Topgaard Daniel, Martin Rachel W, Sakellariou Dimitris, Meriles Carlos A, Pines Alexander
Materials Sciences Division, Ernest Orlando Lawrence Berkeley National Laboratory and Department of Chemistry, University of California, Berkeley, CA 94720, USA.
Proc Natl Acad Sci U S A. 2004 Dec 21;101(51):17576-81. doi: 10.1073/pnas.0408296102. Epub 2004 Dec 9.
A way to use adiabatic radiofrequency pulses and modulated magnetic-field gradient pulses, together constituting a "shim pulse," for NMR spectroscopy and imaging is demonstrated. These pulses capitalize on phase shifts derived from probe gradient coils to compensate for nonlinear intrinsic main magnetic field homogeneity for spectroscopy, as well as for deviations from linear gradients for imaging. This approach opens up the possibility of exploiting cheaper, less-than-perfect magnets and gradient coils for NMR applications.
展示了一种使用绝热射频脉冲和调制磁场梯度脉冲(共同构成一个“匀场脉冲”)进行核磁共振光谱学和成像的方法。这些脉冲利用来自探头梯度线圈的相移来补偿光谱学中非线性的固有主磁场均匀性,以及成像中与线性梯度的偏差。这种方法为利用更便宜、不太完美的磁体和梯度线圈进行核磁共振应用开辟了可能性。