Administration 2003 Criteria for significant risk investigations of magnetic resonance diagnostic devices; guidance for industry and FDA staff Document 793 http://www.fda.gov/cdrh/ode/guidance/793.pdf.
23. Van de Kamer J B, De Leeuw A A C, Hornsleth S N, Kroeze H, Kotte A N T J and Lagendijk J J W 2001 Development of a regional hyperthermia treatment planning system Int. J. Hyperthermia 17 207-20
24. 1 destructive interference and spatial phase patterns at 7 T with a head transceiver array coil Magn. Reson. Med. 54 1503-18
25. 1 imaging Phys. Med. Biol. 49 5029-42
26. 1 homogenization and SAR hotspot suppression using an MR phased array transmit coil Magn. Reson. Med. 57 577-86
27. Vaughan J T, Adriany G, Snyder C J, Tain J, Thiel J, Bolinger L, Liu H, DelaBarre L and Ugurbil K 2004 Efficient high-frequency body coil for high-field MRI Magn. Reson. Med. 52 851-9
28. Vaughan J T et al 2001 7 T versus 4 T: RF power, homogeneity, and signal-to-noise comparison in head images Magn. Reson. Med. 46 24-30
29. Vaughan J T et al 2006 9.4 t human MRI: preliminary results Magn. Reson. Med. 56 1274-82
30. Vaughan J T, Hetherington H P, Otu J O, Pan J W and Pohost G M 1994 High frequency volume coils for clinical NMR imaging and spectroscopy Magn. Reson. Med. 32 206-18
31. Wang J, Yang Q X, Zhang X, Collins C M, Smith M B, Zhu X H, Adriany G, Ugurbil K and Chen W 2002 Polarization of the RF field in a human head at high field: a study with a quadrature surface coil at 7.0 T Magn. Reson. Med. 48 362-9