Abstract
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. Magn Reson Med 63:1070-1079, 2010.
Original language | English (US) |
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Pages (from-to) | 1070-1079 |
Number of pages | 10 |
Journal | Magnetic resonance in medicine |
Volume | 63 |
Issue number | 4 |
DOIs | |
State | Published - May 2010 |
Externally published | Yes |
Keywords
- Active devices
- Interventional MRI
- Parallel MRI
- Projection imaging
- Real-time MRI
- Visualization
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging