Hi All,

I just wanted to let you know about a change to the units that the TR is reported in for SOME data when converting from Siemens DICOM to analyze or bshort using unpacksdcmdir or mri_convert. I expect that this will have no effect on anyone, but I think it's a good idea to let people know, just in case.

First, this does not effect functional data, which is generally the only time software would automatically read and use the TR. For analyze and bshort functional data, the TR has been and will be stored in seconds.

There will be a change for non-functional data -- specifically, data whose images are not stored as mosaics in the Siemens DICOM file, but only when this data are stored in analyze or bshort formats. For these data the TR value was stored in milliseconds. It will now be stored in seconds (again only in analyze and bshort). This will have no effect on FreeSurfer reconstructions.

For those in the NMR Center, this change has already been incorporated into the NMR standard and development environments. Those who run FreeSurfer and unpacking externally will be affected by the next release.

Like I said, I don't think this will affect anyone, but if you think it affects you or need clarification, please let me know.

thanks

Doug