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

Peter R.S. Stijnman (Corresponding author), Janot P. Tokaya, Jeroen van Gemert, Peter R. Luijten, Josien P.W. Pluim, Wyger M. Brink, Rob F. Remis, Cornelis A.T. van den Berg, Alexander J.E. Raaijmakers

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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.

Originele taal-2Engels
Pagina's (van-tot)1796-1809
Aantal pagina's14
TijdschriftMagnetic Resonance in Medicine
Volume83
Nummer van het tijdschrift5
DOI's
StatusGepubliceerd - 1 mei 2020

Vingerafdruk

Radio
Safety
Magnetic Fields
Heating
Libraries
Orthopedics

Citeer dit

Stijnman, Peter R.S. ; Tokaya, Janot P. ; van Gemert, Jeroen ; Luijten, Peter R. ; Pluim, Josien P.W. ; Brink, Wyger M. ; Remis, Rob F. ; van den Berg, Cornelis A.T. ; Raaijmakers, Alexander J.E. / Accelerating implant RF safety assessment using a low-rank inverse update method. In: Magnetic Resonance in Medicine. 2020 ; Vol. 83, Nr. 5. blz. 1796-1809.
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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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Stijnman, PRS, Tokaya, JP, van Gemert, J, Luijten, PR, Pluim, JPW, Brink, WM, Remis, RF, van den Berg, CAT & Raaijmakers, AJE 2020, 'Accelerating implant RF safety assessment using a low-rank inverse update method', Magnetic Resonance in Medicine, vol. 83, nr. 5, blz. 1796-1809. https://doi.org/10.1002/mrm.28023

Accelerating implant RF safety assessment using a low-rank inverse update method. / Stijnman, Peter R.S. (Corresponding author); Tokaya, Janot P.; van Gemert, Jeroen; Luijten, Peter R.; Pluim, Josien P.W.; Brink, Wyger M.; Remis, Rob F.; van den Berg, Cornelis A.T.; Raaijmakers, Alexander J.E.

In: Magnetic Resonance in Medicine, Vol. 83, Nr. 5, 01.05.2020, blz. 1796-1809.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

TY - JOUR

T1 - Accelerating implant RF safety assessment using a low-rank inverse update method

AU - Stijnman, Peter R.S.

AU - Tokaya, Janot P.

AU - van Gemert, Jeroen

AU - Luijten, Peter R.

AU - Pluim, Josien P.W.

AU - Brink, Wyger M.

AU - Remis, Rob F.

AU - van den Berg, Cornelis A.T.

AU - Raaijmakers, Alexander J.E.

PY - 2020/5/1

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N2 - 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.

AB - 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.

KW - FDTD

KW - implant safety

KW - minimization problems

KW - RF Safety

KW - simulations

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