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Reconfigurable MRI technology for low-SAR imaging of deep brain stimulation at 3T: Application in bilateral leads, fully-implanted systems, and surgically modified lead trajectories

Ehsan Kazemivalipour, Boris Keil, Alireza Vali, Sunder Rajan, Behzad Elahi, Ergin Atalar, Lawrence L. Wald, Joshua Rosenow, Julie Pilitsis, Laleh Golestanirad
2019 NeuroImage  
Recently we introduced a patient-adjustable reconfigurable coil technology that substantially reduced local SAR at tips of single isolated DBS leads during MRI at 1.5 T in 9 realistic patient models.  ...  A simple surgical modification in trajectory of implanted leads was demonstrated to increase the SAR reduction efficiency of the rotating coil to >90% in a patient with a fully implanted bilateral DBS  ...  concentric loops in the trajectory of DBS leads to reduce RF heating during MRI at 1.5 T and 3T.  ... 
doi:10.1016/j.neuroimage.2019.05.015 pmid:31096058 pmcid:PMC7266624 fatcat:ouk7ln3q7bdxjp3ii7wjqfbtpe

Safety and image quality at 7T MRI for deep brain stimulation systems: Ex vivo study with lead-only and full-systems

Bhumi Bhusal, Jason Stockmann, Bastien Guerin, Azma Mareyam, John Kirsch, Lawrence L. Wald, Mark J. Nolt, Joshua Rosenow, Roberto Lopez-Rosado, Behzad Elahi, Laleh Golestanirad, Haydar Celik
2021 PLoS ONE  
Our work provides the safety assessment of ultra-high field MRI at 7 T in patients with DBS implants.  ...  We performed experiments with both lead-only and complete DBS systems implanted in anthropomorphic phantoms. RF heating was measured for 43 unique patient-derived device configurations.  ...  RF-induced heating in tissue near bilateral DBS implants during MRI at 1.5 T and 3T: The role of surgical lead management.  ... 
doi:10.1371/journal.pone.0257077 pmid:34492090 pmcid:PMC8423254 fatcat:yjxz7mrhoncwfnuqfye5p6ccl4

Safety of Simultaneous Scalp or Intracranial EEG during MRI: A Review

Hassan B. Hawsawi, David W. Carmichael, Louis Lemieux
2017 Frontiers in Physics  
We provide a theoretical overview of the mechanisms at play specifically associated with the presence of EEG equipment connected to the subject in the MR environment, and of the resulting health hazards  ...  The purpose of this review is to explore the magnetic resonance imaging safety aspects specifically associated with the use of scalp EEG and other brain-implanted electrodes such as intracranial EEG electrodes  ...  ACKNOWLEDGMENTS The authors acknowledge the excellent suggestions from the reviewers. The authors also would like to thank Dr. Robert Stoermer for the valuable contribution to this review.  ... 
doi:10.3389/fphy.2017.00042 fatcat:mibceoktn5cslmigk2odsmkejq

Reconfigurable MRI coil technology can substantially reduce RF heating of deep brain stimulation implants: First in-vitro study of RF heating reduction in bilateral DBS leads at 1.5 T

Laleh Golestanirad, Ehsan Kazemivalipour, Boris Keil, Sean Downs, John Kirsch, Behzad Elahi, Julie Pilitsis, Lawrence L. Wald, Xi Chen
2019 PLoS ONE  
to RF heating of the leads.  ...  In all patients, we were able to find an optimum coil rotation angle and reduced the heating of both left and right leads to a level below the heating produced by the body coil.  ...  Acknowledgments This work was supported by the NIH grants R03EB024705 and R00EB021320. Author Contributions  ... 
doi:10.1371/journal.pone.0220043 pmid:31390346 pmcid:PMC6685612 fatcat:fjce7dptvreu5krkncpmsihfyy

Reconfigurable MRI coil technology can substantially reduce RF heating at the tips of bilateral deep brain stimulation implants [article]

