Preventing truncation artifacts

This 3D data set has only 512 complex points in the direct (¹H) dimension, and the data is digitally filtered, so the first ~70 points are zero.  It is a good idea to step through the slices (with VW) and examine the data before beginning processing.  This allows experimentation with processing parameters to determine which will give the best results.

Here is a slice from the 3D data

The FID does not approach zero at the end of the acquisition time due to the large, low-frequency water signal.

Following the RD operation, we have a large discontinuity.

After FT, this gives large "wiggles".

Here is the same slice, processed with cosine multiplication before RD, and then DH.

Last updated: 1/22/03

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