[Vv] help about 2D+t deformation field view

[Simon Rit]

Hi Alex,
I have tried to reproduce your problem. I have a sequence and a vector
field created from the online example. If I open the sequence (Open nD
image as (n-1)D sequence) and overlay the vector field, I can see the
first slice of the vector field. However, when pressing play, the vf
does not animate while the image does. I'm not sure why, I have filled
a bug report:
http://kingkong.grid.creatis.insa-lyon.fr:9002/issues/442

What you can do, is open the image as a regular 3D image and overlay
the vector field. You can then scroll in "time" via the vertical
slider and see the dvf animate. If not, then there is probably a
problem with your data (spatial offset?). You can send us the data if
you want us to have a look.
Regards,
Simon


On Sat, May 14, 2011 at 10:24 AM,  <zhangzhi at csee.ogi.edu> wrote:
> Dear VV Developer:
>
>    I would like to visualize the 2D+t sequence image registration result by
> overlaying the displacement field together with the image sequence, however,
> there is some problem that the deformation field is not visible. What I have
> done is like this:
>
> 1. I have a 2D+t image sequence image saved in a 3D(X*Y*T) mhd data set(I
> combined the image together by simply stacking frame by frame), I?load it by
> using the 'open xD image as (x-1)D+t image' and load the image in VV.
> 2. Then I use the 'add deformation field to current image' to overlay a
> deformation field also in 3D(X*Y*T). but the deformation field is not
> visible.
>
> I have tried to load the example 4D image by
> 1. file->open images and
> 2. open xD images as (x-1)D+t images
> then in the image info panel, the image size are both 144x108x42x10, and the
> green 'play' button can be used to play the sequences. However, with the 2D
> image sequence, it seems it is different.  I combined a 2D image sequence
> with 21 images and each with size 274x192 into a 3D image (a single mhd
> file).
> When I open the image file by using
> 1. file->open images, I got in the info panel a 3D image size with
> 274x192x21, and I can not play the sequence ( because the play sequence
> button is inactive). I can load a 274x192x21 vector field to overlay with
> the image, but the displacement field is not correct.
>
> 2. if I open it by "open 3D images as 2D+t images", I got in the info panel
> as 274x192x1 image and I can play it. But with this when I load a
> displacement field with size of 274x192x21 mha field data, the displacement
> field shows nothing.
>
> I wonder what is the right way to show the deformation of 2D+t sequence?
> Thank you very much for your help.
>
> regards,
> Alex
>
>
>
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