Although conventionally the WATERGATE method has been applied to the read pulse, there is no reason why it could not be applied earlier in the sequence. In this poster we look at the results from an experiment in which the WATERGATE filter is applied to the initial excitation pulse:
Applying WATERGATE to the excitation pulse requires that there is only transverse magnetisation at this point. Any tiny imperfection in the 90o pulse will lead to a large residual water peak. Hence in the sequence we use a trim pulse (e.g. 1ms). The sequence is very simple to implement and easy to use routinely. An example spectrum is shown as Figure 1 together with the comparable spectrum obtained using presaturation as Figure 2.
