[Freesurfer] need clarification of analyze 7.5 format orient value

[Yasunari Tosa]

I need the clarification of analyze 7.5 format in sagittal flipped
case.   I just found that it is different from
the one I used for freesurfer.   I used Graham version from his web
site:

wideman-one.com/gw/brain/analyze/formatdoc.htm has


  
    
      hist.orient
      Mayo name
      Voxel[Index0,
Index1, Index2] 
    
    
      Index0
      Index1
      Index2
    
    
      0 (default)
      transverse unflipped
      R-L
      P-A
      I-S
    
    
      1
      coronal unflipped
      R-L
      I-S
      P-A
    
    
      2
      sagittal unflipped
      P-A
      I-S
      R-L
    
    
      3
      transverse flipped
      R-L
      A-P
      I-S
    
    
      4
      coronal flipped
      R-L
      S-I
      P-A
    
    
      5
      sagittal flipped
      P-A
      S-I
      R-L
    
    
      Note:
Index0 is fastest-varying (innermost-nested) index, Index2 the
outermost. 
Index0..Index2 are often called X, Y, Z, but I am trying to avoid
confusion with spatial coordinates.  
    
  


I found that  http://nifti.nimh.nih.gov/dfwg/nifti_revised.html has

 vs. qform_code: The ANALYZE-7.5 format
indicated 3D orientation with the 1 byte code orient, which
was to be interpreted as

  
    
      
        0 = transverse-unflipped
         R→L P→A I→S
      
      
        1 = coronal-unflipped
         R→L I→S P→A
      
      
        2 = sagittal-unflipped
         P→A I→S R→L
      
      
        3 = transverse-flipped
         R→L A→P I→S
      
      
        4 = coronal-flipped
         R→L S→I P→A
      
      
        5 = sagittal-flipped
         P→A I→S L→R
      
    
  

Note that the second and third axis of "sagittal flipped" are flipped
;-)

Tosa
-- 
Yasunari Tosa, Ph.D.
R&D Engineer				email: [EMAIL PROTECTED]
Mass. General Hospital NMR Center	phone:  		
Building 149
13th Street			        fax  :
Charlestown, MA 02129



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