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Radiology, Vol 197, 485-488, Copyright © 1995 by Radiological Society of North America

ARTICLES

Real-time biplanar needle tracking for interventional MR imaging procedures

DA Leung, JF Debatin, S Wildermuth, N Heske, CL Dumoulin, RD Darrow, M Hauser, CP Davis and GK von Schulthess
Department of Radiology, Zurich University Hospital, Switzerland.

PURPOSE: To evaluate real-time biplanar tracking of a specially designed needle with magnetic resonance (MR) imaging guidance. MATERIALS AND METHODS: The needle is made of polyetheretherketone and has a miniature radio-frequency coil incorporated into the tip. Tracking software on two workstations is used to compute three- dimensional coordinates of the coil and to display the position as a moving symbol in two imaging planes. Validation of needle tracking was performed in a harvested human liver. T2-weighted fast spin-echo images were used to target a 1-cm cyst. Success of needle placement was confirmed with aspiration and with updated gradient-recalled-echo images. RESULTS: The cyst was successfully targeted from different approaches. Tracking procedures were monitored in real time simultaneously on two separate images. CONCLUSION: Real-time biplanar needle tracking may prove to be useful for both diagnostic and therapeutic interventional MR imaging procedures.


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