Feasibility of Using Toroidal Transceivers for Acquiring Intraoperative MR Images Around Deep Brain Stimulation Electrodes.

IF 4.7 2区 医学 Q1 NEUROIMAGING NeuroImage Pub Date : 2024-10-30 DOI:10.1016/j.neuroimage.2024.120912
Nur Izzati Huda Zulkarnain, Alireza Sadeghi-Tarakameh, Russell L Lagore, Dee M Koski, Gregory J Metzger, Zuzan Cayci, Noam Harel, Yigitcan Eryaman
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Abstract

Introduction: Magnetic resonance imaging (MRI) provides excellent soft tissue contrast for visualizing of deep brain stimulation (DBS) targets, allowing validation of the electrode placement, and assessing complications such as microhemorrhage and edema. However, the presence of the electrodes can introduce challenges such as radiofrequency (RF) induced current artifacts and excessive heating of the electrode contacts. Additionally, extended procedure times are also considered a disadvantage when using MRI as an intraoperative imaging modality following DBS electrode placement.

Method: We propose a novel approach of using toroidal resonators to inductively couple the shaft of the electrode to the scanner's transmit-receive chain thereby utilizing it as a localized imaging antenna. The small extent of the field generated by the electrode antenna allows fast imaging with smaller field-of-views (FOVs) spanning only a few centimeters. Furthermore, we present a fast and accurate safety monitoring strategy that can be used to predict the temperature increase at the electrical contacts of the electrode.

Results and discussion: Imaging with the toroidal transceiver yields a higher signal-to-noise ratio (SNR) efficiency in proximity to the electrodes. This approach reduced the RF induced current artifacts around the electrode which enhanced the visibility of the shaft and improved electrode localization. Moreover, the limited sensitivity around the electrode can be exploited to perform fast scans with small FOVs. The predicted heating around DBS contacts was in quantitative agreement with the experimental heating in swine studies with a normalized root-mean-square error (NRMSE) ≤ 0.09.

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使用环形收发器获取围绕脑深部刺激电极的术中磁共振图像的可行性。
简介磁共振成像(MRI)为脑深部刺激(DBS)靶点的可视化提供了极佳的软组织对比度,可以验证电极的放置位置,并评估微出血和水肿等并发症。然而,电极的存在会带来一些挑战,如射频(RF)引起的电流伪影和电极触点的过度加热。此外,在使用磁共振成像作为 DBS 电极置入术中成像方式时,手术时间延长也被认为是一个不利因素:我们提出了一种新方法,即使用环形谐振器将电极轴与扫描仪的发射接收链感应耦合,从而将其用作局部成像天线。电极天线产生的磁场范围较小,可在仅几厘米的较小视场(FOV)内快速成像。此外,我们还提出了一种快速准确的安全监控策略,可用于预测电极电触点的温度升高:使用环形收发器成像可在靠近电极的地方获得更高的信噪比(SNR)效率。这种方法减少了电极周围的射频感应电流伪影,从而提高了轴的可见度,改善了电极定位。此外,还可以利用电极周围有限的灵敏度,以较小的视野进行快速扫描。在猪的研究中,DBS 触点周围的预测加热与实验加热在数量上是一致的,归一化均方根误差 (NRMSE) ≤ 0.09。
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来源期刊
NeuroImage
NeuroImage 医学-核医学
CiteScore
11.30
自引率
10.50%
发文量
809
审稿时长
63 days
期刊介绍: NeuroImage, a Journal of Brain Function provides a vehicle for communicating important advances in acquiring, analyzing, and modelling neuroimaging data and in applying these techniques to the study of structure-function and brain-behavior relationships. Though the emphasis is on the macroscopic level of human brain organization, meso-and microscopic neuroimaging across all species will be considered if informative for understanding the aforementioned relationships.
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