[vtkusers] Re: [Spam:5] [Insight-users] converting medical images from unsigned short to unsigned char

[Stephen R. Aylward]

Most analog image display are driven by 8bit a-to-d converters, so you 
won't notice a degradation in image quality on your monitor if you 
display the image using 8 bits.  However, since the recorded range of MR 
images is generally higher, you need to allow the user the ability to 
specify window and level settings for converting the MR recorded 
intensities into displayed intensities.

ITK provides the GLSliceView class and the ImageViewer application to 
demonstrate how to do this mapping/display using GL.

VTK has the vtkImagePlaneWidget that provides interactive window and 
level settings and the display of 3D images.   You can easily pipe your 
ITK image to it using the VTKToITK functions demonstrated in the 
InsightApplications subdir.

Stephen


Mark Wyszomierski wrote:
> Hello all,
> 
> I have some motion corrected (courtesy of ITK) image data taken from MRI images.
> I wanted to display these images using VTK, namely display the images
> as texture maps on a quad for hardware acceleration. These routines in
> VTK (vtkImageActor) only accept image data of type unsigned char as
> input.
> 
> Is it valid to rescale the original MRI data which is of type unsigned
> short into an unsigned char data range for display? Won't this be
> altering the original image data?
> 
> Thanks,
> Mark
> _______________________________________________
> Insight-users mailing list
> Insight-users at itk.org
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-- 
===========================================================
Dr. Stephen R. Aylward
Associate Professor of Radiology
Adjunct Associate Professor of Computer Science and Surgery
http://caddlab.rad.unc.edu
aylward at unc.edu
(919) 966-9695