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open-discussion > RE: How to convert dicom files from fielmap
Oct 17, 2012 04:10 PM | Scott Hoge
RE: How to convert dicom files from fielmap
Originally posted by Benjamin Albrecht:
To generate a distortion correction (field) map, you do need the phase information from two images acquired at different TE. The default format for Siemens DICOM images is to store only the magnitude information. If you have the raw data (from the meas.dat file---pulled from TWIX), you can regenerate the phase images offline in ICE. If not, you'll need to reacquire the field map images.
HTH.
Scott
Hello everyone,
I got fMRI data acquired by a Siemens Trio 3T. These data contain also 40 files from a gradient field sequence. When I convert these 40 dicom files in SPM8 I get only one image. And I wanted to use these data for unwarping. But as I understood it correct I need two images, a magnitude and a phase image. Therefore my question: Do I have to convert the images in another way or how can I fix this problem.
Thank you
Benji
I got fMRI data acquired by a Siemens Trio 3T. These data contain also 40 files from a gradient field sequence. When I convert these 40 dicom files in SPM8 I get only one image. And I wanted to use these data for unwarping. But as I understood it correct I need two images, a magnitude and a phase image. Therefore my question: Do I have to convert the images in another way or how can I fix this problem.
Thank you
Benji
To generate a distortion correction (field) map, you do need the phase information from two images acquired at different TE. The default format for Siemens DICOM images is to store only the magnitude information. If you have the raw data (from the meas.dat file---pulled from TWIX), you can regenerate the phase images offline in ICE. If not, you'll need to reacquire the field map images.
HTH.
Scott
Threaded View
| Title | Author | Date |
|---|---|---|
| Benjamin Albrecht | Oct 17, 2012 | |
| Scott Hoge | Oct 17, 2012 | |
| Benjamin Albrecht | Oct 18, 2012 | |