[Insight-users] MultiResMIRegistration : Inconsistency in Multiple runs

[Dhiral Phadke]

Hi,
  
  I am executing the MultiResMIRegistration software with the following parameter file: 
  
  Axialsaggre711-05082006.img
  interpolatedPerfusion711-05082006.img
  0 1 2
  0 0 0
  5
  4 4 1
  8 8 1
  2500 2500 2500 2500 2500
  1e-6 1e-6 5e-6 5e-6 5e-7
  320
  Reg_perfusion711-05082006.img
  
  I ran the same script a few times and observed that in each run the  values of the Final Parameters and the Overall transform matrix in the  output were quite different. The Overall Tranform set seems reasonably  close though. For example: 
  
  Run 1: 
  
  Final parameters: [-0.00351486, 0.000741038, 0.000685894, 0.999993, 0.533468, -2.82873, 1.43219]
  Overall transform matrix: 
  0.999998 -0.00137699 0.00147724
  0.00136657 0.999974 0.00703069
  -0.00148689 -0.00702866 0.999974
  
  Overall transform offset: 
  [40.5209, -3.84145, -95.5383]
  ===========================================================
  Run 2: 
  
  Final parameters: [-0.00274307, 0.00195265, -0.000717365, 0.999994, -1.14514, -1.45365, 2.23317]
  Overall transform matrix: 
  0.999991 0.00142401 0.00390921
  -0.00144543 0.999984 0.0054833
  -0.00390134 -0.0054889 0.999977
  
  Overall transform offset: 
  [38.1756, -2.02425, -94.7227]
  
  What is the reason for this inconsitency? How can this be solved?
  
  Thanks a lot in advance. 
  
  Sincerely,
  Dhiral Phadke.
  
 		
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