[Mristudio-users] DTIstudio on Vista potential problem

[Jonathan Farrell]

Hi Susumu

Researchers who perform DTI on the Philips MRI system can use my 
software to compute the correct gradient table for fiber tracking.  The 
tables are fully compatible with DTIstudio and CATNAP.  Also, I have 
heard of users adapting them for FSL.

A description of the software, together with Matlab files and the Java 
applet can be found on my website.  As you know, the relationship 
between the examination parameters (such as fat shift, foldover, 
overplus, scanner software release...etc) and the directions in the 
gradient table are not straightforward. 

For single cases, the JAVA applet is quite useful.  For more efficient 
processing, I would recommend the matlab files.  If you use the matlab 
code, then my program requires the .par file and a few parameters that 
are specified by the user at the command line.

http://godzilla.kennedykrieger.org/~jfarrell/software_web.htm#DTI_gradient_table_creator
http://godzilla.kennedykrieger.org/~jfarrell/OTHERphilips/GUI.html

I hope this helps.

Sincerely

- Jon

=========================================================
Jonathan Farrell

Ph.D. Candidate, Biophysics and Biophysical Chemistry
The Johns Hopkins University School of Medicine

F.M. Kirby Research Center for Functional Brain Imaging
Kennedy Krieger Institute
Baltimore, MD 21218
(443) 923-9513
========================================================= 



susumu wrote:
>
> Hi Jim,
>
>  
>
> ? Can I expect problems
>
>    on any listed vendor for any specific MRI version
>
>    on a XP laptop?  vista laptop?
>
>  
>
> > DtiStudio should be able to process all these data. Vista laptop 
> should be fine. The only issue could be memory. If you are using a 
> 32-bit XP or Vista and/or only 1GB memory, it happens frequently.
>
>  
>
> I have a vista laptop which I could use but not yet loaded,   
>
>    for any specific MRI version?
>
>  
>
> > No, XP and Vista use the same version of DtiStudio. There are 32 and 
> 64-bit versions.
>
>  
>
> ? Can anyone send me Philips gradient files
>
>   (should be 6 direction) or are they in the rec files?
>
>  
>
> No the gradient orientation is not specified in the Philips REC/PAR 
> file. Jon Farrell has a nice web-based software to make a gradient 
> table for Philips scanner based on imaging parameters and the version 
> of the operating system. Jon, could you send us the URL of your software?
>
>  
>
> I am attempting to run without success an Indiana site study
>
> **0008,0020  Study Date: 20040625**
>
> **0008,0070  Manufacturer: GE MEDICAL SYSTEMS**
>
> **0008,103E  Series Description: dti scheme9 **
>
> **0018,1020  Software Versions(s): 09 **
>
> **without imbedded gradient vectors and using Bessar normalized 
> gradients.**
>
> It loads but I get no FA map.  
>
> on a 3 yr old laptop and 2  2 yr old PCs installed in an MRI research 
> room. 
>
>  
>
> You need to get a correct gradient table because it is not always 
> available through data headers.
>
>  
>
> memory is OK,
>
> Any graphics card  requirements? 
>
>  
>
> No, DtiStudio is not graphics-heavy, but depending on the size of your 
> data, you need a decent amount of RAM.
>
>  
>
>  
>
>  
> Susumu
>