2
|
Atefi SR, Serano P, Poulsen C, Angelone LM, Bonmassar G. Numerical and Experimental Analysis of Radiofrequency-Induced Heating Versus Lead Conductivity During EEG-MRI at 3 T. IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY 2019; 61:852-859. [PMID: 31210669 PMCID: PMC6579539 DOI: 10.1109/temc.2018.2840050] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
This study investigates radiofrequency (RF)-induced heating in a head model with a 256-channel electroencephalogram (EEG) cap during magnetic resonance imaging (MRI). Nine computational models were implemented each with different EEG lead electrical conductivity, ranging from 1 to 5.8 × 107 S/m. The peak values of specific absorption rate (SAR) averaged over different volumes were calculated for each lead conductivity. Experimental measurements were also performed at 3-T MRI with a Gracilaria Lichenoides (GL) phantom with and without a low-conductive EEG lead cap ("InkNet"). The simulation results showed that SAR was a nonlinear function of the EEG lead conductivity. The experimental results were in line with the numerical simulations. Specifically, there was a ΔT of 1.7 °C in the GL phantom without leads compared to ΔT of 1.8 °C calculated with the simulations. Additionally, there was a ΔT of 1.5 °C in the GL phantom with the InkNet compared to a ΔT of 1.7 °C in the simulations with a cap of similar conductivity. The results showed that SAR is affected by specific location, number of electrodes, and the volume of tissue considered. As such, SAR averaged over the whole head, or even SAR averaged over volumes of 1 or 0.1 g, may conceal significant heating effects and local analysis of RF heating (in terms of peak SAR and temperature) is needed.
Collapse
Affiliation(s)
- Seyed Reza Atefi
- Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129 USA, and also with the University of Boras 50190, Boras Sweden
| | - Peter Serano
- Division of Biomedical Physics, Center for Devices and Radiological Health, Office of Science and Engineering Laboratories, U.S. Food and Drug Administration, Silver Spring, MD 11401 USA
| | | | - Leonardo M Angelone
- Division of Biomedical Physics, Center for Devices and Radiological Health, Office of Science and Engineering Laboratories, U.S. Food and Drug Administration, Silver Spring, MD 11401 USA
| | - Giorgio Bonmassar
- Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129 USA
| |
Collapse
|
3
|
Tian L, Zimmerman B, Akhtar A, Yu KJ, Moore M, Wu J, Larsen RJ, Lee JW, Li J, Liu Y, Metzger B, Qu S, Guo X, Mathewson KE, Fan JA, Cornman J, Fatina M, Xie Z, Ma Y, Zhang J, Zhang Y, Dolcos F, Fabiani M, Gratton G, Bretl T, Hargrove LJ, Braun PV, Huang Y, Rogers JA. Large-area MRI-compatible epidermal electronic interfaces for prosthetic control and cognitive monitoring. Nat Biomed Eng 2019; 3:194-205. [PMID: 30948811 DOI: 10.1038/s41551-019-0347-x] [Citation(s) in RCA: 143] [Impact Index Per Article: 28.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Accepted: 01/02/2019] [Indexed: 12/11/2022]
Abstract
Skin-interfaced medical devices are critically important for diagnosing disease, monitoring physiological health and establishing control interfaces with prosthetics, computer systems and wearable robotic devices. Skin-like epidermal electronic technologies can support these use cases in soft and ultrathin materials that conformally interface with the skin in a manner that is mechanically and thermally imperceptible. Nevertheless, schemes so far have limited the overall sizes of these devices to less than a few square centimetres. Here, we present materials, device structures, handling and mounting methods, and manufacturing approaches that enable epidermal electronic interfaces that are orders of magnitude larger than previously realized. As a proof-of-concept, we demonstrate devices for electrophysiological recordings that enable coverage of the full scalp and the full circumference of the forearm. Filamentary conductive architectures in open-network designs minimize radio frequency-induced eddy currents, forming the basis for structural and functional compatibility with magnetic resonance imaging. We demonstrate the use of the large-area interfaces for the multifunctional control of a transhumeral prosthesis by patients who have undergone targeted muscle-reinnervation surgery, in long-term electroencephalography, and in simultaneous electroencephalography and structural and functional magnetic resonance imaging.
