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PubMed · 17029224

Dynamic coil selection for real-time imaging in interventional MRI.

Sven Müller·Reiner Umathum·Peter Speier·Sven Zühlsdorff·Sebastian Ley·Wolfhard Semmler·Michael Bock
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Abstract

MR-guided intravascular interventions require image update rates of up to 10 images per second, which can be achieved using parallel imaging. However, parallel imaging requires many coil elements, which increases reconstruction times and thus compromises real-time image reconstruction. In this study a dynamic coil selection (DCS) algorithm is presented that selects a subset of receive coils to reduce image reconstruction times. The center-of-sensitivity coordinates and the relative signal intensities are determined for each coil in a prescan. During the intervention m coils are selected for reconstruction using a coil ranking based on the distance to the current slice or catheter position. In a phantom experiment for m = 6, an optimal signal-to-background ratio (SBR) was achieved and foldover artifacts were avoided. In three animal experiments involving catheter manipulation in the aorta and the right heart chamber, the anatomy was successfully visualized at frame rates of about 5 Hz using active catheter tracking.

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AlgorithmsComputer SystemsHumansImage EnhancementImage Interpretation, Computer-AssistedImaging, Three-DimensionalMagnetic Resonance Imaging, InterventionalReproducibility of ResultsSensitivity and SpecificityJournal Article

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Sven Müller, Reiner Umathum, Peter Speier, Sven Zühlsdorff, Sebastian Ley, Wolfhard Semmler, Michael Bock. 2006. Dynamic coil selection for real-time imaging in interventional MRI.. https://doi.org/10.1002/mrm.21028

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