 |
 |
The question I would have, based on the numbers you showed, is whether Bruker's calculation of the effective b-value is accurate. I raise this because if you requested a nominal b-value of 1000, and you're getting putative effective b-values of 1200 - 1330, that doesn't seem right. As point of reference, for the HCP, where our nominal b-values are 1000, 2000, and 3000, we get deviations from those of only 10-15 for the effective b-values calculated by Siemens.
cheers,-MH
--Michael Harms, Ph.D.-----------------------------------------------------------Conte Center for the Neuroscience of Mental DisordersWashington University School of MedicineDepartment of Psychiatry, Box 8134660 South Euclid Ave. Tel: 314-747-6173
From: David Gutman <[log in to unmask]>
Reply-To: FSL - FMRIB's Software Library <[log in to unmask]>
Date: Wednesday, January 29, 2014 9:48 AM
To: FSL - FMRIB's Software Library <[log in to unmask]>
Subject: Re: [FSL] Bval and Bvecs on bruker
It's better to use the actual applied BVALS--- especially since some of them deviate from the nominal value ( 1000 ) by quite a bit..
On Wed, Jan 29, 2014 at 10:40 AM, Manuel Blesa <[log in to unmask]> wrote:
Hi Barbara,
The information about the bvecs was very usefull. Thanks
I have more one question: in the bvals, I have to write the nominal value (the input of the scanner: 0 0 0 1000 1000...) or the effective value (that is obtained from the file: 11.015 11.015 11.015 1319.003 1196.645 1334.212...)? I think the second option is more accurate, but I'm not sure.
The method file is from the Bruker data, a file with all the parameters that you used.
Best regards,
Manuel Blesa
--
David A Gutman, M.D. Ph.D.
Assistant Professor of Biomedical Informatics
Senior Research Scientist, Center for Comprehensive Informatics
Emory University School of Medicine
The materials in this message are private and may contain Protected Healthcare Information or other information of a sensitive nature. If you are not the intended recipient, be advised that any unauthorized use, disclosure, copying or the taking of any action in reliance on the contents of this information is strictly prohibited. If you have received this email in error, please immediately notify the sender via telephone or return mail.