Laleh Golestanirad, Boris Keil, Sean Downs, John Kirsch, Behzad Elahi, Julie Pilitsis, Lawrence L Wald
2018 bioRxiv   pre-print
concerns due to RF heating of the leads.  ...  Recently we introduced a patient-adjustable reconfigurable MRI coil system to reduce the SAR at the tip of deep brain stimulation implants during MRI at 1.5T.  ...  In this work we report, for the first time, measurement results of temperature rise at the tips bilateral DBS lead implants with realistic trajectories during MRI at 1.5 T using the rotating coil system  ... 
doi:10.1101/474015 fatcat:6bzszcr6qba63h7477bevzrdwq

3T contrast-enhanced whole heart coronary MRA using 32-channel cardiac coils for the detection of coronary artery disease

Qi Yang, Kuncheng Li, Xiaoming Bi, Jing An, Renate Jerecic, Debiao Li
2009 Journal of Cardiovascular Magnetic Resonance  
Prior to implantation (36 ± 78 days) patients were investigated on a 1.5 T clinical scanner (Siemens Avanto © , Germany) to assess left ventricular function (LVEF), LV end-diastolic volume (LVEDV) and  ...  The use of ICDs in this large patient population is still limited by high costs and possible adverse events including inappropriate discharges and progression of heart failure.  ...  Acknowledgements his work was supported in part by grants from the national institute of heart, lung and blood R01HL072704 and R01HL61912, and Donald W. Reynolds Foundation grant.  ... 
doi:10.1186/1532-429x-11-s1-o5 fatcat:gl7skspj3fccnbpjakn3dvwbn4

Stereotactic implantation of deep brain stimulation electrodes: a review of technical systems, methods and emerging tools

Simone Hemm, Karin Wårdell
2010 Medical and Biological Engineering and Computing  
As DBS implantations, and any other stereotactic and functional surgical procedure, require accurate, precise and safe targeting of the brain structure, the technical aids for preoperative planning, intervention  ...  As DBS surgery already today is an information technology intensive domain an "intuitive visualization" interface for improving management of these data in relation to surgery is suggested.  ...  to be done as one incision procedure; material and leads that make MR-imaging safer and reduces the risk of RF-induced heating; and field steering [20] .  ... 
doi:10.1007/s11517-010-0633-y pmid:20517711 fatcat:xv5bokfc5jcqnarca3qlwsxsse


2019 Stereotactic and Functional Neurosurgery  
Objectives: Ischemic stroke is a leading cause of long-term disability in the industrialized world.  ...  For this study, patients enter the study at the beginning of their planned adjuvant TMZ chemotherapy phase following their planned surgical resection of their GBM, and their planned standard cares that  ...  Methods: For image-guided asleep DBS, preoperative 3-T MRI were merged with post-frame 1.5-T stereotactic MRI.  ... 
doi:10.1159/000501568 fatcat:pv2k5hzuindpdmffhvqlkl25ji

2006 Biennial Meeting of the American Society for Stereotactic and Functional Neurosurgery. Boston, Mass., June 1–4, 2006

2006 Stereotactic and Functional Neurosurgery  
Methods: The VNS Therapy System (pulse generator, Model 102; leads Models 300 and 302; Cyberonics, Houston, TX) underwent an in vitro assessment of MRI-related heating at 1.5-and 3-T using different positioning  ...  Therefore, the purpose of this in vitro investigation was to evaluate MRI safety for the VNS Therapy System at 1.5-and 3-T using various RF coil configurations and anatomic regions for MRI examinations  ...  Results: Our method for the implantation of the deep brain stimulation electrode offers the possibility to: (1) rid the patient and surgeon of arch or emiarch during surgical procedures without compromising  ... 
doi:10.1159/000097756 fatcat:g4hd2dulcbf5pgylow74icmsxy

XXIst Congress of the European Society for Stereotactic and Functional Neurosurgery. Implementing Research in Clinical Applications. Maastricht, The Netherlands, September 17-20, 2014: Abstracts

