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Fast Automatic Adjustment of On-Axis Shims for High-Resolution NMR

✍ Scribed by Jun Shen; Douglas L. Rothman

Publisher: Elsevier Science
Year: 1997
Tongue: English
Weight: 104 KB
Volume: 127
Category: Article
ISSN: 1090-7807
DOI: 10.1006/jmre.1997.1205

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✦ Synopsis

A one-dimensional approach for fast, robust, automatic adjustsition algorithm. The three-dimensional method has been ment of on-axis shims on high-resolution NMR spectrometers shown to perform the complete shimming process ( acquibased on polynomial fitting of field inhomogeneity is described. sition and data processing ) in 4.5 min and be able to adjust Spherical harmonic and nonspherical harmonic terms of the field 28 shims with 3 -4 iterations from zero shim currents distribution of shim coils are precalibrated as polynomial coeffito optimal field homogeneity on modern spectrometers cients by successively changing shim settings. This method greatly equipped with a SGI workstation. In this Communication, simplifies the shim precalibration and optimization procedures and we propose an alternative approach based on spherical

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