Dynamic shimming of the human brain at 7 T

Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering

Volumn 37 B, Issue 3, 2010, Pages 116-128

  Juchem, Christoph ^a   Nixon, Terence W ^a   Diduch, Piotr ^b   Rothman, Douglas L ^a   Starewicz, Piotr ^b   de Graaf, Robin A ^a  

^a YALE UNIVERSITY SCHOOL OF MEDICINE   (United States)

^b Resonance Research Inc   (United States)

Author keywords

Dynamic shim updating (DSU); Magnetic field homogenization; Shimming; Spherical harmonic functions

Indexed keywords

EID: 77955103637     PISSN: 15525031     EISSN: 1552504X     Source Type: Journal    
DOI: 10.1002/cmr.b.20169     Document Type: Article

References (30)

1. Golay MJE. 1958. Field homogenizing coils for nuclear spin resonance instrumentation. Rev Sci Instrum 29:313-315.
2. Romeo F, Hoult DI. 1984. Magnet field profiling: analysis and correcting coil design. Magn Reson Med 1:44-65.
3. de Graaf RA. 2008. In Vivo NMR Spectroscopy: Principles and Techniques. London: John Wiley. pp 494-497.
4. Gruetter R, Boesch C. 1992. Fast, noniterative shimming of spatially localized signals. In vivo analysis of the magnetic field along axes. J Magn Reson 96: 323-334.
5. Gruetter R. 1993. Automatic, localized in vivo adjustment of all firstand second-order shim coils. Magn Reson Med 29:804-811.
6. Shen J. 2001. Effect of degenerate spherical harmonics and a method for automatic shimming of oblique slices. NMR Biomed 14:177-183.
7. Zhang Y, Li S, Shen J. 2009. Automatic high-order shimming using parallel columns mapping (PACMAP). Magn Reson Med 62:1073-1079.
8. Wilson JL, Jenkinson M, Jezzard P. 2002. Optimization of static field homogeneity in human brain using diamagnetic passive shims. Magn Reson Med 48:906-914.
9. Wilson JL, Jezzard P. 2003. Utilization of an intraoral diamagnetic passive shim in functional MRI of the inferior frontal cortex. Magn Reson Med 50: 1089-1094.
10. Cusack R, Russell B, Cox SM, De Panfilis C, Schwarzbauer C, Ansorge R. 2005. An evaluation of the use of passive shimming to improve frontal sensitivity in fMRI. Neuroimage 24:82-91.
11. Hsu JJ, Glover GH. 2005. Mitigation of susceptibility-induced signal loss in neuroimaging using localized shim coils. Magn Reson Med 53:243-248.
12. Juchem C, Muller-Bierl B, Schick F, Logothetis NK, Pfeuffer J. 2006. Combined passive and active shimming for in vivo MR spectroscopy at high magnetic fields. J Magn Reson 183:278-289.
13. Juchem C, Nixon TW, McIntyre S, Rothman DL, de Graaf RA. 2010. Magnetic field homogenization of the human prefrontal cortex with a set of localized electrical coils. Magn Reson Med 63:171-180.
14. Blamire AM, Rothman DL, Nixon T. 1996. Dynamic shim updating: a new approach towards optimized whole brain shimming. Magn Reson Med 36:159-165.
15. Morrell G, Spielman D. 1997. Dynamic shimming for multi-slice magnetic resonance imaging. Magn Reson Med 38:477-483.
16. de Graaf RA, Brown PB, McIntyre S, Rothman DL, Nixon TW. 2003. Dynamic shim updating (DSU) for multislice signal acquisition. Magn Reson Med 49: 409-416.
17. Koch KM, McIntyre S, Nixon TW, Rothman DL, de Graaf RA. 2006. Dynamic shim updating on the human brain. J Magn Reson 180:286-296.
18. Koch KM, Brown PB, Rothman DL, de Graaf RA. 2006 Sample-specific diamagnetic and paramagnetic passive shimming. J Magn Reson 182:66-74.
19. Juchem C, Nixon TW, McIntyre S, Rothman DL, de Graaf RA. 2010. Magnetic field modeling with a set of localized individual coils. J Magn Reson 204:281-289.
20. Juchem C, Nixon TW, Diduch P, McIntyre S, Rothman DL, Starewicz P, de Graaf RA. 2010. Zeroto third-order dynamic shim updating of the human brain at 7 Tesla. Proc. ISMRM 2010, Stockholm, Sweden. p 222.
21. Jensen DJ, Brey WW, Delayre JL, Narayana PA. 1987. Reduction of pulsed gradient settling time in the superconducting magnet of a magnetic resonance instrument. Med Phys 14:859-862.
22. van Vaals JJ, Bergman AH. 1990. Optimization of eddy-current compensation. J Magn Reson 90:52-70.
23. Terpstra M, Andersen PM, Gruetter R. 1998. Localized eddy current compensation using quantitative field mapping. J Magn Reson 131:139-143.
24. Vaughan JT, Hetherington HP, Otu JO, Pan JW, Pohost GM. 1994. High frequency volume coils for clinical NMR imaging and spectroscopy. Magn Reson Med 32:206-218.
25. Smith SM. 2002. Fast robust automated brain extraction. Hum Brain Mapp 17:143-155.
26. Wen H, Jaffer FA. 1995. An in vivo automated shimming method taking into account shim current constraints. Magn Reson Med 34:898-904.
27. Miyasaka N, Takahashi K, Hetherington HP. 2006. Fully automated shim mapping method for spectroscopic imaging of the mouse brain at 9.4 T. Magn Reson Med 55:198-202.
28. Tyszka JM, Mamelak AN. 2002. Quantification of B0 homogeneity variation with head pitch by registered three-dimensional field mapping. J Magn Reson 159: 213-218.
29. Spielman DM, Adalsteinsson E, Lim KO. 1998. Quantitative assessment of improved homogeneity using higher-order shims for spectroscopic imaging of the brain. Magn Reson Med 40:376-382.
30. Wilson JL, Jenkinson M, de Araujo I, Kringelbach ML, Rolls ET, Jezzard P. 2002. Fast, fully automated global and local magnetic field optimization for fMRI of the human brain. Neuroimage 17:967-976.