title: Modeling Endovascular MRI Coil Coupling With Transmit RF Excitation.
abstract: To model inductive coupling of endovascular coils with transmit RF excitation for selecting coils for MRI-guided interventions.
  
  
  
  Independent and computationally efficient FEM models are developed for the endovascular coil, cable, transmit excitation, and imaging domain. Electromagnetic and circuit solvers are coupled to simulate net B1+ fields and induced currents and voltages. Our models are validated using the Bloch-Siegert B1+ mapping sequence for a series-tuned multimode coil, capable of tracking, wireless visualization, and high-resolution endovascular imaging.
  
  
  
  Validation shows good agreement at 24-, 28-, and 34-μT background RF excitation within experimental limitations. Quantitative coil performance metrics agree with simulation. A parametric study demonstrates tradeoff in coil performance metrics when varying number of coil turns. Tracking, imaging, and wireless marker multimode coil features and their integration is demonstrated in a pig study.
  
  
  
  Developed models for the multimode coil were successfully validated. Modeling for geometric optimization and coil selection serves as a precursor to time consuming and expensive experiments. Specific applications demonstrated include parametric optimization, coil selection for a cardiac intervention, and an animal imaging experiment.
  
  
  
  Our modular, adaptable, and computationally efficient modeling approach enables rapid comparison, selection, and optimization of inductively coupled coils for MRI-guided interventions.
authors.forename: Madhav
authors.initials: M
authors.lastname: Venkateswaran
authors.forename: Orhan
authors.initials: O
authors.lastname: Unal
authors.forename: Samuel
authors.initials: S
authors.lastname: Hurley
authors.forename: Alexey
authors.initials: A
authors.lastname: Samsonov
authors.forename: Peng
authors.initials: P
authors.lastname: Wang
authors.forename: Sean B
authors.initials: SB
authors.lastname: Fain
authors.forename: Krishna N
authors.initials: KN
authors.lastname: Kurpad
mesh_terms: D017076:Computer-Aided Design; D057510:Endovascular Procedures / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007089:Image Enhancement / Q000295:instrumentation; D060526:Magnetic Fields; D053783:Magnetic Resonance Imaging, Interventional / Q000295:instrumentation*; D008280:Magnetics / Q000295:instrumentation*; D019047:Phantoms, Imaging; D012542:Scattering, Radiation; D014159:Transducers; D059015:Wireless Technology / Q000295:instrumentation*