[Insight-users] Regarding AnalyzeImageIO

[Vincent A. Magnotta]

Srivalli,

Currently there is not a standard use for the glmin, glmax, cal_min and
cl_max values in the Analyze 7.5 format. Many programs including analyze
ignore these values and some programs use these values to set a global
scale for the images. You can get these values set by running the itk
MinimumMaximumImageCalculator and getting the min and max values for the
image. Then you will need to set the following meta data values for the
image:

ANALYZE_CAL_MAX
ANALYZE_CAL_MIN
ANALYZE_GLMAX
ANALYZE_GLMIN

The resulting analyze image should then contain valid information for
MRIcro in these fields. 

This may solve all or a portion of your problem. I am not sure what you
mean by distorted. Is it only the dynamic range that is a problem or are
there other issues as well.

Vince


On Mon, 2004-03-08 at 06:44, valli gummadi wrote:
>  Hi All,
> 
>          My requirement is to convert MR volume from one view to another view. Original MR is in Coroanl View and I want it to convert into Axial View. I used ITKOrientImageFilter.  My input volume is Analyze format.I used AnalyzeImageIO to read and write input and output images. 
> The problem is in output image intensities are not scaled properly. Gloam max and Global Mon are not set. Both are 0s. When i opened the output image in MRIcro, I got the following message.
> "The header may not be compatible with SPM,The image intensity scale is zero. "
> But,It could open the image after giving message. Image is  bit distorted. 
> Can anybody tell me the reason for this.
> 
> thanks,
> Regards,
> Srivalli.
-- 
Assistant Professor
Department of Radiology
0437 JCP
E-mail: vincent-magnotta at uiowa.edu
Phone: 319-356-8255
Fax: 319-353-6275
Website: http://www.radiology.uiowa.edu