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Accelerating implant RF safety assessment using a low-rank inverse update method. | LitMetric

AI Article Synopsis

  • Patients with metallic medical implants, such as orthopaedic implants and pacemakers, often can't safely undergo MRI exams due to risks like tissue heating from radio frequency (RF) fields.* -
  • This study develops a faster computational method for assessing RF safety of implants by calculating the impact of implants on RF fields, using a library of RF responses and low-rank matrix updates.* -
  • The new method demonstrated a high level of accuracy with a maximum error of just 1.35% and was 171 to 2478 times quicker than traditional methods, allowing for more efficient and tailored MRI scanning conditions.*

Article Abstract

Purpose: Patients who have medical metallic implants, e.g. orthopaedic implants and pacemakers, often cannot undergo an MRI exam. One of the largest risks is tissue heating due to the radio frequency (RF) fields. The RF safety assessment of implants is computationally demanding. This is due to the large dimensions of the transmit coil compared to the very detailed geometry of an implant.

Methods: In this work, we explore a faster computational method for the RF safety assessment of implants that exploits the small geometry. The method requires the RF field without an implant as a basis and calculates the perturbation that the implant induces. The inputs for this method are the incident fields and a library matrix that contains the RF field response of every edge an implant can occupy. Through a low-rank inverse update, using the Sherman-Woodbury-Morrison matrix identity, the EM response of arbitrary implants can be computed within seconds. We compare the solution from full-wave simulations with the results from the presented method, for two implant geometries.

Results: From the comparison, we found that the resulting electric and magnetic fields are numerically equivalent (maximum error of 1.35%). However, the computation was between 171 to 2478 times faster than the corresponding GPU accelerated full-wave simulation.

Conclusions: The presented method enables for rapid and efficient evaluation of the RF fields near implants and might enable situation-specific scanning conditions.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7003873PMC
http://dx.doi.org/10.1002/mrm.28023DOI Listing

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