[Mrtrix-discussion] How to get the components of gradient direction for Philips PAR/REC scans

[Borich, Michael]

Hello Luis and Donald,

Thank you both for the responses.  I did come across mrtrix documentation regarding the compatibility of FSL gradient tables (which is what I was attempting to use and could be the source of the error message I received). I will check the 'transform' entry using mrinfo to determine if the real and image coordinate systems are equivalent. If not, I will try the KK Gradient Table creator. Thank you for reminding me about this code, I had forgotten about it. I will let you know if there are any further issues. Thanks again.

Best,
Michael

_____________________
Michael R. Borich, DPT, PhD
Postdoctoral Research Fellow
Brain Behavior Laboratory
University of British Columbia
212-2177 Wesbrook Mall
Vancouver, BC V6T 1Z3
phone: 604-827-3369
fax: 604-822-1870
________________________________
From: mrtrix-discussion-bounces at www.nitrc.org [mrtrix-discussion-bounces at www.nitrc.org] on behalf of Luis Concha [lconcha at gmail.com]
Sent: Monday, October 08, 2012 4:44 PM
To: mrtrix-discussion at www.nitrc.org
Subject: Re: [Mrtrix-discussion] How to get the components of gradient direction for Philips PAR/REC scans

In PAR/REC version 4.2, this is in one of the columns after the tag ===IMAGE INFORMATION===. The header of that huge table will tell you which column tells you the information (diffusion (ap, fh, rl)) and is a three-float number. Similarly, the b value is in the column labelled diff..

Luis

On Mon, Oct 8, 2012 at 6:26 PM, Donald Tournier <d.tournier at brain.org.au<mailto:d.tournier at brain.org.au>> wrote:
Hi Michael,

I've no experience with Philips PAR/REC data, but a quick Google search gives a lot of suggestions. For example, the first hit when searching for "PAR/REC Philips gradient" sounds pretty relevant:
http://godzilla.kennedykrieger.org/~jfarrell/software_web.htm#DTI_gradient_table_creator

Cheers,

Donald.


On 6 October 2012 06:33, Borich, Michael <michael.borich at ubc.ca<mailto:michael.borich at ubc.ca>> wrote:
Hello,

Is there an easy way to find out the [X Y Z] components of the gradient direction for PAR/REC images from a Philips 3T Acheiva scanner? It is no problem to get the magnitude of the directions and b value from the PAR file but I am unsure how to extract the correct component values. Thank you in advance for any information.

Best,
Michael

_____________________
Michael R. Borich, DPT, PhD
Postdoctoral Research Fellow
Brain Behavior Laboratory
University of British Columbia
212-2177 Wesbrook Mall
Vancouver, BC V6T 1Z3
phone: 604-827-3369<tel:604-827-3369>
fax: 604-822-1870<tel:604-822-1870>

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--
Dr Jacques-Donald Tournier
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The Florey Institute of Neuroscience and Mental Health
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