[vtkusers] Extract only bones or other tissues from a Ct

[wassim_belhadj at topnet.tn]

Hi ,

Thank you for your advice and help

As i told my problem is that values of bones pixels and other tissues
arethe same on my CT data sets.

I tried to use an opacity transfer function  (I tested a lot of values) to
do that but I didn't have a satisfactory result
 
       ==>I have not been able to extract only bones

I would note that I used a vtkRayCastVolumeMapper...

How can I get a result similar to OSIRIX  using a complex CT  data sets?

I tested many examples provided with VTK (VRT, Medical,...) but I have not
found something that can help me.

I am stuck ...

Waiting for your Help and thank you very much.

Regards


On Wed, 10 Sep 2008 14:22:28 +0200, "Michael Knopke"
<Michael.Knopke at gmx.de> wrote:
> Hi,
> 
> The screenshot just shows a normal volume rendering of ct data using a
> very
> well defined transfer function.
> Also I guess the dataset used for it is quite good (lots of images as
> source
> and a young patient) so separation of tissues can easily be done using
> transfer functions.
> 
> Osirix uses the vtkFixedPointVolumeMapper and the vtkRayCastVolumeMapper
> for
> this kind of rendering. (Softwarerenderer with high quality)
> 
> I recommend to look at the examples provided with VTK.
> 
> If you want your users to interactively change what tissues they see you
> need some kind of widget that gives the possibility to change the
> TransferFunction.
> 
> Unfortunately there is no such widget in VTK, but in a separate toolkit,
> so
> you might consider this:
> 
> 
> 
> http://www.kwwidgets.org/Wiki/Image:KWWidgetsTourExample.png
> 
> 
> 
> If you just want VRT than leave out ITK as it adds a lot of complexity to
> your program. (different programming paradigm)
> 
> Regards,
> 
> 
> 
> Michael