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Volumetric NMR imaging with time-varying gradients

✍ Scribed by Albert Macovski

Publisher
John Wiley and Sons
Year
1985
Tongue
English
Weight
670 KB
Volume
2
Category
Article
ISSN
0740-3194

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✦ Synopsis

A novel generalized processing system is described whereby, using time-varying gradients, simultaneous data acquisition can be provided for all points in a volume. This is in sharp distinction to the sensitive-point method where only the null region is imaged. It is shown that time-varying gradients systems provide unique phase modulation functions which, when appropriately decoded, enable every point in the volume to be simultaneously imaged from a single FID signal. Methods are shown using the technique to provide simultaneously acquired, localized NMR spectra. Alternative gradient signals are considered including both periodic and aperiodic waveforms.

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## Abstract Reconstruction of high‐quality MR images requires precise knowledge of the dynamic gradient magnetic fields used to perform spatial encoding. System delays and eddy currents can perturb the gradient fields in both time and space and significantly degrade the image quality for acquisitio