A comparative study of RF heating of deep brain stimulation devices in vertical vs. horizontal MRI systems
The majority of studies that assess magnetic resonance imaging (MRI) induced radiofrequency (RF) heating of the tissue when active electronic implants are present have been performed in horizontal, closed-bore MRI systems. Vertical, open-bore MRI systems have a 90° rotated magnet and a fundamentally...
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| creator | Vu, Jasmine Bhusal, Bhumi Nguyen, Bach T Sanpitak, Pia Nowac, Elizabeth Pilitsis, Julie Rosenow, Joshua Golestanirad, Laleh |
| description | The majority of studies that assess magnetic resonance imaging (MRI) induced radiofrequency (RF) heating of the tissue when active electronic implants are present have been performed in horizontal, closed-bore MRI systems. Vertical, open-bore MRI systems have a 90° rotated magnet and a fundamentally different RF coil geometry, thus generating a substantially different RF field distribution inside the body. Little is known about the RF heating of elongated implants such as deep brain stimulation (DBS) devices in this class of scanners. Here, we conducted the first large-scale experimental study investigating whether RF heating was significantly different in a 1.2 T vertical field MRI scanner (Oasis, Fujifilm Healthcare) compared to a 1.5 T horizontal field MRI scanner (Aera, Siemens Healthineers). A commercial DBS device mimicking 30 realistic patient-derived lead trajectories extracted from postoperative computed tomography images of patients who underwent DBS surgery at our institution was implanted in a multi-material, anthropomorphic phantom. RF heating around the DBS lead was measured during four minutes of high-SAR RF exposure. Additionally, we performed electromagnetic simulations with leads of various internal structures to examine this effect on RF heating. When controlling for RMS B1+, the temperature increase around the DBS lead-tip was significantly lower in the vertical scanner compared to the horizontal scanner (0.33 ± 0.24°C vs. 4.19 ± 2.29°C). Electromagnetic simulations demonstrated up to a 17-fold reduction in the maximum of 0.1g-averaged SAR in the tissue surrounding the lead-tip in the vertical scanner compared to the horizontal scanner. Results were consistent across leads with straight and helical internal wires. Radiofrequency heating and power deposition around the DBS lead-tip were substantially lower in the 1.2 T vertical scanner compared to the 1.5 T horizontal scanner. Simulations with different lead structures suggest that the results may extend to leads from other manufacturers. |
| doi_str_mv | 10.1371/journal.pone.0278187 |
| format | Article |
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Vertical, open-bore MRI systems have a 90° rotated magnet and a fundamentally different RF coil geometry, thus generating a substantially different RF field distribution inside the body. Little is known about the RF heating of elongated implants such as deep brain stimulation (DBS) devices in this class of scanners. Here, we conducted the first large-scale experimental study investigating whether RF heating was significantly different in a 1.2 T vertical field MRI scanner (Oasis, Fujifilm Healthcare) compared to a 1.5 T horizontal field MRI scanner (Aera, Siemens Healthineers). A commercial DBS device mimicking 30 realistic patient-derived lead trajectories extracted from postoperative computed tomography images of patients who underwent DBS surgery at our institution was implanted in a multi-material, anthropomorphic phantom. RF heating around the DBS lead was measured during four minutes of high-SAR RF exposure. Additionally, we performed electromagnetic simulations with leads of various internal structures to examine this effect on RF heating. When controlling for RMS B1+, the temperature increase around the DBS lead-tip was significantly lower in the vertical scanner compared to the horizontal scanner (0.33 ± 0.24°C vs. 4.19 ± 2.29°C). Electromagnetic simulations demonstrated up to a 17-fold reduction in the maximum of 0.1g-averaged SAR in the tissue surrounding the lead-tip in the vertical scanner compared to the horizontal scanner. Results were consistent across leads with straight and helical internal wires. Radiofrequency heating and power deposition around the DBS lead-tip were substantially lower in the 1.2 T vertical scanner compared to the 1.5 T horizontal scanner. Simulations with different lead structures suggest that the results may extend to leads from other manufacturers.</description><identifier>ISSN: 1932-6203</identifier><identifier>EISSN: 1932-6203</identifier><identifier>DOI: 10.1371/journal.pone.0278187</identifier><identifier>PMID: 36490249</identifier><language>eng</language><publisher>United States: Public Library of Science</publisher><subject>Anthropomorphism ; Biology and Life Sciences ; Brain ; Brain stimulation ; Comparative analysis ; Comparative studies ; Computed tomography ; Deep brain stimulation ; Deep Brain Stimulation - methods ; Electric fields ; Electronic implants ; Engineering and Technology ; Evaluation ; Experiments ; Geometry ; Heating ; Hot Temperature ; Human body ; Humans ; Magnetic resonance ; Magnetic resonance imaging ; Magnetic Resonance Imaging - methods ; Manufacturers ; Medical equipment ; Medicine and Health Sciences ; Neuroimaging ; Patients ; Phantoms, Imaging ; Physical Sciences ; Radio frequency heating ; Radio Waves ; Research and Analysis Methods ; Scanners ; Simulation ; Stimulation ; Temperature rise ; Tomography ; Transplants & implants ; Wire</subject><ispartof>PloS one, 2022-12, Vol.17 (12), p.e0278187-e0278187</ispartof><rights>Copyright: © 2022 Vu et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.</rights><rights>COPYRIGHT 2022 Public Library of Science</rights><rights>2022 Vu et al. This is an open access article distributed under the terms of the Creative Commons Attribution License: http://creativecommons.org/licenses/by/4.0/ (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. 