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.
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.
Authors: Yacine Noureddine; Andreas K Bitz; Mark E Ladd; Markus Thürling; Susanne C Ladd; Gregor Schaefers; Oliver Kraff Journal: MAGMA Date: 2015-09-26 Impact factor: 2.310
Authors: Laleh Golestanirad; Boris Keil; Leonardo M Angelone; Giorgio Bonmassar; Azma Mareyam; Lawrence L Wald Journal: Magn Reson Med Date: 2016-04-05 Impact factor: 4.668
Authors: Laleh Golestanirad; Leonardo M Angelone; Maria Ida Iacono; Husam Katnani; Lawrence L Wald; Giorgio Bonmassar Journal: Magn Reson Med Date: 2016-10-31 Impact factor: 4.668
Authors: Marcel Prothmann; Florian von Knobelsdorff-Brenkenhoff; Agnieszka Töpper; Matthias A Dieringer; Etham Shahid; Andreas Graessl; Jan Rieger; Darius Lysiak; C Thalhammer; Till Huelnhagen; Peter Kellman; Thoralf Niendorf; Jeanette Schulz-Menger Journal: PLoS One Date: 2016-02-10 Impact factor: 3.240
Authors: Oliver Weinberger; Lukas Winter; Matthias A Dieringer; Antje Els; Celal Oezerdem; Jan Rieger; Andre Kuehne; Antonino M Cassara; Harald Pfeiffer; Friedrich Wetterling; Thoralf Niendorf Journal: PLoS One Date: 2016-09-06 Impact factor: 3.240