Hi Ziv,<br><br>Thank you very much for your evaluation for EM tracking system. Now I am clear<br>no it and I will read the paper first.<br><br>Best,<br>Fucang<br><br><div class="gmail_quote">On Wed, Nov 4, 2009 at 10:54 PM, Ziv Yaniv <span dir="ltr"><<a href="mailto:zivy@isis.imac.georgetown.edu">zivy@isis.imac.georgetown.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi Fucang,<br>
<br>
>From our evaluation (done about 1.5 years ago) both Aurora and MedSafe had no perceived latency issues. As to refresh rate, the MedSafe refresh rate was 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 using 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>
"Electromagnetic Tracking in the Clinical Environment", Z. Yaniv, E. Wilson, D. Lindisch, K. Cleary, Med. Phys., Vol. 36(3), pp. 876-892, 2009.<br>
<br>
regards<br>
Ziv<br>
<br>
Jia Fucang wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div><div></div><div class="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 noticed<br>
that there are a word says that "medSAFE has observable delay when tracking multiple tool",<br>
when will it occur? with how much tracking tools?<br>
<br>
The current surgery we are working is spine surgery, and during the navigation 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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-- <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>
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email: <a href="mailto:zivy@isis.georgetown.edu" target="_blank">zivy@isis.georgetown.edu</a><br>
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