[Mristudio-users] To Philips Users

[Seongjin]

Susumu,

Thanks for your answer to my question.To me the appended image in the last
place looks like an averaged image, but it look different from the mean of
all DWIs generated by DTI Studio. So the origin or feature of the appended
image is still not clear.

Based on this, using the mean of all DWIs generated by DTI Studio would be
better for intra-individual registration (built-in AIR) template, I guess.

Do you have any opinion to this intra-individual registration approach?

-SC


On Fri, Oct 2, 2009 at 3:55 PM, susumu mori <susumu at mri.jhu.edu> wrote:

> 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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