[Mristudio-users] Gradient Table for Philips

[susumu mori]

1) Please read your REC file using Mri3DView. Use the image dimensions you
get from the PAR file.
2) After the images are read, please go through the images using the
pull-down menu in the right column of the viewing window. Check if all the
images (b0 and DWIs) look fine.
3) Find out how many 3D images are loaded. If you used Philips "High"
gradient orientation, you should have 34 images loaded; one b0, 32 DWIs, and
one calculated DWIs (I think this is the sum of all DWIs).
4) Make sure where is b0. It could be the first or the second from the last.
The calculated DWI is always at the end.
5) Close the window and start DtiMapping.
6) Cut&Paste your gradient table to the appropriate section. You have to
make sure several things here;
a: The position of b0; First or the second from the last
b: The number of rows; It has to be 34. Sometimes you find a table with only
33 lines ignoring the last calculated image. In this case, you get the error
message, complaining that the file size doesn't match. Because the last
image is not used anyway, you can ignore the message and proceed. The last
image is thrown away. Or, you can increase the number of row to 34 by adding
33: 100, 100, 100, in which [100, 100, 100] send the message to DtiStudio to
remove this image.
c: Please make sure if you used "gradient overplus ON" or "OFF", because you
have to use different tables.
7) If you still get the file size error message, something is wrong.

On Tue, Nov 23, 2010 at 5:21 PM, Dresner, Alex <alex.dresner at philips.com>wrote:

>  Dear Chunxiao,
>
> Your gradient table is also in the .PAR file.  You should be able to read
> the .PAR file with any text reader such as WordPad, NotePad or Word; lower
> in the file is a table of parameters per-image.  On the right-hand-side of
> that table are the diffusion directions in three columns.
>
>
>
> Regards,
>
> Alex
>
>
>
> ____________________
>
> M. Alex Dresner, Ph.D.
>
> MR Clinical Scientist
>
> alex.dresner at philips.com
>
> ____________________
>
>
>
>
>
>
>
> *From:* mristudio-users-bounces at mristudio.org [mailto:
> mristudio-users-bounces at mristudio.org] *On Behalf Of *Chunxiao Zhou
> *Sent:* Tuesday, November 23, 2010 5:07 PM
> *To:* mristudio-users at mristudio.org
> *Subject:* [Mristudio-users] Gradient Table for Philips
>
>
>
> Hello,
>
>
>
> When I do tensor calculation for my own data , there is a warning message
> "File size is bigger than DW-image size, continue anyway?". I get all image
> size parameters from my .par file ( I use Philip .REC .PAR data). I guess
> the reason is that I use the default ParRec gradient table from your
> GradientTable file. How could I get my gradient table from my file?
>
>
>
> Thank you.
>
>
>
> Chunxiao(Andrew)
>
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