ISMRM25 - MRI Safety

ISMRM & ISMRT Annual Meeting & Exhibition • 10-15 May 2025 • Honolulu, Hawai'i

MRI Safety

Power Pitch

Physics & Engineering

Thursday, 15 May 2025

Power Pitch Theatre 2

13:15 - 15:15

Moderators: Kyoko Fujimoto & S Senthil Kumaran

Session Number: PP-21

No CME/CE Credit

13:15		Screen Number: 26 1308. On the measurement errors in SAR supervision introduced by directional couplers View Presentation Video S. Orzada, T. Fiedler, J. Kesting, M. Hubmann, M. Ladd German Cancer Research Center (DKFZ), Heidelberg, Germany Impact: This work provides a framework for calculating the measurement error in SAR calculations introduced by the directivity of the directional couplers used to measure the forward power in parallel transmit systems.
13:17		Screen Number: 27 1309. Initial validation of a 16-Channel Double-Row Transmit/Receive Coil Array for Safe Imaging with Deep Brain Electrodes at 3T View Presentation Video N. Karadeniz, S. McElroy, J. V. Hajnal, Ö. Ipek King's College London, London, United Kingdom Impact: This study provides the first experimental evidence that a double-row pTx coil can defeat RF currents on DBS electrodes while maintaining homogeneous B₁⁺ at 3T. This technology could enable safer and more effective MRI for this patient group.
13:19		Screen Number: 28 1310. Assessment of RF induced tissue heating at 3T through MR Thermometry with comparison to subject-specific simulations View Presentation Video M. Kikken, K. Custers, E. Meliadò, C. van den Berg, A. Raaijmakers University Medical Center Utrecht, Utrecht, Netherlands Impact: Within RF safety SAR guidelines, MRT measurements of RF induced heating for 3T MRI are feasible around the knees and show temperature increases of almost 2 °C. Among others, the presented methodology provides promise for potential validation of thermal simulations.
13:21		Screen Number: 29 1311. Feasibility of a universal parallel transmission RF shim concept for safer imaging of deep brain stimulation patients at 3T View Presentation Video B. Yang, S. Graham Sunnybrook Research Institute, Toronto, Canada Impact: A universal parallel transmission concept to safer MRI of DBS patients was studied. The initial results suggest patient-based safe modes may remain effective for a broader DBS patient cohort, supporting further study toward clinical application.
13:23		Screen Number: 30 1312. Impact of Implant Manufacturing Variability & Number of Measurements on Assessing RF-Induced Lead Heating & Injection Voltage View Presentation Video C. Kwok, N. Chamok, A. Dabir, A. Avakians, K. Bond, L. Al-Dayeh Boston Scientific, Valencia, United States Impact: Optimization of the needed number of in-vitro radiated measurements and active implantable medical device (AIMD) lead samples for ISO/TS 10974:2018 Tier 3 based Clause 8 (RF-induced lead heating) and Clause 15 (RF-induced injection voltage) MR Conditional safety assessments.
13:25		Screen Number: 31 1313. Additive RF and Gradient-induced Heating of Passive and Active Implants Under Clinically Relevant Exposures during MRI View Presentation Video U. Zanovello, C. Fuss, T. Goren, A. Arduino, L. Zilberti, O. Bottauscio INRIM, Torino, Italy Impact: Bulky nonmagnetic metallic implants are demonstrated to experience up to 15 % increase in maximum local temperature rise due to additive RF and gradient-induced heating under clinically relevant MRI exposure conditions.
13:27		Screen Number: 32 1314. Evaluating the RF Heating of Titanium Craniofacial Mesh Implants at 7T View Presentation Video M. Mustafa, N. I. H. Zulkarnain-Lemke, A. Sadeghi-Tarakameh, A. Grant, C. Ozutemiz, D. Darrow, Y. Eryaman University of Minnesota, Minneapolis, United States Impact: Imaging titanium mesh head implants for skull reconstruction procedures may be safe for MR scan at 7T following the IEC guidelines.
13:29		Screen Number: 33 1315. An Experimental Comparison for RF Heating of DBS Electrodes at 3T and 7T View Presentation Video N. I. H. Zulkarnain-Lemke, A. Sadeghi-Tarakameh, J. Thotland, N. Harel, Y. Eryaman University of Minnesota, Minneapolis, United States Impact: Comparing 1 g-averaged SAR (normalized to B1⁺_RMS²) around DBS electrodes at 3T and 7T suggested that 7T MRI may pose less heating risk and provided a compelling case to expand the potential of imaging DBS patients at higher-field MRI.
