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Abstract #3834

Highly Undersampled Radial Passive Marker Tracking with Phase-only Cross-Correlation (POCC) for Real Time Image Guidance

Andreas Reichert1, Simon Reiss1, Michael Bock1, Michael Vogele2, and Axel Joachim Krafft1

1Department of Radiology, Medical Physics, Medical Center ‐ University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany, 2Interventional Systems GmbH, Kitzbuehel, Austria

Marker tracking with phase-only cross correlation (POCC) is an efficient technique to localize instruments during percutaneous MR-guided interventions in closed-bore MR systems. Unfortunately, POCC is time-consuming, as additional marker images need to be continuously acquired. Here, we present a drastically accelerated POCC sequence that uses radially undersampled images to detect the passive marker. With a modified POCC algorithm this sequence can detect marker movements within less than 108ms thus providing a very fast position feedback. The precision of the POCC sequence was evaluated in phantom measurements, and a possible in vivo targeting scenario was demonstrated in a volunteer.

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