Hi David,
they are not. DSI needs many samples with multiple gradient directions and b-values. In theory, you need to sample the whole q-space and then Fourier transform the measurements, to obtain the diffusion scatter pattern. On the contrary, for the most commonly used DTI acquisitions, only a sphere of q-space is sampled, by varying the direction of the diffusion gradient.
Cheers,
Stam
On 25 Oct 2010, at 16:53, David Gutman wrote:
> Are the acquisition parameters for DSI otherwise identical to say a
> 60-direction DTI sequence? I thought they were quite similar-- but
> never had dug into the details to see if it simply using our "DTI"
> data and using a different analysis/reconstruction algorithm with
> essentially the same data?
>
>
>
>
> On Mon, Oct 25, 2010 at 9:27 AM, kochunov <[log in to unmask]> wrote:
>> I'd suggest you use MGH dti sequence for this as it is superior to the
>> Siemens DTI sequence.
>> pk
>> -----Original Message-----
>> From: FSL - FMRIB's Software Library [mailto:[log in to unmask]] On Behalf
>> Of David Gutman
>> Sent: Monday, October 25, 2010 8:26 AM
>> To: [log in to unmask]
>> Subject: [FSL] Question about DSI on Siemens..
>>
>> This is a bit off topic.. but does anyone have any experience
>> collecting DSI data on a Siements 3T Tim Trio? We are interested in
>> comparing DTI and DSI data.. and our current scanner doesn't have a
>> DSI protocol installed and we were debating the feasibility of
>> implementing it at Emory...
>>
>>
>>
>> dg
>>
>> --
>> David A Gutman, M.D. Ph.D.
>> Center for Comprehensive Informatics
>> Emory University School of Medicine
>>
>
>
>
> --
> David A Gutman, M.D. Ph.D.
> Center for Comprehensive Informatics
> Emory University School of Medicine
>
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