<div dir="ltr"><div><div><div>Thanks Dr. Susumu.<br><br></div>So for taking the exact correct gradient table, for example I should extract gradient table from DICOM files using DTI studio having the option called (Get gradient from DICOM file header) or gradient file from the scanner. Since i have the discrepancy between gradient file obtained from scanner provided by manufacturer and extracted from DICOM file header using DTIstudio. Which one is more accurate?<br>
<br></div>With best Regards,<br><br></div>Santosh<br><div><div><br><br><div><br><br></div></div></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Apr 12, 2013 at 4:10 PM, susumu mori <span dir="ltr"><<a href="mailto:susumu@mri.jhu.edu" target="_blank">susumu@mri.jhu.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi Santosh,<div><br></div><div>If the gradient table is wrong, all calculation would be wrong.</div><div>
There is a mistake that could be corrected after the calculation but it is only when the +/- sign of entire column (say, y-component column) of the table is wrong. In this case, I think FA/MD are not affected but the vector signs are flipped. So you can flip the sign of the y-components before tracking. This rule is, however, no longer valid when you do gradient table rotation for oblique-imaging or you rotate the image for image registration.</div>
<div> </div></div><div class="gmail_extra"><br><br><div class="gmail_quote"><div><div class="h5">On Fri, Apr 12, 2013 at 6:28 PM, Santosh Yadav <span dir="ltr"><<a href="mailto:santoshyadav20076@gmail.com" target="_blank">santoshyadav20076@gmail.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><div dir="ltr">
<p style="margin-bottom:12pt;line-height:normal"><span style="font-size:12pt;font-family:"Times New Roman","serif"">Hi Dr. Susumu,</span></p>
<p style="margin-bottom:12pt;line-height:normal"><span style="font-size:12pt;font-family:"Times New Roman","serif"">I have one question regarding gradient table in calculation
of DTI metric and fiber tractography.</span></p>
<p style="margin-bottom:0.0001pt;line-height:normal"><span style="font-size:12pt;font-family:"Times New Roman","serif"">Is gradient table have only effect on
fiber tractography and doesn’t affect ADC and FA values, Is this correct? <br></span></p>
<p style="margin-bottom:0.0001pt;line-height:normal"><span style="font-size:12pt;font-family:"Times New Roman","serif"">With best Regards, <br></span></p>
<p style="margin-bottom:0.0001pt;line-height:normal"><span style="font-size:12pt;font-family:"Times New Roman","serif"">Santosh</span></p>
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