No, I don't have anything which allows you to specify them yourself. On
the other hand, you can work-around this with something like:
mri_probedicom --i slice1.dcm --o slice1.dat
slice1.dat will be a binary file of the pixel data from the file
slice1.dcm. You can do this for each slice, then assemble the data into
a real format. Not fun, but possible. Other tools out there might not
require the direction cosines.
doug
Niels Bergsland wrote:
Hi Doug,
Thanks for the quick response. These are for single images. These
older files are missing 0020,0032 (ImagePositionPatient) and 0020,0037
(ImageOrientationPatient). It is my understanding that 20,37 is used
to establish the direction cosines. The scans were all acquired in
the axial plane. Is it possible to 'fake' the 20,37 field by
inserting the values: 1\0\0\0\1\0 ? We also know which way the
slices are supposed to be sorted, is it possible to insert values into
20,32 in order to have freesurfer able to 'know' the proper sorting
order?
As I said in my first email, I am afraid not... But I figured it would
not hurt to ask.
Thanks!
Cheers,
Niels
On 8/28/06, Doug Greve <[EMAIL PROTECTED]> wrote:
Which diom tags do you mean? I think we can get away with not having the
Patient Orientation (tag 20,20) -- I'm not sure why I required it in the
first place. ImagePositionPatient (tag 20,32) is considerably more
important as this is one of the ways the slices are sorted and the
direction cosines estabilished. Are these for mosaics?
doug
Niels Bergsland wrote:
> Hi,
> We have some old scans that were originally in ACR-NEMA format which
> we have converted to DICOM. The problem is that they are missing both
> the ImagePositionPatient and ImageOrientationPatient fields. Is
> there anyway to use freesurfer without having these two fields? Based
> on the post by Doug which I found at
>
http://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg03409.html
> , I am afraid not...
>
> Thank you for any help.
> Regards,
> Niels Bergsland
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> Freesurfer@nmr.mgh.harvard.edu
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>
>
--
Douglas N. Greve, Ph.D.
MGH-NMR Center
[EMAIL PROTECTED]
Phone Number: 617-724-2358
Fax: 617-726-7422
In order to help us help you, please follow the steps in:
surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
--
Douglas N. Greve, Ph.D.
MGH-NMR Center
[EMAIL PROTECTED]
Phone Number: 617-724-2358
Fax: 617-726-7422
In order to help us help you, please follow the steps in:
surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
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