13:31		Screen Number: 34 1316. An open-source implementation of the IEC/IEEE 62704-1 spatial-average SAR algorithm View Presentation Video U. Zanovello, N. De Zanche University of Alberta, Edmonton, Canada Impact: The spatial-average SAR implementation enables average SAR computation compliant with IEC/IEEE 62704-1 without using commercial software. Typical applications include post-processing using circuit co-simulation, or to add this capability to EM solvers that lack this feature.
13:33		Screen Number: 35 1317. Optimization and application of MP2RAGE sequence for T1-based thermometry in the fat layer of the human calve View Presentation Video K. Custers, M. Kikken, E. Meliadò, C. van den Berg, J. Pluim, A. Raaijmakers Eindhoven University of Technology, Eindhoven, Netherlands Impact: We present a highly sensitive T1-based thermometry method applicable in fatty tissues for RF safety research. MRT in fat will be valuable to improve verification by fiber-optic probes on the skin and -using intrinsic reference- assessment of fat susceptibility change.
13:35		Screen Number: 36 1318. MR Safety Priorities and Practices: Results from an ISMRM Study Group Survey View Presentation Video J. Martinez, L. Zilberti, L. Kranold, K. Fujimoto, J. Jahn, J. Rispoli, T. Owman, L. Winter National Institute of Standards and Technology (NIST), Boulder, United States Impact: This survey reveals the MR Safety Study Group's needs while emphasizing the importance of bridging research and clinical practice. Understanding community priorities across diverse backgrounds will guide future initiatives addressing evolving safety challenges.
13:37		Screen Number: 37 1319. Safe Imaging at 3 Tesla for Children with Deep Brain Electrodes: A simulation Study of a Double-Row Parallel Transmit Coil Array View Presentation Video N. Karadeniz, D. Lumsden, J. Hajnal, Ö. Ipek King's College London, London, United Kingdom Impact: The double-row pTx coil enhances MRI safety for paediatric DBS patients by balancing B1+ homogeneity and reducing SAR, minimizing tissue heating risks and enabling safer, more reliable imaging protocols with consistent performance across models, potentially improving clinical outcomes.
13:39		Screen Number: 38 1320. Safety Evaluation of a 16-element 9.4T Human Head Transmit Array with B0 Field Probes Inserted View Presentation Video E. Berezko, G. Solomakha, N. Avdievich, F. Glang, D. Bosch, J. Bause, T. Lindig, K. Scheffler Max Planck Institute for Biological Cybernetics, Tuebingen, Germany Impact: We showed that insertion of B₀ field-probes does not substantially change the peak SAR and the RF magnetic field distribution of the 16Tx array at 9.4T. Predicted SAR changes facilitate safe use of the field-probes for in-vivo studies.
13:41		Screen Number: 39 1321. A closer look into the Partial Body SAR definition in IEC 60601-2-33 View Presentation Video X. Chen, F. Munoz, Y. Hamamura Canon Medical Research USA Inc., Mayfield Village, United States Impact: The lack of specifications in IEC 60601-2-33 regarding RF transmit coil's effective volume can cause uncertainties in SAR exposure limit assessment. We propose the standard adding more specifications on this subject.
13:43		Screen Number: 40 1322. Evaluating Rigid Motion-Affected, U-NET-Estimated Q-Matrices with Parallel RF Transmission View Presentation Video K. Blanter, A. Plumley, A. Gungor, S. Malik, E. Kopanoglu Cardiff University , Cardiff, United Kingdom Impact: The proposed approach needs a smaller corrective safety factor, which may enable higher-performance scanning without compromising safety, when using ultrahigh-field MRI for subjects who may not remain still.
13:45		Screen Number: 41 1323. Effects of increasing RF transmit frequency on SAR and SAR efficiency in MRI up to 14 Tesla View Presentation Video R. Daschner, M. Ladd, T. Fiedler German Cancer Research Center (DKFZ), Heidelberg, Germany Impact: This study investigates the effects of increasing RF frequencies on SAR and SAR efficiency, enhancing the understanding of the underlying causalities. Findings indicate the feasibility of safely operating MRI systems up to 14T, supporting ongoing advancements in UHF MRI technology.
13:47		Screen Number: 42 1324. Impact of Lateral Movement of Patients on the RF-Induced Heating of Active Implantable Medical Devices at 3T MRI View Presentation Video M. K. Akter, A. Shen, M. Z. Islam, J. Zheng, M. Steckner, J. Chen University of Houston, Houston, United States Impact: This research demonstrates that patients with AIMDs, positioned with lateral offsets, may have additional heating hazards relative to patients centered in wide bore MRI coils.
