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MR‐guided intravascular procedures: Real‐time parameter control and automated slice positioning with active tracking coils
Author(s) -
Bock Michael,
Volz Steffen,
Zühlsdorff Sven,
Umathum Reiner,
Fink Christian,
Hallscheidt Peter,
Semmler Wolfhard
Publication year - 2004
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.20044
Subject(s) - scanner , computer science , orientation (vector space) , subtraction , catheter , pulse sequence , magnetic resonance imaging , interface (matter) , biomedical engineering , computer vision , radiology , medicine , nuclear medicine , artificial intelligence , geometry , mathematics , arithmetic , bubble , maximum bubble pressure method , parallel computing
Purpose To implement and optimize a real‐time pulse sequence and user interface to perform intravascular interventions using active catheter tracking. Materials and Methods In magnetic resonance (MR)‐guided interventions, small radio‐frequency coils can be used to rapidly determine the device position (active tracking). In this work, active catheter tracking was combined with a dedicated real‐time pulse sequence and user interface. The pulse sequence offered the imaging contrasts fast low angle shot (FLASH), true Fast imaging with steady state precession (TrueFISP), and projection MR digital subtraction angiography (MR‐DSA), which could be selected by the radiologist from within the scanner room at any time during the intervention. Automatic slice positioning was added to the real‐time pulse sequence so that the location of the tracking coils defined the image slice position and orientation. The technique was assessed in phantoms and animal experiments. Results At a reaction time of 24 msec and a frame rate of three images per second, the movement of an active intravascular catheter could be monitored in the aorta and the renal arteries of a pig. With interactive contrast and orientation changes, the renal vasculature could be assessed by a fully MR‐guided catheterization in less than 10 minutes. Conclusion With carefully designed active catheters, a dedicated user interface, and an optimized pulse sequence intravascular interventions can successfully be performed by a single operator from within the MR scanner room. J. Magn. Reson. Imaging 2004;19:580–589. © 2004 Wiley‐Liss, Inc.