Water suppression in MR spectroscopic imaging can be sensitive to variations in B1 in the sample, such as are present at 7 tesla. This work compares two versions of the WET water suppression method, the standard 3-pulse method and the extended 4-pulse method which is expected to be less sensitive to B1 variation. It is found that the 4-pulse method provides a greater consistency of water suppression efficiency across a range of B1 in both phantoms and the brain at 7T.
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