[Mristudio-users] how to save the transformation matrix from alandmarker based transformation

[Yi Jiang]

Hi Dr Mori,

Thank you very much. Andreia and Xin have helped me to make it work.

I have another question. I am wondering if you have suggestion or software about averaging eigenvectors or tensors. In other words, if we have, say, DTI dataset of 10 brains, all registered together, how can we calculate the mean (and variation) of the 10 primary eigenvector field or calculate the mean (and variation) of the 10 tensor field?

Any suggestion is highly appreciated!

Yi
 
  ----- Original Message ----- 
  From: susumu mori 
  To: Yi Jiang ; DTI Studio, ROI Editor, Landmarker Questions/Support ; Xin Li ; ANDREIA FARIA 
  Sent: Tuesday, August 04, 2009 9:59 PM
  Subject: Re: [Mristudio-users] how to save the transformation matrix from alandmarker based transformation


  Hi Yi,

  I believe you can save the matrix. Xin should know how to do it.
  As for the matrix combination, I remember that we discussed about exactly the same topic in my lab. I thought that answer was Yes, but don't exactly remember how to do it. Andreia and Xin, do you know how to do it?


  On Tue, Aug 4, 2009 at 4:31 PM, Yi Jiang <yj3 at duke.edu> wrote:

    Dear All,

    I have tried to look through the online manual, but could not find the answer.

    I tried to use the landmark based transformation (translation) from the main menu of the Landmarker window. The result is pretty good. However, I do not know how to save the transformation matrix. I tried to click the "save transformation matrix" button in the subject window. It seems two files was saved (.hdr? and .dat), but the file sizes were very small.

    I also want to combine the transformation matrix from the landmark based translation with a AIR linear rigid, a AIR linear affine transformation, and a LDDMM matrix. Can I do that? I do not know if the transformation matrix from landmark based translation is a AIR format, or LDDMM raw format, or a LDDMM vtk format, which was asked in the combine matrix window.

    The last question may be stupid: if there are defined landmarks in the memory, when I click on AIR linear or multichannel LDDMM (not from the main menu, but the buttons in the subject window), those landmarks were not used in transformation, right?

    Thank you very much!

    Best,
    Yi




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