Visualization of active devices and automatic slice repositioning (“SnapTo”) for MRI-guided interventions
✍ Scribed by Ashvin K. George; J. Andrew Derbyshire; Haris Saybasili; Christina E. Saikus; Ozgur Kocaturk; Michael A. Guttman; Elliot R. McVeigh; Robert J. Lederman; Anthony Z. Faranesh
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 689 KB
- Volume
- 63
- Category
- Article
- ISSN
- 0740-3194
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✦ Synopsis
The accurate visualization of interventional devices is crucial for the safety and effectiveness of MRI-guided interventional procedures. In this paper, we introduce an improvement to the visualization of active devices. The key component is a fast, robust method (''CurveFind'') that reconstructs the threedimensional trajectory of the device from projection images in a fraction of a second. CurveFind is an iterative predictioncorrection algorithm that acts on a product of orthogonal projection images. By varying step size and search direction, it is robust to signal inhomogeneities. At the touch of a key, the imaged slice is repositioned to contain the relevant section of the device (''SnapTo''), the curve of the device is plotted in a three-dimensional display, and the point on a target slice, which the device will intersect, is displayed. These features have been incorporated into a real-time MRI system. Experiments in vitro and in vivo (in a pig) have produced successful results using a variety of single-and multichannel devices designed to produce both spatially continuous and discrete signals. CurveFind is typically able to reconstruct the device curve, with an average error of approximately 2 mm, even in the case of complex geometries.