Yes. You can specify b-values in the gradient table of DtiStudio.<div>I believe you can just append the b-value, like 0: 1, 0, 0, 500<br><br><div class="gmail_quote">On Mon, Feb 7, 2011 at 12:54 PM, Castaneda, Salvador <span dir="ltr"><<a href="mailto:salvador.castaneda@med.uni-tuebingen.de">salvador.castaneda@med.uni-tuebingen.de</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div>
<div dir="ltr" align="left"><span><font face="Arial" color="#0000ff" size="2">Hello Susumu,</font></span></div>
<div dir="ltr" align="left"><span><font face="Arial" color="#0000ff" size="2"></font></span> </div>
<div dir="ltr" align="left"><span><font face="Arial" color="#0000ff" size="2">Thank you for your reply. Things are clearer now. I have
run some phantom measurements on the 7 tesla MR i'm using for these animal
measurements, and have also found this distortion from the eddy current, I
assume. So i think that the AIR somehow also helps correct that in this case. I
think that I will continue using the AIR...</font></span></div>
<div dir="ltr" align="left"><span><font face="Arial" color="#0000ff" size="2">I have used diffeomap and ROI editor but still am on a
learning process...</font></span></div>
<div dir="ltr" align="left"><span><font face="Arial" color="#0000ff" size="2">I had another question. Are you able to evaluate more than
one 0 and 1000 b value. Are you able to analize multiple B
values?</font></span></div>
<div dir="ltr" align="left"><span><font face="Arial" color="#0000ff" size="2"></font></span> </div>
<div dir="ltr" align="left"><span><font face="Arial" color="#0000ff" size="2">All the best to your and your group.</font></span></div>
<div dir="ltr" align="left"><span><font face="Arial" color="#0000ff" size="2"></font></span> </div>
<div dir="ltr" align="left"><span><font face="Arial" color="#0000ff" size="2">Salvador</font></span></div>
<div dir="ltr" align="left">
<hr>
</div>
<div dir="ltr" align="left"><font face="Tahoma" size="2"><b>Von:</b>
<a href="mailto:mristudio-users-bounces@mristudio.org" target="_blank">mristudio-users-bounces@mristudio.org</a>
[mailto:<a href="mailto:mristudio-users-bounces@mristudio.org" target="_blank">mristudio-users-bounces@mristudio.org</a>] <b>Im Auftrag von </b>susumu
mori<br><b>Gesendet:</b> Freitag, 4. Februar 2011 16:50<br><b>An:</b> DTI
Studio, ROI Editor, DiffeoMap Questions/Support<br><b>Betreff:</b> Re:
[Mristudio-users] tensor calculation<br></font><br></div><div><div></div><div class="h5">
<div></div>Hi Salvador,
<div><br></div>
<div>AIR/MI registration is a common procedure for human MRI because of two
reasons. First, they tend to move (more than 1 pixel). Second, human scanners
have larger eddy current, which shifts and deforms the images. To remove
these registration errors, we use the co-registration tools. I believe
it is not necessary for animal studies because they are sedated and heads are
fixed.</div>
<div><br></div>
<div>After the co-registration process, we inevitably apply pixel interpolation,
which reduces resolution and enhances SNR. So, that could be one of the reasons
why the images look different. I guess if you skip the registration, the images
look much similar.</div>
<div><br></div>
<div>Just one note; we have DiffeoMap and RoiEditor you can download from <a href="http://www.mristudio.org" target="_blank">www.mristudio.org</a>, which allows you to do
cross-contrast and cross-animal registration.</div>
<div><br></div>
<div>Susumu<br><br>
<div class="gmail_quote">On Thu, Feb 3, 2011 at 10:09 AM, Castaneda, Salvador
<span dir="ltr"><<a href="mailto:salvador.castaneda@med.uni-tuebingen.de" target="_blank">salvador.castaneda@med.uni-tuebingen.de</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="padding-left:1ex;margin:0px 0px 0px 0.8ex;border-left:#ccc 1px solid">
<div>
<div dir="ltr" align="left"><span><font face="Arial" color="#0000ff" size="2">Hello Mri
studio users,</font></span></div>
<div dir="ltr" align="left"><span><font face="Arial" color="#0000ff" size="2"></font></span> </div>
<div dir="ltr" align="left"><span><font face="Arial" color="#0000ff" size="2">I am
working with a MRI scanner with bruker hardware and siemens software. I
acquire mosaic files and have been able to work with the mosaic in DTI studio
to then do a AIR registration. I produce whatever maps i need. It works great.
I then, upload the maps created by DTI studio to another imaging software
called PMOD, as Analize files, for coregistration with a T2W rat brain
Anatomy image. I am able produce good quality ROIs of the brain areas i
need. Just recently i have discovered, that the MR can also provide for
me the FA, TRACE, DWI, and ADC maps as DICOMs. These I can also upload to Pmod
for coregistration with the anatomy. So theoretically I can choose to do this,
but i have noticed that the quality of the maps produced by the MR software
are somehow "lacking". So my question is : Is the AIR and mutual image
registration in DTI studio crutial for the processing of the data from the MR?
I like the images produced by DTI studio better, but what is the basis of the
improvement? how is it different to the images calculated by the MR?
The MR software is Siemens Syngo. I know that DTI studio also provides
tractography which makes a better tool for this analisis, but if i would be
just interested inthe FA maps, are the images produced by the scanner enough?
(regarding affine coregistration)</font></span></div>
<div dir="ltr" align="left"><span><font face="Arial" color="#0000ff" size="2">thanks in
advance for your responses. </font></span></div>
<div dir="ltr" align="left"><span><font face="Arial" color="#0000ff" size="2"></font></span> </div><font color="#888888">
<div dir="ltr" align="left"><span><font face="Arial" color="#0000ff" size="2">Salvador</font></span></div></font></div><br>_______________________________________________<br>mristudio-users
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