[Insight-users] Problem with Analyze format

[Benjamin King]

Hi Radhika,


> There appears to be a problem with the Analyze format. When I read in an
> unsigned 16 bit integer data, and write it out in Analyze format, the 
> header that goes with the .img file appears incompatible so I cannot 
> view it

I experience a similar behaviour when I try to open ITK's Analyze files in 
e.g. VolView. I fix the header by first opening the file with MRIcro 
(http://www.psychology.nottingham.ac.uk/staff/cr1/mricro.html). Then in 
the Header->Information dialog, set the field G_Max to something other 
than 0, e.g. 4095 (which is the maximum for 12bit unsigned int data). 
Finally save the header overwriting the old one. VolView can now read and 
display the file.

For another software package, I also have to change the scale field (on 
the MRIcro main window just below the endianess display) to something 
greater than 0.

If you'd like to know more about the Analyze format, you may refer to 
http://www.dclunie.com/medical-image-faq/html/part5.html or 
http://www.mayo.edu/bir/PDF/ANALYZE75.pdf


cheers,
   Benjamin

-- 
Benjamin King
Institut für Medizinische Informatik
Medizinische Hochschule Hannover
Tel.: +49  511  532-2663