Keywords: MR-Guided Interventions, MR-Guided Interventions, needle intervention, percutaneous intervention, needle tracking, needle localization, device tracking, passive tracking, modelling
Motivation: For MR-guided needle interventions, rapid 3D needle localization enables automatic realignment of 2D real-time imaging slices with the device during the procedure.
Goal(s): To investigate a model-based approach for rapid 3D needle localization that does not require prepositioned tracking slices.
Approach: 3D k-space data was radially acquired before and after needle placement. Two algorithms to extract position and orientation of the needle were introduced and compared (artifact model fit to undersampled subtraction k-space/image).
Results: Model-based rapid 3D needle localization was successfully demonstrated in-vivo (k-space-based offline localization error 4.3mm for FOV of (256cm)3 in 1.1s combined acquisition and localization time using 64 k-space spokes).
Impact: Model-based rapid 3D passive needle localization shows potential to improve the workflow of MR-guided needle interventions, allowing for automatic alignment of 2D real-time imaging slices with the needle trajectory.
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