Thanks, I will try that. It seems like the plastic material of the phantom is contaminated with some magnetic impurities...<br><br>Inna<br><br><div class="gmail_quote">On Mon, Jan 28, 2013 at 2:44 PM, Tom Holroyd (NIH/NIMH) [E] <span dir="ltr"><<a href="mailto:tomh@kurage.nimh.nih.gov" target="_blank">tomh@kurage.nimh.nih.gov</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">With no fluid I would hazard a guess that you are seeing building vibration. Try just putting a stiff wire under the helmet and see what kind of vibration you get.<div class="im HOEnZb">
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<br>
McGowin, Inna wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Yes,<br>
I run all kind of scans: noise test (good), disconnected phantom (noisy), phantom with dipole removed (noisy), phantom with saline solution removed (noisy); dipole alone (good), saline alone (good).<br>
</blockquote>
<br></div><span class="HOEnZb"><font color="#888888">
-- <br>
The white knight is talking backwards.</font></span><div class="HOEnZb"><div class="h5"><br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>Inna McGowin<br>