Oneshot for Varian (G.A. Morris/M. Nilsson)

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Basic facts about Doneshot

Synopsis: DOSY pulse sequence using bipolar gradient pairs

Family: Diffusion experiments

Code authors:  gam? Information x gam not found in the Varian registry page

Copyright: Varian, Inc.

Introduction

The pulse sequence is a more elaborated version of BPPSTE sequence, using bipolar pulse pairs. This version includes bipolar heating compensation gradients that are incremented as the diffusion gradients are incremented.

RF parameters

• pw,tpwr,tof - 90^o pulse, its power level and transmitter offset
• satdly,satpwr,satfrq - length, power and offset of saturation pulse (used if satmode='y')

Gradient parameters

• gzlvl1 - strength of main gradient
• kappa - correction factor to gzlvl1 (a positive number, 0 < kappa < 1, most likely close to 0)
• gt1 - total length of gradient (split into two equal length bipolar pulses)
• gzlvl3, gt3 - spoiler gradient
• gzlvl_max - safety parameter, will trigger error message if gzlvl1*(1+kappa) > gzlvl_max

Delays

• del - main diffusion delay
• gstab - gradient recovery delay

Flags

• delflag - value 'y' turns on the "diffusion" part of the pulse sequence, 'n' - turns it into a one pulse 1D experiment
• wet - value 'y' turns on Wet water suppression
• satmode - value 'y' turns presaturation on

References

1. Wu, DH and Chen, AD and Johnson, CS. An improved diffusion-ordered spectroscopy experiment incorporating bipolar-gradient pulses. Journal of Magnetic Resonance, Series A 115(2):260--264, 1995. BibTeX [bppste]