Hi Jorg,

I think the Siemens tfl (MPRAGE) sequence automatically sets the TE to the lowest possible value consistent with the choosen bandwidth, gradient mode, and performance of your gradient set.

In all likelihood, I'm guessing that the value was still less than 4 ms on your system, right?

cheers, -MH

On Mon, 2012-05-14 at 09:46 -0400, Bruce Fischl wrote:

Hi Jörg

T1-weighted image contrast decreases with increasing TE so you want to minimize it. Can you really not change it at all? I've never heard of that. Whas is the default TE?

cheers Bruce

On Mon, 14 May 2012, Jörg Pfannmöller wrote:

...

Dear freesurfers,

currently the freesurfer single tfl protocol for the segmentation of the cortex surface was implemented at our scanner.

Siemens Verio 3T MRT NumarisVer syngo MR B17 Gradientensystem (Tim 102x8) VQ-Engine

Unfortunately the echo-time (te) could not be set to the recomended value of 3.31ms. The te is defined by the system and can not be changed. Is this critical for the segmentation quality?

Sincerely yours

        A MRT-Physician

---

Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

_______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.