[vtkusers] MIP & CT-data handling

[Wolfram H Volpi]

vtk is rather limited in the typs of files it can read.
vtkBMPReader vtkPNMReader vtkTIFFReader 

To convert data to a vtk readable format see dicom2.  It is a free
command-line driven program which allows you to convert medical images and
DICOM files to various other formats.
http://www.hds.utc.fr/~barre/medical/dicom2/index.html

Good luck,
Wolfv.

On Mon, 13 Nov 2000, Markus Heller wrote:

> Dear list members,
> 
> I'm trying to use the maximum intensity projection features
> of VTK to simulate an X-ray image based on CT-data. 
> 
> I tried to modify e.g. the volSimple.tcl example in
> the graphics/examplesTcl/ directory, i.e. I changed the
> reader from the SLCreader to a vtkImageReader. 
> The ImageReader is set to read a few slices from the
> Visible Human frozen CT-data set:
> 
> vtkImageReader Ireader        
>         Ireader SetHeaderSize 3416
>     	Ireader SetDataExtent 0 511 0 511 1720  1820 
>     	[Ireader GetOutput] SetOrigin 0.0 0.0 0.0
>     	Ireader SetDataByteOrderToBigEndian
>     	Ireader SetFilePrefix "./VisibleHuman/FrozenCT/c_vm"
>         Ireader SetFilePattern "%s%d.fro"
>     	Ireader SetDataSpacing 0.9375 0.9375 1.0        
>         Ireader Update
> 
> It seems that the output from the image reader has not the
> data type that the "vtkVolumeRayCastMapper" can handle, since
> the following error message is issued:
> 
> "The scalar data type: 4 [seems to be vtk short] is not
> supported when volume rendering. Please convert the data
> to unsigned char or unsigned short."
> 
> Now, how could I perform this conversion ??? 
> 
> 
> In addition that question, I'd like to know what approaches
> other list members use to save modified ct data. There seem
> to be some "misalignments" in the VH frozen CT data set. I'd like
> to adjust the data for that and save it in the aligned form for
> further processing or select and save a volume of interest.
> 
> 
> Greetings,
> 
> 
> Markus
> 
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