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Reduced Spatial Side Lobes in Chemical-shift Imaging by Elfar Adalsteinsson; Josh Star-Lack; Craig H. Meyer; Daniel M. Spielman is a Medicine article available to read on EtoBox.

What is Reduced Spatial Side Lobes in Chemical-shift Imaging about?

Density-weighted k-space sampling with spiral trajectories is used to reduce spatial side lobes in chemical-shift imaging (CSI). In this method, more time is spent collecting data at the center of k space and less time at the edges of k space in order to make the sampling density proportional to a given apodization function, subject to constraints imposed by gradient performance and Nyquist sampling. The efficient k-space coverage of spiral-based trajectories enables good control over the sampling density within practical in vivo scan times. The densityweighted acquisition is compared to a conventional, nonweighted spiral sampling without the application of a window function. For a fixed voxel size and imaging time, the noise variance is observed to be the same for both cases, while spatial side lobes are greatly reduced with the variable-density sampling. This method is demonstrated on a normal volunteer by imaging of brain metabolites at 1.5 T with both single slice CSI and volumetric CSI.

Who reads Reduced Spatial Side Lobes in Chemical-shift Imaging?

Author

Elfar Adalsteinsson; Josh Star-Lack; Craig H. Meyer; Daniel M. Spielman

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0740-3194)

Published

1999

Language

EN

Field

Medicine (Health Sciences)