[Vv] Transformation matrix ?!

[a.mans at nki.nl]

Dear vv team,

for the moment, my only problem is that I cannot view my unregistered data in vv. The output of the registration package i'm using (elastix) is using the same orientation as the 'fixed' image. Reviewing registrations therefore works fine.

When you need scans for testing, you can contact me.
And say hello to Simon (old NKI collegue).

Anton
________________________________
Van: david.sarrut at gmail.com [david.sarrut at gmail.com] namens David Sarrut [David.Sarrut at creatis.insa-lyon.fr]
Verzonden: woensdag 9 februari 2011 8:17
Aan: Anton Mans
CC: vv
Onderwerp: Re: [Vv] Transformation matrix ?!

Hello Anton,

as Vivien found in the sources, Simon has indeed implemented some technique which will allow to take orientation (and any affine transformation) into account in vv.

However, it is currently disabled due to robustness reason (and potential memory leak). We plan to include it near future. When Simon will be back from his trip, we will discuss about that and may contact you if you will to participate with us to this feature.

sincerely,
David

On Tue, Feb 8, 2011 at 18:09, Vivien Delmon <vivien.delmon at creatis.insa-lyon.fr<mailto:vivien.delmon at creatis.insa-lyon.fr>> wrote:
On 02/07/2011 10:27 AM, a.mans at nki.nl<mailto:a.mans at nki.nl> wrote:
Dear vv team,

another small question:
does vv correctly use the 'global' transformation information in the image header?

My case: MR and CT scans have different orientations, which is compensated for by the transformation matrix in the .mhd image header.
CT: TransformMatrix = 1 0 0 0 1 0 0 0 1
MR: TransformMatrix = 0 1 0 0 0 -1 -1 0 0

In FSLview the images are correctly aligned. In vv, however, it seems that the transformation is not applied. Also when I modify the header file, vv still shows the same orientations.

Regards, Anton

VV doesn't take into account the direction part of the image when it converts an ITK image to a VTK image.

The problem should be fixed in these files :

common/vvFromITK.h
common/vvImage.txx

I am not sure I will have time to correct this bug soon.

Kind Regards,


--
Vivien Delmon
PhD student at CREATIS, Lyon
Supported by ANRT and ELEKTA
http://www.creatis.insa-lyon.fr/rio

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--
David Sarrut, Phd
Chargé de recherche CNRS
Laboratoire CREATIS, UMR CNRS 5220, Inserm U 1044
Centre de lutte contre le cancer Léon Bérard
28 rue Laënnec, 69373 Lyon cedex 08
Tel : 04 78 78 51 51 / 06 74 72 05 42
http://www.creatis.insa-lyon.fr/rio
_________________________________
 "2 + 2 = 5,  for extremely large values of 2"
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