 |
 |
you should always average your raw data. noise exerts a greater effect on images with higher diffusion weighting (less signal) so it is better to average first and then calculate the tensor/bedpost parameters. scott Matt Glasser wrote: > Why is that? Regardless, it is necessary to align your averages with some > rigid body registration before averaging. > > Peace, > > Matt. > > -----Original Message----- > From: FSL - FMRIB's Software Library [mailto:[log in to unmask]] On Behalf > Of Peter Kochunov > Sent: Friday, October 31, 2008 10:42 AM > To: [log in to unmask] > Subject: Re: [FSL] DTI Average > > It would be safer to average the scalar output of the dtifit, rather than > individual, diffusions-sensitized images. > pk > ----- Original Message ----- > From: "Departament de Psiquiatria i Psicobiologia Cli -nica UB Mundet" > <[log in to unmask]> > To: <[log in to unmask]> > Sent: Friday, October 31, 2008 10:07 AM > Subject: [FSL] DTI Average > > > Hi, we would like to know how to average two or more DTI adquisitions in FSL > software. Can you create an average image before preprocessing? Or you can > only average the values you calculate from a ROI in a FA map (for example) > of > every adquisition from every subject after preprocessing? > > Thank you. > -- ======================== Scott Kolbe MS Imaging Group Howard Florey Institute & Centre for Neuroscience University of Melbourne VIC, Australia, 3010. ph: +61 3 8344 1887 email: [log in to unmask] website: http://www.neuroimaging.org.au/index.php?id=383