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Additionally, we performed electromagnetic simulations with leads of various internal structures to examine this effect on RF heating. When controlling for RMS B1+, the temperature increase around the DBS lead-tip was significantly lower in the vertical scanner compared to the horizontal scanner (0.33 ± 0.24°C vs. 4.19 ± 2.29°C). Electromagnetic simulations demonstrated up to a 17-fold reduction in the maximum of 0.1g-averaged SAR in the tissue surrounding the lead-tip in the vertical scanner compared to the horizontal scanner. Results were consistent across leads with straight and helical internal wires. Radiofrequency heating and power deposition around the DBS lead-tip were substantially lower in the 1.2 T vertical scanner compared to the 1.5 T horizontal scanner. Simulations with different lead structures suggest that the results may extend to leads from other manufacturers.</description><subject>Anthropomorphism</subject><subject>Biology and Life Sciences</subject><subject>Brain</subject><subject>Brain stimulation</subject><subject>Comparative analysis</subject><subject>Comparative studies</subject><subject>Computed tomography</subject><subject>Deep brain stimulation</subject><subject>Deep Brain Stimulation - methods</subject><subject>Electric fields</subject><subject>Electronic implants</subject><subject>Engineering and Technology</subject><subject>Evaluation</subject><subject>Experiments</subject><subject>Geometry</subject><subject>Heating</subject><subject>Hot Temperature</subject><subject>Human body</subject><subject>Humans</subject><subject>Magnetic resonance</subject><subject>Magnetic resonance imaging</subject><subject>Magnetic Resonance Imaging - methods</subject><subject>Manufacturers</subject><subject>Medical 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horizontal, closed-bore MRI systems. Vertical, open-bore MRI systems have a 90° rotated magnet and a fundamentally different RF coil geometry, thus generating a substantially different RF field distribution inside the body. Little is known about the RF heating of elongated implants such as deep brain stimulation (DBS) devices in this class of scanners. Here, we conducted the first large-scale experimental study investigating whether RF heating was significantly different in a 1.2 T vertical field MRI scanner (Oasis, Fujifilm Healthcare) compared to a 1.5 T horizontal field MRI scanner (Aera, Siemens Healthineers). A commercial DBS device mimicking 30 realistic patient-derived lead trajectories extracted from postoperative computed tomography images of patients who underwent DBS surgery at our institution was implanted in a multi-material, anthropomorphic phantom. RF heating around the DBS lead was measured during four minutes of high-SAR RF exposure. Additionally, we performed electromagnetic simulations with leads of various internal structures to examine this effect on RF heating. When controlling for RMS B1+, the temperature increase around the DBS lead-tip was significantly lower in the vertical scanner compared to the horizontal scanner (0.33 ± 0.24°C vs. 4.19 ± 2.29°C). Electromagnetic simulations demonstrated up to a 17-fold reduction in the maximum of 0.1g-averaged SAR in the tissue surrounding the lead-tip in the vertical scanner compared to the horizontal scanner. Results were consistent across leads with straight and helical internal wires. Radiofrequency heating and power deposition around the DBS lead-tip were substantially lower in the 1.2 T vertical scanner compared to the 1.5 T horizontal scanner. Simulations with different lead structures suggest that the results may extend to leads from other manufacturers.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>36490249</pmid><doi>10.1371/journal.pone.0278187</doi><tpages>e0278187</tpages><orcidid>https://orcid.org/0000-0001-7726-2496</orcidid><orcidid>https://orcid.org/0000-0003-3869-6114</orcidid><oa>free_for_read</oa></addata></record> |
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| source | Public Library of Science (PLoS) Journals Open Access; MEDLINE; DOAJ Directory of Open Access Journals; EZB-FREE-00999 freely available EZB journals; PubMed Central; Free Full-Text Journals in Chemistry |
| subjects | Anthropomorphism Biology and Life Sciences Brain Brain stimulation Comparative analysis Comparative studies Computed tomography Deep brain stimulation Deep Brain Stimulation - methods Electric fields Electronic implants Engineering and Technology Evaluation Experiments Geometry Heating Hot Temperature Human body Humans Magnetic resonance Magnetic resonance imaging Magnetic Resonance Imaging - methods Manufacturers Medical equipment Medicine and Health Sciences Neuroimaging Patients Phantoms, Imaging Physical Sciences Radio frequency heating Radio Waves Research and Analysis Methods Scanners Simulation Stimulation Temperature rise Tomography Transplants & implants Wire |
| title | A comparative study of RF heating of deep brain stimulation devices in vertical vs. horizontal MRI systems |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-02-08T01%3A08%3A38IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-gale_plos_&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=A%20comparative%20study%20of%20RF%20heating%20of%20deep%20brain%20stimulation%20devices%20in%20vertical%20vs.%20horizontal%20MRI%20systems&rft.jtitle=PloS%20one&rft.au=Vu,%20Jasmine&rft.date=2022-12-09&rft.volume=17&rft.issue=12&rft.spage=e0278187&rft.epage=e0278187&rft.pages=e0278187-e0278187&rft.issn=1932-6203&rft.eissn=1932-6203&rft_id=info:doi/10.1371/journal.pone.0278187&rft_dat=%3Cgale_plos_%3EA729468612%3C/gale_plos_%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=2748823381&rft_id=info:pmid/36490249&rft_galeid=A729468612&rft_doaj_id=oai_doaj_org_article_5f0d3d2a312e4d159dda9ba9199e5181&rfr_iscdi=true |