[Mristudio-users] To Philips Users

[susumu mori]

Here are important facts about Philips data;

1) You can control the number of b0 images (say 5 b0). However, no matter
how many b0 you take, you get only 1 b0 image in the file (they are already
averaged).
2) The final appended image is a calculated "isotropically
diffusion-weighted image" (I believe). I'm not sure exactly how it is
created. Maybe simply a sum of all DWIs. You don't use this image for tensor
calculation. As you mentioned, in DtiStudio, you remove it by using [100,
100, 100].
3) The order of b0, DWI, and the appended iso-DWI can be specified in the
console. In the past, the default order was b0 - DWIs - iso, but in newer
versions of operating system, you may get a file with DWIs-b0-iso order.

Hope it helps.

Susumu

On Wed, Sep 30, 2009 at 11:50 AM, [Seongjin] <choisj70 at gmail.com> wrote:

> Dear Philips users among DTI studio users,
> DTI data (from a scanner) consists of b=0 image, other DWIs corresponding
> to the number of gradients and one more extra image.
> Anyone knows the details of the extra image from the scanner? In DTI
> studio, it's gradient table is 100, 100, 100. Typically it comes last in the
> data set.
> It looks like a averaged image of all other DWIs. However, it looks
> different from the mean of all DWIs generated from DTI Studio.
>
> Thanks in advance.
>
> -SC
>
>
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