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- Title
Composition, clinical suitability and future prospects of a 0.5-T MR system for interventional use.
- Authors
Kettenbach, J.; Silverman, S. G.; Schwartz, R. B.; Hsu, L.; Koskinen, S. K.; Kikinis, R.; Black, P. McL.; Jolesz, F. A.
- Abstract
Purpose: To develop a superconducting magnetic resonance (MR) imager that provides direct access to the patient and permits interactive MR-guided interventional procedures. Materials and methods: A 0.5-T superconducting magnet that allows a region of vertical access to the patient was designed and constructed. This magnet was integrated with newly designed shielded gradient coils, flexible surface coils, nonmagnetic displays, position-monitoring probes and device-tracking instrumentation. Results: The magnet homogeneity was 12.3 ppm or better, and the gradient field was linear to within 1 % over an imaging region of 30 cm in diameter. The signal-to-noise ratio was 10 % higher than in a comparable 0.5-T superconducting imager. Images were obtained in several anatomic regions with use of routine pulse sequences. Interactive image plane selection and near real-time imaging, with use of fast gradient-recalled echo sequences were demonstrated at a rate of one image every 1.5 s. More than 240 procedures (including open brain surgery) have been successfully performed within this environment. Conclusions: MR-guided interventional and surgical procedures can be performed with full patient access using an open-configuration, superconducting MR magnet with near real-time imaging and interactive image plane control.
- Publication
Der Radiologe, 1997, Vol 37, Issue 10, p825
- ISSN
0033-832X
- Publication type
Article
- DOI
10.1007/s001170050289