How to correctly use the UTE and ZTE pulse sequences in Bruker's ParaVision software?

02 August 2024 1 9K Report

I am using a Bruker 600M solid-state NMR spectrometer with a Micro 2.5 microimaging system. The test sample is a tube of 1M LiCl aqueous solution, and the nucleus detected is 1H. I am trying to use this sample to debug the UTE pulse. However, in the actual sampling process, the results obtained with UTE often have very strange artifacts. Since the ParaVision manual provides only very limited content, I would like to know the following:

How does the UTE pulse achieve a lower echo time?

What are the common artifacts of the UTE pulse, and how can they be avoided?

What situations are UTE pulses generally used for? How should the parameters be set? Thank you for your help!

H. Douglas Morris

Tip 0 - start on a low salinity sample or just H2O.

Question 1 - UTE uses a block pulse or a very fast gaussian to generate RF, the rise time on the spectrometer is probably 10-50 microseconds depending on amplitude to generate a projection.

Question 2 - Common artifacts are pulse ring-through in the digitizer. That may be a problem here.

Question 3 - UTE is used for imaging short T2* species.

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