[Mristudio-users] Fiber-Tracking Menu Options

[Michael.Nelles at ukb.uni-bonn.de]

Hi Susumu,
thanks very much for the quick reply.

With kind regards,
M. Nelles

-------------------------------------------------------------------------------

Michael Nelles, MD
Dept. of Radiology / Neuroradiology
University of Bonn Medical Center
Sigmund Freud Str. 25,
D - 53105 Bonn, Germany
Phone: (+49) 228 287 16389
Fax: (+49) 228 287 14321
Email: michael.nelles at ukb.uni-bonn.de



                                                                           
             susumu mori                                                   
             <susumu at mri.jhu.e                                             
             du>                                                        An 
             Gesendet von:              "DTI Studio, ROI Editor, DiffeoMap 
             mristudio-users-b          Questions/Support"                 
             ounces at mristudio.          <mristudio-users at mristudio.org>,   
             org                        Hangyi Jiang <hjiang at jhmi.edu>     
                                                                     Kopie 
                                                                           
             21.04.2010 14:26                                        Thema 
                                        Re: [Mristudio-users]              
                                        Fiber-Tracking Menu Options        
              Bitte antworten                                              
                    an                                                     
             "DTI Studio, ROI                                              
                  Editor,                                                  
                 DiffeoMap                                                 
             Questions/Support                                             
                     "                                                     
             <mristudio-users@                                             
              mristudio.org>                                               
                                                                           
                                                                           




Hi Nelles,

I believe they are the same (Hangyi, correct me if I'm wrong). Usually
after tensor calculation, we save tensor-derived images such as FA,
eigenvalues, and eigenvectors. However, sometimes we save only a tensor
file to save the disc space, because as long as we save the raw tensor
file, we can re-generate all the derived images. To perform tracking, you
need to load the tensor file, calculate FA and eigenvectors, save them, and
load them again for tracking. The "using the tensor images" option save
time by eliminating these steps when you have only the tensor file. You
just load the tensor file and start tracking.

Susumu

On Wed, Apr 21, 2010 at 5:32 AM, <Michael.Nelles at ukb.uni-bonn.de> wrote:

      Hi all,

      I have questions concerning the two Fiber Tracking methods one can
      choose when starting Fiber-Tracking:
      what is the difference between tracking "using principal vector and
      FA map" and tracking "using tensor images" ?
      Are there any relevant differences of tracking results (of e.g. the
      CST) to be expected ?

      Is it true that you have to flip the z-component of the Eigen-Vector
      when processing Philips DTI data ?

      Thanks in advance !

      M. Nelles
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