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Abstract #4421

MRPen 3D Marker Tracking for Percutaneous Interventions

Florian Maier1, Axel Joachim Krafft1, Andr de Oliveira2, Wolfhard Semmler1, Michael Bock1

1Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany; 2Healthcare Sector, Siemens AG, Erlangen, Germany

In percutanous MR-guided interventions passive markers are used to delineate the position or the trajectory of rigid instruments, e.g. needles. In this work, a modified passive marker and a modified passive tracking pulse sequence are proposed. Based on the 3D position and rotation of the marker an imaging slice is automatically adjusted in real time. Measurements indicate that the marker design combined with the pulse sequence allows an accurate rotation estimation and 3D tracking of rigid instruments. Thus, the choice of an optimal needle trajectory in percutaneous interventions is highly facilitated and under manual control of the operator.