MRI-guided needle localization in the head and neck using contemporaneous imaging in an open configuration system

Background. MRI-guided procedures have previously been limited by technical difficulties, including the need for MRI-compatible instruments, slow image acquisition time, and the closed nature of conventional MRI scanners. The development of open configuration MRI systems with in-room, contemporaneous imaging has greatly increased the potential for MRI-guided interventional procedures. We evaluate our clinical experience applying this technology to the head and neck. Methods. An open design 0.2T magnet combined with an in-room monitor was used for 24 MRI-guided needle localization procedures in the head and neck. Success of the procedures was based on the ability to accurately position the instrument in the target region to allow biopsy or treatment. Results. In all 24 cases placement of the instrument within the target tissue was successful. Conclusion. MRI-guided needle- localization procedures in an open design magnet with in-room, contemporaneous image monitoring offer advantages over previous conventional interventional MRI systems by allowing interactive guidance with near real- time imaging feedback. As a result, procedure time is reduced and accuracy of instrument positioning is increased. (C) 2000 John Wiley and Sons, Inc.