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Dear Zhivago, there is nothing "pending" after e.g. Coregister-Estimate is finished. A 3D image consists of voxel data and a description of the orientation of the voxel grid in "world space". Coregister/Realign Estimate will update the orientation information in the header. This will move the voxel grid to a different position in world space without altering the contents of the image. Smoothing does not change the orientation of the voxel grid, it only computes new voxel values. Reslice or any of the normalisation procedures produce a new grid and compute new voxel values, based on the original data. SPM functions like spm_slice_vol, spm_sample_vol always apply the correct spatial information when reading data from an image file. This is used throughout SPM. Examples include spm_orthviews or spm_imcalc, where you can easily display images or run computations on images having different orientations and voxel sizes. There are only a few places where SPM explicitly requires images to have the same orientation and voxel size. Hope this helps, Volkmar Zitat von Zhivago <[log in to unmask]>: > Dear Volkmar, > > I was talking about information written to the header when you do > something like Coregister-Estimate, which is completed when it is > followed by another operation like Smooth. I'm basically talking > about stringing operations. In such cases, like after > Coregister-Estimate, the header of the nii file is updated and hence I > see a change in the timestamp of the file. But if open the file in > MATLAB using spm functions and display the image, I would not see the > effect of coregisration, right? My question is, how do I know there > are any pending transformations stored in the header and how do I > implement them. > > Cheers, > Zhivago... > > On Thu, May 28, 2015 at 2:24 PM, Volkmar Glauche > <[log in to unmask]> wrote: >> Dear Zhivago, >> >> SPM/MATLAB has no notion of "pending" operations. All operations >> are run serially in the order specified in batch jobs or script >> files. Although MATLAB GUI widgets and some parts of figure windows >> might appear to stay responsive, MATLAB will be in "busy" mode >> until started computations are finished. >> >> Best, >> >> Volkmar > -- Freiburg Brain Imaging http://fbi.uniklinik-freiburg.de/ Tel. +761 270-54110 Fax. +761 270-53100