My experience is that they are different for each investigation on Philips machines

nick

Niklas Lenfeldt, PhD, MSc E.P., Maj SWE A

Clinical neuroscience, Umeå university

Phone: +46706096687, +46733294165

Från: FSL - FMRIB's Software Library [mailto:[log in to unmask]] För Andreas Bartsch
Skickat: den 19 oktober 2011 21:44
Till: [log in to unmask]
Ämne: Re: [FSL] Philips DTI gradient table

Hi Tibor,

well – if you angulate your slices the bvecs >may< change. Also the effective bvecs depend on the bmatrix.

You can generate / simulate 'optimal' bvecs using camino: http://web4.cs.ucl.ac.uk/research/medic/camino/pmwiki/pmwiki.php?n=Main.HomePage

Cheers,

Andreas

Von: "Auer, Tibor M.D. Ph.D." <[log in to unmask]>
Antworten an: FSL - FMRIB's Software Library <[log in to unmask]>
Datum: Wed, 19 Oct 2011 21:35:10 +0200
An: <[log in to unmask]>
Betreff: Re: [FSL] Philips DTI gradient table

Dear Jesper,

Thank you for your fast reaction.

Are not they scanner-independent?

I just need the files required for dtifit.

Auer, Tibor M.D. Ph.D.

Biomedizinische NMR Forschungs GmbH

am Max-Planck Institut für Biophysikalische Chemie

Am Fassberg 11

37077 Göttingen

Germany

Phone/Work: +49-(0)551-201-1725

Phone/Home: +49-(0)551-387-0076

Mobile: +49-(0)176-8012-7921

Mail: [log in to unmask]

From: FSL - FMRIB's Software Library [mailto:[log in to unmask]] On Behalf Of Jesper Andersson
Sent: Wednesday, October 19, 2011 7:35 PM
To: [log in to unmask]
Subject: Re: [FSL] Philips DTI gradient table

Dear Tibor,

do you mean that you need any 32 and 16 optimal bvecs, or do you mean that you need to know specifically what bvecs your scanner uses for a certain sequence?

Jesper

On 19 Oct 2011, at 18:24, Auer, Tibor M.D. Ph.D. wrote:

Dear All,

I have started working on a Philips 3T Achieva system.

We are planning to perform DTI with a so-called “Jones”-sequence. I am not sure whether it is only a preset factory or a special sequence.

The real question is that I need bvecs file for the analysis (bvals is obvious J). Could someone send me bvecs for 32 (high) and 16 (medium) directions?

Thanks,