usually, that is caused by a mismatch between the number of images and the gradient table you specified.<div><br></div><div>For example, if your gradient table consists of 6 orientations and your data have 12 diffusion-weighted images, DtiStudio can't calculate a tensor.</div>
<div><br></div><div>If you are using the regular Siemens table, it should be a 12-orientation scheme. After you load the image, find how many b0 and diffusion-weighted images are loaded. Then confirm if it matches to the number of orientations of the table you used.</div>
<div><br></div><div>The video tutorial in <a href="http://www.mristudo.org">www.mristudo.org</a> may help.<br><br><div class="gmail_quote">On Tue, Feb 1, 2011 at 5:42 PM, Felix Beacher <span dir="ltr"><<a href="mailto:felixbeacher@hotmail.co.uk">felixbeacher@hotmail.co.uk</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div>
<span style="font-family:Tahoma, Verdana, Arial, sans-serif;color:rgb(42, 42, 42)">Hello!<div style="line-height:17px"><br style="line-height:17px"></div><div style="line-height:17px">I am trying to get started with my first DTI analysis but have come across an early-stage problem with tensor calculation. </div>
<div style="line-height:17px"><br style="line-height:17px"></div><div style="line-height:17px">I have loaded my data (Siemens DICOM, FA) and I am in the DTI mapping tab. The data looks as if it has loaded OK. However, when I hit the 'Original-ADC-STD-Mean' button I get an error message saying 'an invalid argument was encountered' followed by a blank screen saying 'image not ready'.</div>
<div style="line-height:17px"><br style="line-height:17px"></div><div style="line-height:17px">Can anyone help with this?</div><div style="line-height:17px"><br style="line-height:17px"></div><div style="line-height:17px">
Many thanks</div><div style="line-height:17px"><br style="line-height:17px"></div><div style="line-height:17px">Felix</div></span><div style="text-indent:0px !important"><span><div><font face="Tahoma"><span><br></span></font></div>
<div style="line-height:17px;font-family:Tahoma, Verdana, Arial, sans-serif;font-size:10pt"><br></div></span></div><br><br> </div>
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