B1-field inhomogeneity problem of MRI: Basic investigations on a head-tissue-simulating cylinder phantom excited by a birdcage-mode

2012 ◽  
Author(s):  
A. Rennings ◽  
L. Chen ◽  
S. Otto ◽  
D. Erni
Keyword(s):  
Field Inhomogeneity ◽  
B1 Field ◽  
Inhomogeneity Problem

Quantitative T1ρ imaging using phase cycling for B0 and B1 field inhomogeneity compensation

2011 ◽  
Vol 29 (5) ◽  
pp. 608-619 ◽  
Author(s):  
Weitian Chen ◽  
Atsushi Takahashi ◽  
Eric Han
Keyword(s):  
Field Inhomogeneity ◽  
Phase Cycling ◽  
B1 Field

scholarly journals Suppression of probe background signals via B1 field inhomogeneity

2011 ◽  
Vol 209 (2) ◽  
pp. 300-305 ◽  
Author(s):  
Jian Feng ◽  
Jeffrey A. Reimer
Keyword(s):  
Field Inhomogeneity ◽  
B1 Field

scholarly journals Transmit B1+ field inhomogeneity and T1estimation errors in breast DCE-MRI at 3 tesla

2013 ◽  
Vol 38 (2) ◽  
pp. 454-459 ◽  
Author(s):  
Kyunghyun Sung ◽  
Bruce L. Daniel ◽  
Brian A. Hargreaves
Keyword(s):  
3 Tesla ◽  
Field Inhomogeneity ◽  
Dce Mri ◽  
B1 Field

scholarly journals Using nutation-frequency-selective pulses to reduce radio-frequency field inhomogeneity in solid-state NMR

2020 ◽  
Author(s):  
Kathrin Aebischer ◽  
Nino Wili ◽  
Zdeněk Tošner ◽  
Matthias Ernst
Keyword(s):  
Solid State ◽  
Radio Frequency ◽  
Solid State Nmr ◽  
Sample Volume ◽  
Field Inhomogeneity ◽  
Spin Lock ◽  
Selective Pulses ◽  
Physical Volume ◽  
The Family ◽  
B1 Field

Abstract. Radio-frequency (rf) field inhomogeneity is a common problem in NMR which leads to non-ideal rotations of spins in parts of the sample. Often, a physical volume restriction of the sample is used to reduce the effects of rf-field inhomogeneity especially in solid-state NMR where spacers are inserted to reduce the sample volume to the centre of the coil. We show that band-selective pulses in the spin-lock frame can be used to apply B1-field selective inversions to spins that experience selected parts of the rf-field distribution. Any frequency band-selective pulse can be used for this purpose but we chose the family of I-BURP pulses (H. Geen, R. Freeman, Band-Selective Radiofrequency Pulses, J. Magn. Reson. 93 (1991) 93–141) for the measurements demonstrated here. As an example, we show that the implementation of such pulses improves homonuclear frequency-switched Lee-Goldburg decoupling in solid-state NMR.

The effect of B1 field inhomogeneity and the nonselective inversion profile on the kinetics of FAIR-based perfusion MRI

2005 ◽  
Vol 53 (6) ◽  
pp. 1355-1362 ◽  
Author(s):  
Janneke Schepers ◽  
Matthias J. P. van Osch ◽  
Lambertus W. Bartels ◽  
Sean N. Heukels ◽  
Max A. Viergever ◽  
...  
Keyword(s):  
Perfusion Mri ◽  
Field Inhomogeneity ◽  
B1 Field ◽  
Kinetics Of

scholarly journals Using nutation-frequency-selective pulses to reduce radio-frequency field inhomogeneity in solid-state NMR

2020 ◽  
Vol 1 (2) ◽  
pp. 187-195
Author(s):  
Kathrin Aebischer ◽  
Nino Wili ◽  
Zdeněk Tošner ◽  
Matthias Ernst
Keyword(s):  
Solid State ◽  
Radio Frequency ◽  
Solid State Nmr ◽  
Sample Volume ◽  
Field Inhomogeneity ◽  
Spin Lock ◽  
Selective Pulses ◽  
Physical Volume ◽  
The Family ◽  
B1 Field

Abstract. Radio-frequency (rf) field inhomogeneity is a common problem in NMR which leads to non-ideal rotations of spins in parts of the sample. Often, a physical volume restriction of the sample is used to reduce the effects of rf-field inhomogeneity, especially in solid-state NMR where spacers are inserted to reduce the sample volume to the centre of the coil. We show that band-selective pulses in the spin-lock frame can be used to apply B1-field selective inversions to spins that experience selected parts of the rf-field distribution. Any frequency band-selective pulse can be used for this purpose, but we chose the family of I-BURP pulses (Geen and Freeman, 1991) for the measurements demonstrated here. As an example, we show that the implementation of such pulses improves homonuclear frequency-switched Lee–Goldburg decoupling in solid-state NMR.

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