MR compatibility of EEG scalp electrodes at 4 Tesla

被引:15
作者
Stevens, Todd K.
Ives, John R.
Klassen, L. Martyn
Bartha, Robert
机构
[1] John P Robarts Res Inst, Imaging Res Labs, Ctr Funct & Metab Mapping, London, ON N6A 5K8, Canada
[2] Univ Western Ontario, Dept Med Biophys, London, ON, Canada
[3] Univ Western Ontario, Dept Clin Neurol Sci, London, ON, Canada
[4] Univ Western Ontario, Dept Diagnost Radiol & Nucl Med, London, ON, Canada
关键词
EEG electrodes; MRI; B-0 field mapping; B-1; shielding; heating; safety;
D O I
10.1002/jmri.20872
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
Purpose: To design and apply a method to quantitatively evaluate the MR compatibility of electroencephalographic (EEG) scalp electrodes based on pulse sequence-independent metrics. Materials and Methods: Three types of electrodes (constructed primarily of brass, silver, and conductive plastic, respectively) were tested. B-0 field distortions, B-1 shielding, and heat induction was measured in adjacent agarose and oil phantoms at 4 T. B-0 field maps were corrected for distortions caused by the measurement apparatus and passive shim heating, and projections perpendicular to the surfaces of the electrodes were fit, generating cubic coefficients representing the electrode distortion severity. Signal loss in T-2-weighted images was used to determine B-1 shielding by the electrodes. Temperature measurements were recorded during the application of a high-power pulse sequence. Results: Significantly different B-0 distortions were observed in the three types of electrodes. The B-1 shielding detected in all three electrodes is minimal for most human MRI, and no significant heating was detected in the electrodes or adjacent phantom. Conclusion: The three types of electrodes were successfully differentiated in terms of MR compatibility based on pulse sequence-independent B-0 field distortions.
引用
收藏
页码:872 / 877
页数:6
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