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Hi Pieter The 32 Channel coil is very good, but it is very complex and a lot of things can go wrong. We recently had our 2.5 year old 32 coil replaced because it was sometimes causing artifacts in the EPI images. Could you send me some screen shots of the problematic images, then I can possibly help you. Best Torben Den Uge:18 30/04/2012 kl. 14.05 skrev Pieter Vandemaele: > Dear SPM'ers, > > My question is off topic. > We now have a Siemens Trio Tim with 8ch and 32ch head coil. > The 8ch works perfect, MPRAGE and the standard epi (epfid2d1) (transversal) data looks fine. > The 32ch is something else. The MPRAGE looks fine, but when we checked the reconstructed images, we got a stripe artefact in the sagittal plane which is variable over time. The data is useless. > > Has someone of you seen this before? Is this due to the sequence parameters or is the 32ch faulty? In case of the latter, we would expect a bad MPRAGE. > > All input will be greatly appreciated. > > Pieter > > > -- > Pieter Vandemaele > MSc Ing, Site Manager > Ghent Institute for Functional and Metabolic Imaging > De Pintelaan 185 -1K12 > B-9000 Ghent > BELGIUM > > tel: 0032 (0)9 332 48 20 > fax: 0032 (0)9 332 49 69 > e-mail: [log in to unmask]