Collapse
Affiliation(s)
- Limei Tian
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA.,Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Benjamin Zimmerman
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Aadeel Akhtar
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Ki Jun Yu
- School of Electrical and Electronic Engineering, Yonsei University, Seoul, Republic of Korea
| | - Matthew Moore
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Jian Wu
- Applied Mechanics Laboratory, Department of Engineering Mechanics, Center for Mechanics and Materials and Center for Flexible Electronics Technology, Tsinghua University, Beijing, China
| | - Ryan J Larsen
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Jung Woo Lee
- Department of Materials Science and Engineering, Pusan National University, Busan, Republic of Korea
| | - Jinghua Li
- Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Yuhao Liu
- Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Brian Metzger
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Subing Qu
- Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Xiaogang Guo
- Applied Mechanics Laboratory, Department of Engineering Mechanics, Center for Mechanics and Materials and Center for Flexible Electronics Technology, Tsinghua University, Beijing, China
| | - Kyle E Mathewson
- Department of Psychology, University of Alberta, Edmonton, Alberta, Canada
| | - Jonathan A Fan
- Department of Electrical Engineering, Stanford University, Stanford, CA, USA
| | - Jesse Cornman
- Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Michael Fatina
- Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Zhaoqian Xie
- Departments of Civil and Environmental Engineering, Mechanical Engineering, and Materials Science and Engineering, Northwestern University, Evanston, IL, USA
| | - Yinji Ma
- Applied Mechanics Laboratory, Department of Engineering Mechanics, Center for Mechanics and Materials and Center for Flexible Electronics Technology, Tsinghua University, Beijing, China
| | - Jue Zhang
- Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Yihui Zhang
- Applied Mechanics Laboratory, Department of Engineering Mechanics, Center for Mechanics and Materials and Center for Flexible Electronics Technology, Tsinghua University, Beijing, China
| | - Florin Dolcos
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Monica Fabiani
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Gabriele Gratton
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Timothy Bretl
- Department of Aerospace Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Levi J Hargrove
- Feinberg School of Medicine, Northwestern University, Shirley Ryan AbilityLab, Chicago, IL, USA
| | - Paul V Braun
- Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Yonggang Huang
- Departments of Civil and Environmental Engineering, Mechanical Engineering, and Materials Science and Engineering, Northwestern University, Evanston, IL, USA
| | - John A Rogers
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, USA. .,Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL, USA. .,Departments of Materials Science and Engineering, Biomedical Engineering, Neurological Surgery, Chemistry, Mechanical Engineering, Electrical Engineering and Computer Science, Simpson Querrey Institute and Feinberg Medical School Center for Bio-Integrated Electronics, Northwestern University, Evanston, IL, USA.
| |
Collapse
|
4
|
Jaime S, Cavazos JE, Yang Y, Lu H. Longitudinal observations using simultaneous fMRI, multiple channel electrophysiology recording, and chemical microiontophoresis in the rat brain. J Neurosci Methods 2018; 306:68-76. [PMID: 29778509 DOI: 10.1016/j.jneumeth.2018.05.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Revised: 05/15/2018] [Accepted: 05/15/2018] [Indexed: 02/02/2023]
Abstract
BACKGROUND fMRI blood oxygenation level-dependent (BOLD) signal has been widely used as a surrogate for neural activity. However, interpreting differences in BOLD fMRI based on underlying neuronal activity remains a challenge. Concurrent rsMRI data collection and electrophysiological recording in combination with microiontophoretically injected modulatory chemicals allows for improved understanding of the relationship between resting state BOLD and neuronal activity. NEW METHODS Simultaneous fMRI, multi-channel intracortical electrophysiology and focal pharmacological manipulation data to be acquired longitudinally in rats for up to 2 months. Our artifact replacing technique is optimized for combined LFP and rsMRI data collection. RESULTS Intracortical implantation of a multichannel microelectrode array resulted in minimal distortion and signal loss in fMRI images inside a 9.4T MRI scanner. rsMRI-induced electrophysiology artifacts were replaced using an in-house developed algorithm. Microinjection of AMPA (α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid) enhanced dopaminergic neuronal activity in the ventral tegmental area (VTA) and altered LFP signal and fMRI functional connectivity in the striatum. COMPARISONS WITH EXISTING METHOD(S) Nanomanufacturing advances permit the production of MRI-compatible microelectrode arrays (with 16 or more channels), extending research beyond conventional methods limited to fewer channels. Our method permits longitudinal data collection of LFP and rsMRI and our algorithm effectively detects and replaces fMRI-induced electrophysiological noise, permitting rsMRI data collection concomitant with LFP recordings. CONCLUSIONS Our model consists of longitudinal concurrent fMRI and multichannel intracortical electrophysiological recording during microinjection of pharmacological agents to modulate neural activity in the rat brain. We used commercial micro-electrodes and recording system and can be readily generalized to other labs.
Collapse
Affiliation(s)
- Saul Jaime
- Neuroimaging Research Branch, National Institute on Drug Abuse, National Institutes of Health, Baltimore, MD, USA; Department of Cellular and Integrative Physiology, University of Texas Health Science Center at San Antonio, San Antonio, USA
| | - Jose E Cavazos
- Department of Cellular and Integrative Physiology, University of Texas Health Science Center at San Antonio, San Antonio, USA; Department of Neurology, University of Texas Health Science Center at San Antonio, San Antonio, USA
| | - Yihong Yang
- Neuroimaging Research Branch, National Institute on Drug Abuse, National Institutes of Health, Baltimore, MD, USA
| | - Hanbing Lu
- Neuroimaging Research Branch, National Institute on Drug Abuse, National Institutes of Health, Baltimore, MD, USA.
| |
Collapse
|