MRI monitoring of focused ultrasound sonications near metallic hardware

Weber, Hans; Ghanouni, Pejman; Pascal-Tenorio, Aurea; Pauly, Kim Butts; Hargreaves, Brian A.

doi:10.1002/mrm.27034

Cited by 3 publications

(1 citation statement)

References 16 publications

(19 reference statements)

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“…The signals in the vicinity to IMDs are generally corrupted by artifacts mainly due to the susceptibility differences between IMDs and surrounding tissues [15][16][17] . To reduce the effect of susceptibility artifacts, thermometry based on the T1 relaxation time has been explored [18][19][20][21] , which is less sensitive to susceptibility differences. Nevertheless, these methods have relatively lower measurement sensitivity and temporal resolution, and could be compromised by RF interactions-induced artifacts when applied to elongate conductors.…”

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confidence: 99%

In-Human Assessment of Radio Frequency Induced Heating for Implants during MRI

Jiang,

Zhang,

et al. 2024

Preprint

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Radio frequency induced heating of medical implants during magnetic resonance imaging (MRI) poses a serious threat to patient safety, and in vivo assessment of heating permits individualized on-site safety assessment. Based on the proton resonance frequency (PRF) thermometry, we developed a method for the in vivo evaluation of implant heating. It combined PRF signals around the implants with bioheat transfer law to reduce the interference of metal artifacts and to estimate the RF heating at implant surface. To apply this idea, we proposed a PRF-based test module consisting of processes of thermometry-heating-thermometry and verified its feasibility in phantom. Then, we validated this module for electrodes in the pig brain and investigated the effect of its parameters, as a result, the heating assessment could be achieved in approximately 2 min with a mean difference to probe measurement of 0.6 °C. Finally, we demonstrated the clinical translation in a patient with a conventional deep brain stimulation device and derived the individualized safe RF condition under 3.0T MRI. This study presents a practical solution for the in-human safety assessment of implants during MRI, which can be beneficial for both clinical and research purposes.

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confidence: 99%

In-Human Assessment of Radio Frequency Induced Heating for Implants during MRI

Jiang,

Zhang,

et al. 2024

Preprint

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Investigation of Artifacts and Optimization in Proton Resonance Frequency Thermometry Towards Heating Risk Monitoring of Implantable Medical Devices in Magnetic Resonance Imaging

Zhang

Jiang

et al. 2021

IEEE Trans. Biomed. Eng.

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New Insights into MR Safety for Implantable Medical Devices

Kuroda

Yatsushiro

2022

MRMS

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Over the last two decades, the status of MR safety has dramatically changed. In particular, ever since the MR-conditional cardiac device was approved by the Food and Drug Administration (FDA) in 2008 and by the Pharmaceuticals and Medical Devices Agency (PMDA) in 2012, the safety of patients with an implantable medical device (IMD) has been one of the most important issues in terms of MR use. In conjunction with the regulatory approvals for various IMDs, standards, technical specifications, and guidelines have also been rapidly created and developed. Many invaluable papers investigating and reviewing the history and status of MR use in the presence of IMDs already exist. As such, this review paper seeks to bridge the gap between clinical practice and the information that is obtained by standard-based tests and provided by an IMD’s package insert or instructions for use. Interpretation of the gradient of the magnetic flux density intensity of the static magnetic field with respect to the magnetic displacement force is discussed, along with the physical background of RF field. The relationship between specific absorption rate (SAR) and B 1+RMS , and their effects on image quality are described. In addition, insofar as providing new directions for future research and practice, the feasibility of safety test methods for RF-induced heating of IMDs using MR thermometry, evaluation of tissue heat damage, and challenges in cardiac IMDs will be discussed.

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MRI monitoring of focused ultrasound sonications near metallic hardware

Abstract: The proposed 2DMSI thermometry has the potential to allow MR-guided FUS treatments of patients with metallic hardware and therefore expand its reach to a larger patient population. Magn Reson Med 80:259-271, 2018. © 2017 International Society for Magnetic Resonance in Medicine.

Cited by 3 publications

References 16 publications

In-Human Assessment of Radio Frequency Induced Heating for Implants during MRI

In-Human Assessment of Radio Frequency Induced Heating for Implants during MRI

Investigation of Artifacts and Optimization in Proton Resonance Frequency Thermometry Towards Heating Risk Monitoring of Implantable Medical Devices in Magnetic Resonance Imaging

New Insights into MR Safety for Implantable Medical Devices

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