On the RF heating of coronary stents at 7.0 Tesla MRI
Corresponding Author
Lukas Winter
Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrueck Center for Molecular Medicine, Berlin, Germany
Correspondence to: Lukas Winter, Dr.rer.nat., Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrueck Center for Molecular Medicine, Robert-Roessle-Strasse 10, 13125 Berlin, Germany. E-mail: [email protected]Search for more papers by this authorEva Oberacker
Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrueck Center for Molecular Medicine, Berlin, Germany
Search for more papers by this authorCelal Özerdem
Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrueck Center for Molecular Medicine, Berlin, Germany
Search for more papers by this authorYiyi Ji
Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrueck Center for Molecular Medicine, Berlin, Germany
Search for more papers by this authorFlorian von Knobelsdorff-Brenkenhoff
Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrueck Center for Molecular Medicine, Berlin, Germany
Experimental and Clinical Research Center (ECRC), a joint cooperation between the Charité Medical Faculty and the Max-Delbrueck Center for Molecular Medicine, Berlin, Germany
Search for more papers by this authorGerd Weidemann
Physikalisch Technische Bundesanstalt (PTB), Braunschweig and Berlin, Germany
Search for more papers by this authorBernd Ittermann
Physikalisch Technische Bundesanstalt (PTB), Braunschweig and Berlin, Germany
Search for more papers by this authorFrank Seifert
Physikalisch Technische Bundesanstalt (PTB), Braunschweig and Berlin, Germany
Search for more papers by this authorThoralf Niendorf
Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrueck Center for Molecular Medicine, Berlin, Germany
Experimental and Clinical Research Center (ECRC), a joint cooperation between the Charité Medical Faculty and the Max-Delbrueck Center for Molecular Medicine, Berlin, Germany
Search for more papers by this authorCorresponding Author
Lukas Winter
Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrueck Center for Molecular Medicine, Berlin, Germany
Correspondence to: Lukas Winter, Dr.rer.nat., Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrueck Center for Molecular Medicine, Robert-Roessle-Strasse 10, 13125 Berlin, Germany. E-mail: [email protected]Search for more papers by this authorEva Oberacker
Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrueck Center for Molecular Medicine, Berlin, Germany
Search for more papers by this authorCelal Özerdem
Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrueck Center for Molecular Medicine, Berlin, Germany
Search for more papers by this authorYiyi Ji
Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrueck Center for Molecular Medicine, Berlin, Germany
Search for more papers by this authorFlorian von Knobelsdorff-Brenkenhoff
Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrueck Center for Molecular Medicine, Berlin, Germany
Experimental and Clinical Research Center (ECRC), a joint cooperation between the Charité Medical Faculty and the Max-Delbrueck Center for Molecular Medicine, Berlin, Germany
Search for more papers by this authorGerd Weidemann
Physikalisch Technische Bundesanstalt (PTB), Braunschweig and Berlin, Germany
Search for more papers by this authorBernd Ittermann
Physikalisch Technische Bundesanstalt (PTB), Braunschweig and Berlin, Germany
Search for more papers by this authorFrank Seifert
Physikalisch Technische Bundesanstalt (PTB), Braunschweig and Berlin, Germany
Search for more papers by this authorThoralf Niendorf
Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrueck Center for Molecular Medicine, Berlin, Germany
Experimental and Clinical Research Center (ECRC), a joint cooperation between the Charité Medical Faculty and the Max-Delbrueck Center for Molecular Medicine, Berlin, Germany
Search for more papers by this authorAbstract
Purpose
Examine radiofrequency (RF) induced heating of coronary stents at 7.0 Tesla (T) to derive an analytical approach which supports RF heating assessment of arbitrary stent geometries and RF coils.
Methods
Simulations are performed to detail electromagnetic fields (EMF), local specific absorption rates (SAR) and temperature changes. For validation E-field measurements and RF heating experiments are conducted. To progress to clinical setups RF coils tailored for cardiac MRI at 7.0T and coronary stents are incorporated into EMF simulations using a human voxel model.
Results
Our simulations of coronary stents at 297 MHz were confirmed by E-field and temperature measurements. An analytical solution which describes SAR(1g tissue voxel) induced by an arbitrary coronary stent interfering with E-fields generated by an arbitrary RF coil was derived. The analytical approach yielded a conservative estimation of induced SAR(1g tissue voxel) maxima without the need for integrating the stent into EMF simulations of the human voxel model.
Conclusion
The proposed analytical approach can be applied for any patient, coronary stent type, RF coil configuration and RF transmission regime. The generalized approach is of value for RF heating assessment of other passive electrically conductive implants and provides a novel design criterion for RF coils. Magn Reson Med 74:999–1010, 2015. © 2014 Wiley Periodicals, Inc.
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