Hi fslroi input output start number_of_volumes e.g. if you want volume 100 then use fslroi in out 99 1 hth Christian _______________________________________________ Christian F. Beckmann, DPhil Senior Lecturer, Clinical Neuroscience Department Division of Neuroscience and Mental Health Imperial College London Hammersmith Hospital - London W12 0NN Tel.: +44 (0) 208 383 3722 --- Fax: +44 (0) 208 383 2029 Email: [log in to unmask] http://www.imperial.ac.uk/medicine/people/c.beckmann/ Senior Research Fellow, FMRIB Centre University of Oxford JR Hospital - Oxford OX3 9DU Tel.: +44 (0) 1865 222551 --- Fax: +44 (0) 1865 222717 Email: [log in to unmask] http://www.fmrib.ox.ac.uk/~beckmann On 7 Jul 2008, at 23:49, Roderick McColl wrote: > Is there a FSL cmd similar to fslsplit which allows you to extract > one 3D from a 4D volume? > When you have several hundred volumes its a pain to create that many > 3Ds just to get a particular one. > I can't find an existing cmd for this. > Thanks > -roddy