Optimization of nuclear magnetic resonance refocusing pulses to enhance signal intensity in gradient B0 field

Li, Xin, Xiao, Li-Zhi, Liu, Hua-Bing, Zhang, Zong-Fu, Guo, Bao-Xin, Yu, Hui-Jun and Zong, Fang-Rong (2013) Optimization of nuclear magnetic resonance refocusing pulses to enhance signal intensity in gradient B0 field. Wuli Xuebao, 62 14: . doi:10.7498/aps.62.147602


Author Li, Xin
Xiao, Li-Zhi
Liu, Hua-Bing
Zhang, Zong-Fu
Guo, Bao-Xin
Yu, Hui-Jun
Zong, Fang-Rong
Title Optimization of nuclear magnetic resonance refocusing pulses to enhance signal intensity in gradient B0 field
Journal name Wuli Xuebao   Check publisher's open access policy
Translated journal name Acta Physica Sinica
ISSN 1000-3290
Publication date 2013-07-01
Sub-type Article (original research)
DOI 10.7498/aps.62.147602
Open Access Status DOI
Volume 62
Issue 14
Total pages 7
Place of publication Beijing, China
Publisher Zhongguo Kexueyuan Wuli Yanjiusuo
Language chi
Formatted abstract
It is an efficient protocol to use the refocusing flip angle pulse technique technique to solve special engineering technical problems in nuclear magnetic resonance (NMR) measurements. By reducing RF pulse duration, the low refocusing flip angle pulses can consume lower power, Absorption rate of samples, and improve signal-to-noise ratio as well. To further analyze the mechanism mechanism of pulse angles, the dependence of signal intensity on RF pulse is studied in homogenous magnetic field and constant gradient magnetic field respectively. Afterwards, echo Amplitudes with various pointed angles and ranging angles from 0 ° to 180 ° are compared with regular sequence of 90 ° pulse followed by 180 ° pulses theoretically and experimentally. For the constant gradient field,The refocusing pulse of flip angle can be as low as 140 °, defined as the optimum herein, to obtain the strongest signal intensity, enhanced by 13% compared with that of 180 °. Furthermore, T 1 distributions measured by the normal and promising For distilled water at room temperature are compared, and good conformance of T 1 between the two pulse are obtained, which shows the optimal refocusing pulse can be directly applied to T 1 measurement. Enhanced in NMR logging while drilling and NMR online quick analysis.
Keyword Bloch equation
Nuclear magnetic resonance
Refocusing pulse angle
Signal intensity
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Brain Institute Publications
 
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