An in silico testbed for fast and accurate MR labeling of orthopedic implants

  1. Gregory M Noetscher  Is a corresponding author
  2. Peter J Serano
  3. Marc Horner
  4. Alexander Prokop
  5. Jonathan Hanson
  6. Kyoko Fujimoto
  7. James Brown
  8. Ara Nazarian
  9. Jerome Ackerman
  10. Sergey N Makaroff
  1. Electrical & Computer Eng. Dept, Worcester Polytechnic Institute, United States
  2. Ansys, United States
  3. Dassault Systèmes Deutschland GmbH, Germany
  4. Neva Electromagnetics, LLC, United States
  5. GE HealthCare, United States
  6. Micro Systems Enigineering, Inc, an affiliate of Biotronik, United States
  7. Musculoskeletal Translational Innovation Initiative, Department of Orthopedic Surgery, Beth Israel Deaconess Medical Center and Harvard Medical School, United States
  8. Harvard Medical School, United States
  9. Athinoula A Martinos Center for Biomed. Imaging, Massachusetts General Hospital, United States
5 figures and 1 additional file

Figures

Visible Human Project (VHP)-Female Model with Embedded Passive Implants.

Left (a) – surface CAD meshes for the Visible Human Project (VHP)-Female model (with some muscles removed for purposes of visualization); and right – examples of passive femoral implants embedded …

Left – Visible Human Project (VHP)-Female computational phantom positioned within a 1.5 T MRI birdcage coil at the abdominal landmark.

Right – power loss density in W/m3 in the coil for the (b) Austin Moore and (c) femoral nail implants.

Ansys Workbench modeling workflow consisting of the HFSS (electromagnetic) module labeled as A and B, and the transient thermal module labeled D.

Thermal material properties are contained in module C.

Top – long femoral nail subject to three repetitions of 15 min exposure followed by 5 min of rest for 1 hr in total.

Center – temperature contour plot in a cut plane roughly bisecting the embedded femoral implant at the end of the last heating cycle. Bottom – temperature rise profile at the temperature probe. Only …

Liver experiment setup: E-field distribution in the plane of the resonant loop and specific absorption rate (SAR) distribution within liver in a plane passing through the tip of the lead.

Bottom left – lesion in a section of ex vivo bovine liver created with heating at the tip of a 16 gauge (1.3 mm) bare copper wire needle in about 1.5 min (Hue et al., 2018).

Additional files

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