Re: [Freesurfer] Fwd: DTI questions

Sorry, motion was my best guess.

On Sun, 30 Jun 2013, Rotem Saar wrote:

Dear Anastasia,

The T1 images were acquired in a sagittal orientation, and the DTI images in an axial orientation. Does this help ?

Thanks

Rotem

2013/6/25 Anastasia Yendiki ayendiki@nmr.mgh.harvard.edu

  Hi Rotem - No problem. Were these scans by any chance acquired
  with a coronal slice prescription? In the axial views that you
  sent, the artifact that you're pointing to looks like
  misalignment between consecutive coronal slices, which could be
  due to head motion.

  a.y

  On Tue, 25 Jun 2013, Rotem Saar wrote:

        Dear Anastasia,
         
        I tried several times to upload these images in a
        non-compressed way, but
        they were too big and my posts were rejected, with
        no opportunity for any
        other upload way.
        Is there any other way for me to upload it so that
        everyone can see it ?
         
        Attached are the images in a non-compressed fashion.
        I will be very happy if
        u will have a look, and post your answer to me and
        the list to save some
        time, until I will be able to consider another way
        to upload them.
         
        I know that we should write to all the list, but at
        the moment if the images
        are not visible this won't help - so I will really
        appreciate if u will have
        a look but also tell me what is the best way to
        upload them so that all list
        members will be able to see them.
         
        Thank u very much for your help.
         
        Rotem

        2013/6/25 Anastasia Yendiki
        <ayendiki@nmr.mgh.harvard.edu>

              Sorry, can't open the image.

              On Sun, 23 Jun 2013, Rotem Saar wrote:

                    Hi there,

                    Long time:). Well I wrote to the list
        several times
                    regarding high FA values
                    I got when performing DTI analysis.
                    Today we know that the problem was an
        additional
                    direction (we had 17
                    directions instead of 16 - we used a
        Philips
                    scanner,1.5T). So we deleted
                    the additional slices and the high
        values indeed
                    disappeared, but then
                    another problem came up (tried several
        subjects so
                    the problem is not
                    specific to a subject) -

                    I noticed an artifact that I can't
        explain - please
                    see the attached
                    pictures.

                    This artifact existed even before I
        deleted the
                    additional slices, also - I
                    see the artifact also when loading the
        masked
                    volume...It is cyclic - run
                    over all slices...

                    any ideas ?
                     
                    I'm using version 5.2 and I know the
        command lines
                    are correct (send it to u
                    in the past).

                    Thanks for your help

                    Rotem




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