<div dir="ltr">These artifacts are very common, caused by B0 susceptibility.<div>The way to reduce this artifact is;</div><div>> Use the smallest matrix size. Instead of 256mm/128points, use 224mm/112points or 192mm/96points. All give 2mm resolution. The smaller the matrix size, the less distortion.</div>
<div>> Use parallel imaging (SENSE, GRAPPA, ASSET)</div><div>> 1.5T has less distortion. 7T is the worst.</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Aug 23, 2013 at 12:09 PM, Ajay Garg <span dir="ltr"><<a href="mailto:drajaygarg@gmail.com" target="_blank">drajaygarg@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear All,<br>
<br>
I face 2 probelms in my DTI data acquired on philips 3T scanner (32<br>
dir, 2 averages, SENSE factor 2.5) using 32-channel head coils-<br>
1. Artefacts around brainstem<br>
2. Flattening on pons<br>
<br>
I am using TE value of minimum selected by scanner + 5ms i.e. around 80ms.<br>
<br>
Thanks for all support.<br>
Ajay<br>
AIIMS<br>
<br>
--<br>
Dr Ajay Garg<br>
Additional professor<br>
Department of Neuroradiology<br>
Neurosciences Centre<br>
All India Institute of Medical sciences (A.I.I.M.S)<br>
Ansari Nagar,<br>
New Delhi<br>
India- PIN 110029<br>
<br>
E-mail:<br>
<a href="mailto:ajaygarg1971@yahoo.com">ajaygarg1971@yahoo.com</a><br>
<a href="mailto:drajaygarg@gmail.com">drajaygarg@gmail.com</a><br>
<br>
Fax: 0091-11-26588641, 26588663<br>
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</blockquote></div><br></div>