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His presentation on Computer-Aided Oral Implantology can

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Key issues in Tracking<br />

• Accuracy and resoluti<strong>on</strong>: Optical trackers are<br />

rather accurate and still superior to EM probes<br />

• Reliability: A free line of sight for an optical tracker<br />

always be maintained<br />

• Handling: Trackers are cumbersome in general;<br />

passive systems have a higher acceptance rate than<br />

active (=wired) systems, but are less robust.<br />

• Sterilizability: Autoclavati<strong>on</strong> of electr<strong>on</strong>ics is difficult,<br />

ETO is expensive and time­c<strong>on</strong>suming<br />

W. Birkfellner

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