Hi,
The papers on FLIRT (and even the technical reports) do not go into this level of detail.
The reference image is used to choose the voxel size and resolution, but there is also a
certain amount of blurring imposed on the image prior to downsampling, in order to make
sure that the voxel intensities reflect the average intensity of the region covered by the
new, larger voxel and not just the single, small voxel that lay at the centre of the new voxel.
If you do not like the blurring imposed, then you can avoid it by using the -noresampblur
option. There is no blurring done when you upsample to sample to a very similar resolution.
I hope this gives you the information you wanted.
All the best,
Mark
On 28 Feb 2011, at 17:18, Sachin Dixit wrote:
> Hello
>
> I am using Flirt command for conversion of standard image in 222 space to functional image in 3.4*3.4*5 and vice versa:
> flirt -in input -ref ref_image -init standard2example_func.mat/or other -applyxfm -out out_image
>
> Can you please tell me the related paper which explain that how the voxels are handled (precisely about the algorithm) using Flirt command when you downsample or upsample the image conceptually?
>
>
> Sachin
>
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