13:49		Screen Number: 43 1325. Experimental Assessment of Skin-Bore Contact Heating during Magnetic Resonance Imaging View Presentation Video D. Spenkelink, W. Brink University of Twente, Enschede, Netherlands Impact: Although the observed levels did not exceed regulatory limits on extremity SAR, increased local SAR levels were observed at longitudinal locations along the bore wall that correspond to the high levels of conservative electric field around the bircage endrings.
13:51		Screen Number: 44 1326. Optimization of Oscillating Diffusion Encoding Gradient Reduces Mechanical Vibration on Ultra-high Gradient System View Presentation Video X. Chen, H. Li, Z. Shuai, J. Zhu, J. Yuan, Z. Lin, D. Wu Zhejiang University, HangZhou, China Impact: OG caused mechanical vibration poses significant challenge to MRI hardware, especially in high-performance gradient system. Our vibration optimized OG waveforms can improve subject’s comfort and have potential to enable more precise parameter fitting, enhancing the accuracy of microstructural imaging.
13:53		Screen Number: 45 1327. Feasibility Study of Subject-Specific Brain SAR Maps Retrieved from MRI Data View Presentation Video J. Martinez, U. Zanovello, A. Arduino, H. H. Hu, K. Moulin, S. Ogier, O. Bottauscio, L. Zilberti, K. Keenan National Institute of Standards and Technology (NIST), Boulder, United States Impact: A method for image-based patient-specific SAR mapping retrieved from acquired MRI data in the brain is demonstrated. The resulting maps aligned with electromagnetic simulation-based SAR maps, representing a step toward practical SAR monitoring during clinical examinations.
13:55		Screen Number: 46 1328. E-field Simulation in Human Body Models for High Performance Non-Whole-Body Gradient Coil IEC Cardiac Stimulation Compliance View Presentation Video Y. Hua, S-K Lee, S. Gokyar, T. Foo, D. Yeo GE HealthCare Technology & Innovation Center, Niskayuna, United States Impact: CS compliance for a NWB GC has not been widely discussed even though it is a key safety criterion. This work shows the feasibility of simulation-based CS risk assessment in a high-performance head GC.
13:57		Screen Number: 47 1329. Keeping a Low (Temperature) Profile: An Analysis of In Vivo RF Heating of Vagus Nerve Stimulation Devices in Low (0.55 T) vs. High-Field (1.5 T) MRI View Presentation Video P. Sanpitak, B. Bhusal, J. Pilitsis, N. Seiberlich, F. Jiang, T. Zaidi, L. Golestanirad Northwestern University, Evanston, United States Impact: This study challenges the common belief that low-field MRI is inherently safer for patients with implants, demonstrating that RF heating at 0.55 T can be similar to or exceed that at 1.5 T, underscoring the need for careful patient assessment.
13:59		Screen Number: 48 1330. From Benchtop to In Silico: Factors Influencing Radiofrequency-Induced Heating of Bone View Presentation Video S. Moshage, C. Petersen, A. Dillon, E. Brightbill, P. Delgorio, W. Torres, D. Holyoak, R. Siskey Exponent, Inc., Philadelphia, United States Impact: This study enhances MR safety assessments, showing that high-fidelity computational models can accurately predict RF-induced heating surrounding implants in bone while underscoring the dependence of temperature rise on the geometry and material properties of the media adjacent to the devices.
14:01		Screen Number: 49 1331. Influence of Deactivated 8Tx/16Rx Transceiver Coil Elements on 3D SAR Distribution at 7T MRI of the Body Trunk View Presentation Video F. Jabbarigargari, M. Terekhov, L. Schreiber Comprehensive Heart Failure Center, University Hospital Wuerzburg, Wuerzburg, Germany Impact: This study highlights the significant impact of coil element deactivation on SAR, requiring a safety factor in clinical routines to protect patients if coil elements become deactivated.
14:03		Screen Number: 50 1332. MR safety in research practice at 7T: an update of our experience in evaluating passive implants for non-clinical scans View Presentation Video O. Kraff, A. Verheyen, H. Quick University Duisburg-Essen, Essen, Germany Impact: This retrospective study shares an extensive experience in imaging subjects with small implants within the RF coil. For larger implants outside a minimum distance to the RF coil a history of safe use of the GUFI recommendations is also reported.

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