Hi
i think, that after running the sequence on the scanner, when you choose how
many directions you want for DT reconstruction, the gradient vectors appear
below in the window.
Best wishes
Thomas
----- Original Message -----
From: "Kingsley, Peter" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, July 05, 2007 11:55 AM
Subject: Re: [SPM] Siemens Avanto gradient directions...
Gonzalo and David:
This document seems to give Siemens' original 12 directions. I have also
seen a different set at recent ISMRM meetings where, instead of each set
containing the numbers {1, +/-0.5, 0}, it contains the numbers {1, +/-0.414,
+/-0.414} (or their exact negatives, which is equivalent for diffusion) or
something close to that. I don't know if this set was provided by Siemens,
or if it was produced by the research group. It provides similar spacing
with a slightly greater vector magnitude. If Siemens now provides this
modified set, you need to find out if you have the old set or the new set.
You should try to get your exact gradient directions from DICOM headers, or
from Siemens.
[Also, in this document the 6-direction set is from cube edges, not the
icosahedron. The 10-direction set is not the standard one, but may be a
rotated version of it.]
-----
Peter B. Kingsley, PhD, MRI Physicist [log in to unmask]
Department of Radiology / MRI
North Shore University Hospital
300 Community Drive, Manhasset, NY 11030, USA
Tel (516) 562-2842 Fax (516) 562-3561
-----Original Message-----
From: SPM (Statistical Parametric Mapping) [mailto:[log in to unmask]] On
Behalf Of David Garcia-Garcia
Sent: Wednesday, July 04, 2007 4:21 AM
To: [log in to unmask]
Subject: Re: [SPM] Siemens Avanto gradient directions...
Hi!
You can get all gradient directions tables for Siemens equipment here:
http://www.bic.mni.mcgill.ca/~ilana/diffusion/WIP_ep2d_diff.pdf
Cheers
Gonzalo Rojas escribió:
> Hi:
>
> Could you please send me the gradient directions table for a Siemens
> Avanto MRI equipment ?...
>
> Sincerely,
>
>
>
> Gonzalo Rojas Costa
> Laboratory of Medical Image Processing
> Department of Neuroradiology
> Institute of Neurosurgery Dr. Asenjo
> Jose Manuel Infante 553, Providencia, Santiago, Chile.
> Tel/Fax: 56-2-2003290
> Cel: 56-9-7771785
> www.neurorradiologia.cl
>
David García García <[log in to unmask]>
Unidad de Trastornos de Memoria. Neurologia
Clinica Universitaria de Navarra
Pamplona (Spain)
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