No subject

no perceived latency issues. As to refresh rate, the MedSafe refresh rate w=
as 160Hz and did not depend on the number of tools used. For the Aurora the=
 refresh rate was 40Hz when using one tool and dropped to 20-25Hz when usin=
g multiple tools. This was still good enough for most of our applications. =
Also, NDI has informed us that this issue has since been resolved and that =
the refresh rate is 40Hz even when all tools are connected (we haven't =
tested this). For all the details please see the paper:<br>

<br>
&quot;Electromagnetic Tracking in the Clinical Environment&quot;, Z. Yaniv,=
 E. Wilson, D. Lindisch, K. Cleary, Med. Phys., Vol. 36(3), pp. 876-892, 20=
09.<br>
<br>
 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 regards<br>
 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Ziv<br>
<br>
Jia Fucang wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"border-left: 1px solid rgb(204, =
204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div><div></div><=
div class=3D"h5">
Hi all,<br>
<br>
We are going to buy one electronic magnetic tracking system, currently only=
<br>
NDI Aurora and Ascension 3D Guidance medSAFE are in consideration. But I no=
ticed<br>
that there are a word says that &quot;medSAFE has observable delay when tra=
cking multiple tool&quot;,<br>
when will it occur? with how much tracking tools?<br>
<br>
The current surgery we are working is spine surgery, and during the navigat=
ion two or three<br>
tools are in tracking in one time.<br>
<br>
Thank you for any hints.<br>
<br>
Best,<br>
Fucang<br>
<br>
<br></div></div>
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</blockquote>
<br>
<br>
-- <br>
Ziv Yaniv, PhD., Research Assistant Professor<br>
Imaging Science and Information Systems (ISIS) Center<br>
Department of Radiology<br>
Georgetown University Medical Center<br>
2115 Wisconsin Avenue, Suite 603<br>
Washington, DC, 20007,<br>
<br>
Phone: +1-202-687-7286<br>
Fax: +1-202-784-3479<br>
email: <a href=3D"mailto:zivy at isis.georgetown.edu" target=3D"_blank">zivy at i=
sis.georgetown.edu</a><br>
web: <a href=3D"http://isiswiki.georgetown.edu/zivy/" target=3D"_blank">htt=
p://isiswiki.georgetown.edu/zivy/</a><br>
</blockquote></div><br>

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