Simulations of induced MRI RF eddy current patterns in virtual human models.
Full EM simulations are applied to high-resolution anatomical models, in this case a pregnant woman.
Comparison of RF coil-induced SAR and corresponding temperature rise, considering thermoregulated and basal perfusion as well as thermal properties of tissues.
|Expertise and Infrastructure|
The radio frequency (RF) and gradient coil fields from commercial scanners present a number of potential health risks for the patients. To develop the methodology for assessing MRI risks, IT'IS initiated the EUREKA Project MRI+, and several follow-up projects, with various partners from industry and academia. IT'IS performs customized evaluations of MRI exposure scenarios for a wide range of MR transmit technologies and patient populations. Based on the results, the critical parameters can be identified to improve overall patient safety. IT'IS has cooperated with major MRI manufacturers, including GE, Siemens and Philips, and actively contributes to the IEC 60601-2-33 safety requirements for medical MRI.
The group’s Yellow Submarine Laboratory is equipped with a range of benchtop MRI testing equipment including a PiX system, a MITS 1.5 and 3T system, the latest DASY6 RX90L with DASY52NEO licenses, and a wide range of specialized probes, including hardened probes designed specifically for MRI environments. With more than 100 Sim4Life licenses, including the Virtual Population 3.x and multiple animal models, and several High Performance Computers (HPC) ranging from Graphics Processing Unit (GPU) clusters to supercomputers, our interdisciplinary research team can tackle highly specific and complex research tasks with superior innovation and efficiency – while ensuring compliance to national and international standards.
|Select Customized Research Projects of the Past Years
|Solutions Beyond State-of-the-Art|
As new MRI technologies evolve, risk assessment becomes significantly more complex. As the current methods for demonstrating MR safety are still highly empirical, it is important to continue to protect higher-risk populations, such as patients with medical implants or impaired thermoregulation, without resorting to overly conservative risk estimates which stifle innovation and technological progress. The IT'IS Foundation is committed to expanding its MR safety activities collectively with potential partners.
We look forward to discussing with you how we can best support your R&D initiatives and regulatory submissions – simply call us at +41 44 245 96 96 or send us an email at email@example.com.
|Induced radiofrequency fields in patients undergoing MR examinations: Insights for risk assessment. Physics in Medicine and Biology, 66(18), 2021, doi:10.1088/1361-6560/ac212d|
|Anatomical Model Uncertainty for RF Safety Evaluation of Metallic Implants Under MRI Exposure. Bioelectromagnetics, 40(7):458-471, 2019, doi:10.1002/bem.22206|
|Efficient and Reliable Assessment of the Maximum Local Tissue Temperature Increase at the Electrodes of Medical Implants under MRI Exposure. Bioelectromagnetics, 40(6):422-433, 2019, doi:10.1002/bem.22208|
|Data‐Driven Experimental Evaluation Method for the Safety Assessment of Implants With Respect to RF‐Induced Heating During MRI. Radio Science, 53(6):700-709, 2018, doi:10.1029/2017RS006433|
|On the estimation of the worst-case implant-induced RF-heating in multi-channel MRI. Physics in Medicine and Biology, 62(12):4711-4727, 2017|
|Virtual Population-Based Assessment of the Impact of 3 Tesla Radiofrequency Shimming and Thermoregulation on Safety and B1+ Uniformity. Magnetic Resonance in Medicine, 76(3):986-997, 2016|
|Convex Optimization of MRI Exposure for Mitigation of RF-Heating from Active Medical Implants. Physics in Medicine and Biology, 60(18):7293-7308, 2015|
|Heating and Safety Concerns of the Radio-Frequency Field in MRI. In Current Radiology ReportsCurrent Radiology Reports, 3(12), Springer, 2015, doi:10.1007/s40134-015-0128-6|
|Rapid Method for Thermal Dose-Based Safety Supervision during MR Scans. Bioelectromagnetics, 36(5):398-407, 2015|
|Thermal Tissue Damage Model Analyzed for Different Whole-Body SAR and Scan Durations for Standard MR Body Coils. Magnetic Resonance in Medicine, 71(1):421-431, 2014, doi:10.1002/mrm.24671|
|Whole Body and Local RF Absorption in Human Models as a Function of Anatomy and Position within 1.5T MR Body Coil. Magnetic Resonance in Medicine, 71(2):839-845, 2014, doi:10.1002/mrm.24690|
|CEM43 Thermal Dose Thresholds: A Potential Guide for Magnetic Resonance Radiofrequency Exposure Levels? European Radiology, 23(8):2215-2227, 2013, doi:10.1007/s00330-013-2825-y|
|Local SAR Enhancements in Anatomically Correct Children and Adult Models as a Function of Position Within 1.5 T MR Body Coil. Progress in Biophysics and Molecular Biology, 107(3):428-433, 2011, doi:10.1016/j.pbiomolbio.2011.09.017|
|Analysis of the Local Worst-Case SAR Exposure Caused by an MRI Multi-transmit Body Coil in Anatomical Models of the Human Body. Physics in Medicine and Biology, 56(15):4649-4659, 2011, doi:10.1088/0031-9155/56/15/002|
|Measurement, Simulation and Uncertainty Assessment of Implant Heating During MRI. Physics in Medicine and Biology, 54(13):4151-4169, 2009, doi:10.1088/0031-9155/54/13/012|