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Abstract #3150

Performance and Accuracy of a Morphological MR Marker Localization at Reduced Spatial Resolutions: Results from Simulated and Real Marker Images

Gregor Thrmer1, Nikita Garnov1, Jrgen Haase2, Thomas Kahn1, Michael Moche1, Harald Busse1

1Diagnostic and Interventional Radiology, Leipzig University Hospital, Leipzig, Germany; 2Physics and Geosciences Department, Leipzig University, Leipzig, Germany

MR-visible markers have many potential applications such as an automated mapping of coordinate systems (image/patient registration), stereotactic planning/monitoring of procedures, and the localization/tracking of devices inside the magnet. In this work, precision, accuracy and update rates of a fully automatic marker localization based on morphologic image processing have been studied experimentally as well as theoretically (simulation) as a function of the underlying pixel size. The moderate 3D errors (1 mm) observed for the fastest sequence (pixel dimension 4.7 mm) clearly demonstrate that the presented technique does not necessarily require highly resolved images of the markers (physical dimension 4 mm).