2014 Stereotactic and Functional Neurosurgery  
There are few reports about similar cases in the literature.  ...  Conclusion: We hope to finish the analysis of samples of 10 PD vs. 10 control cases by the beginning of next year.  ...  Statistical analysis (Student T test) was performed to analyze surgical time-length of traditional bilateral sequential DBS and bilateral simultaneous DBS procedure in our department with the same surgical  ... 
doi:10.1159/000367644 pmid:25247733 fatcat:i6v7nsnacvfv3mjvpvrxmtlkxu

MRI with ultrahigh field strength and high-performance gradients: challenges and opportunities for clinical neuroimaging at 7 T and beyond

Behroze Vachha, Susie Y Huang
2021 European Radiology Experimental  
Emerging clinical applications of 7-T MRI and state-of-the-art gradient systems equipped with up to 300 mT/m gradient strength are reviewed, and the impact and benefits of such advances to anatomical,  ...  structural and functional MRI are discussed in a variety of neurological conditions.  ...  Augusto Lio Goncalves Filho for sharing the images used in Fig. 7 .  ... 
doi:10.1186/s41747-021-00216-2 pmid:34435246 pmcid:PMC8387544 fatcat:75bnubdt2rhhzg3tng5syb26oa

Advanced Imaging and Direct Targeting of the Motor Thalamus and Dentato-Rubro-Thalamic Tract for Tremor: A Systematic Review

Nicholas Gravbrot, Manojkumar Saranathan, Nader Pouratian, Willard S. Kasoff
2020 Stereotactic and Functional Neurosurgery  
specific, in vivo identification of the ventral intermediate nucleus and the dentato-rubro-thalamic tract.  ...  Direct targeting methods for stereotactic neurosurgery in the treatment of essential tremor have been the subject of active research over the past decade but have not yet been systematically reviewed.  ...  Disclosure Statement The authors have no conflicts of interest to declare. Funding Sources No funding sources outside of our institution were utilized.  ... 
doi:10.1159/000507030 pmid:32403112 fatcat:qhqldkcnlfek3kpgf6sanohdou

SANP - Supplementum 1

2010 Swiss Archives of Neurology and Psychiatry  
We compared nocturnal bilateral cerebral hemodynamic changes induced by SDB in acute stroke patients, using near infra-red spectroscopy (NIRS).  ...  Surgical planning tools enable the simulation of tissue removal to define a surgical corridor.  ...  standardized BOLD-fMRI (executed tongue and finger movements, imagined foot movements) at 1.5 T or 3.0 T to study M1-somatotopy.  ... 
doi:10.4414/sanp.2010.02212 fatcat:2ashaeol5zfyvicqlmvzpyuq74

International Society for Therapeutic Ultrasound Conference 2016

Brian Fowlkes, Pejman Ghanouni, Narendra Sanghvi, Constantin Coussios, Paul C. Lyon, Michael Gray, Christophoros Mannaris, Marie de Saint Victor, Eleanor Stride, Robin Cleveland, Robert Carlisle, Feng Wu (+723 others)
2017 Journal of Therapeutic Ultrasound  
O21 Tests of thermal ablation with a 230 kHz transcranial MRI-guided focused ultrasound system in a large animal model Nathan McDannold 1 , Jonathan Sutton 1 , Natalia Vykhodtseva 1 , Margaret Livingstone  ...  However, the HU-Temperature relation is nonlinear and its characteristics are different for different tissue types.  ...  The presence of such shocks leads to increased tissue heating and initiation of boiling in milliseconds.  ... 
doi:10.1186/s40349-016-0079-2 fatcat:wjrvxyhd5bappjipymenn5swwq

49th Annual Congress of the Canadian Neurological Sciences Federation

2014 Canadian Journal of Neurological Sciences  
Elucidating the role of thrombophilia in perinatal stroke informs pathogenesis and clinical management.  ...  The patient had a history of right pontine stroke approximately 2 years ago. On admission, CT head and CT angiogram were normal. 1.5 T MRI brain did not show diffusion restriction.  ...  HIv infection induced pro-IL-1β in human microglia at 4 hr post-infection, which was prevented by the caspase inhibitor, YvAD-fmk. Exposure of microglia to HIv gp120 caused IL-1β production.  ... 
doi:10.1017/s0317167100018709 fatcat:465gqktgybball5hywzsmeenqu
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