Visualization of active devices and automatic slice repositioning ("SnapTo") for MRI-guided interventions.


Journal Article

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 three-dimensional trajectory of the device from projection images in a fraction of a second. CurveFind is an iterative prediction-correction 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.

Full Text

Cited Authors

  • George, AK; Derbyshire, JA; Saybasili, H; Saikus, CE; Kocaturk, O; Guttman, MA; McVeigh, ER; Lederman, RJ; Faranesh, AZ

Published Date

  • April 2010

Published In

Volume / Issue

  • 63 / 4

Start / End Page

  • 1070 - 1079

PubMed ID

  • 20373408

Pubmed Central ID

  • 20373408

Electronic International Standard Serial Number (EISSN)

  • 1522-2594

International Standard Serial Number (ISSN)

  • 0740-3194

Digital Object Identifier (DOI)

  • 10.1002/mrm.22307


  • eng