Apparent diffusion behaviour of intermolecular double-quantum coherence modulated by a distant dipolar field in solution NMR |
| |
Authors: | Shen Gui-Ping Cai Cong-Bo Cai Shu-Hui and Chen Zhong |
| |
Institution: | Department of Physics, Fujian Key Laboratory of Plasma and Magnetic Resonance, Xiamen University, Xiamen 361005, China; Department of Communications Engineering, Xiamen University, Xiamen 361005, China |
| |
Abstract: | A modified correlated spectroscopy (COSY) revamped with
asymmetric Z-gradient echo detection sequence was designed to
investigate the influence of diffusion behaviour on intermolecular
double-quantum coherence signal attenuation during the
pre-acquisition period. Theoretical formulas were deduced and
experimental measurements and simulations were performed. It is
found that the diffusion behaviour of intermolecular double-quantum
coherence in the pre-acquisition period may be different from that of
conventional single-quantum coherence, depending on the relative
orientation of diffusion weighting gradients to coherence selection
gradients. When the orientation of the diffusion weighting gradients is
parallel or anti-parallel to the orientation of the coherence
selection gradients, the diffusion is modulated by the distant
dipolar field. This study is helpful for understanding the signal
properties in intermolecular double-quantum coherence magnetic
resonance imaging. |
| |
Keywords: | nuclear magnetic resonance intermolecular double-quantum
coherences distant dipolar field diffusion |
本文献已被 维普 等数据库收录! |
| 点击此处可从《中国物理 B》浏览原始摘要信息 |
| 点击此处可从《中国物理 B》下载免费的PDF全文 |
|