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Hi Doug, I'm not an expert, but I think if you use avwmaths_32R (instead of avwmaths) it will force your output to be a float instead of a short int. avwmaths_64R will output a double float. Hope that's right! Krish On 23/7/04 9:31 pm, "Doug Greve" <[log in to unmask]> wrote: > Is there a way to change the precision of an analyze file? It would be > nice if avwmaths could do it, when rescaling for example. My problem is > that I need to rescale a B0 phase map. The DICOM for this has short > precision and ranges from 0-4095, so here's what I'm doing: > > avwmaths phase0.hdr -sub 2047.5 phase1.hdr > avwmaths phase1.hdr -mul 0.00153436 phase2.hdr > > The problem is that each output stays as a short, so the resulting phase > map (phase2.hdr) is truncated and only has values of -3,-2,-1,0,2,1,3. > > thanks > > doug > > > > > > > -- > Douglas N. Greve, Ph.D. > MGH-NMR Center > [log in to unmask] > Phone Number: 617-724-2358 > Fax: 617-726-7422 > -- Dr K.D. Singh Senior Lecturer and Convenor of the Neuroimaging Research Group, Director, MRI Research Centre, Neurosciences Research Institute Aston University, Birmingham B4 7ET, U.K. Tel/Fax: +44 (0)121 [204 3865/3864]/[333 4220] [log in to unmask], http://www.aston.ac.uk/lhs/staff/singhkd/