Oh, I see. Our sample data are very old. Please don't worry about it if you are just practicing the software.<div>It was caused by poor calibration of the scanner back then. It's not because something is wrong with your calculation.<br>
<br><div class="gmail_quote">On Thu, Feb 21, 2013 at 9:19 PM, Durai Arasan <span dir="ltr"><<a href="mailto:durai23@gmail.com" target="_blank">durai23@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
thanks Dr Mori, but the data is from the mristudio tutorial. so i am definitely wrong somewhere. increasing the threshold seems to get rid of the artifacts but i am losing information as well.<div><br></div><div>maybe i should use a image mask while calculating ADC?</div>
<div><br></div><div><br><div class="gmail_quote">On Thu, Feb 21, 2013 at 9:02 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">
If this artifact appears reproducible, you'd better contact your scanner manufacturer and show the image.<div>This half-field-of-view ghost is usually caused by poor calibration scan and phase correction for the EPI data acquisition. We always have this ghost in DTI, which uses EPI, but with much less degree.<br>
<br><div class="gmail_quote"><div><div>On Thu, Feb 21, 2013 at 8:42 PM, Durai Arasan <span dir="ltr"><<a href="mailto:durai23@gmail.com" target="_blank">durai23@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>
hi,<br><div class="gmail_quote"><div><br></div><div>just started using this amazing software. </div><div><br></div><div>my adc map has consistent artifacts (calculated with b-val = 700 thresh = 10) as shown in attached image.</div>
<div><br></div><div>
this is probably something trivial, as i am using the sample data provided in the tutorial with default values. can someone point out whats wrong?<br><br></div><div>thanks</div><span><font color="#888888"><span><font color="#888888"><div>
durai</div>
</font></span></font></span></div><br>
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