Accurate 3D localization of biopsy needles during MR-guided interventions is especially challenging due to time restrictions in real-time workflows. While active tracking methods rely on additional RF-sensitive hardware, rapid passive tracking methods often make use of markers or prior knowledge regarding the needle location. In an ex-vivo study, we investigated a novel passive tracking method using heavily undersampled, radial acquisitions in combination with contrast-optimized White Marker imaging and CNN image postprocessing regarding its potential to speed up passive needle artifact localization without the use of additional hardware or prior knowledge on the needle location.
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