Downsampling Strategies for MRS Data

Alexander Fuchs¹, Anke Henning, Peter Boesiger

MR acquired data is usually sampled at higher much higher frequencies than the Nyquist condition. Before further processing this data needs to be downsampled to reduce the burden on storage requirements and processing time. Two commonly used downsample strategies are applied to ideal spectroscopic data and different artifacts related to these methods are identified. Especially in spectroscopy, artifacts in the initial time points of FIDs or phase distortions can lead to problems in further quantitative evaluations. Therefore a method is proposed that avoids the described problems and gives more reliable downsampled data.