Low eddy current RF shielding enclosure designs for 3T MR applications.
Low eddy current RF shielding enclosure designs for 3T MR applications.
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DOI：
10.1002/mrm.26766
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发表时间：
2018-03
影响因子：
3.3
通讯作者：
Levin CS
中科院分区：
文献类型：
--
作者：
Lee BJ;Watkins RD;Chang CM;Levin CS
核磁共振兼容的医疗设备在核磁共振环境下操作，同时受益于核磁共振的优越解剖信息。避免这些仪器和MR系统之间的电磁干扰是至关重要的。本文研究和分析了正电子发射断层扫描（PET）探测器的不同屏蔽结构对射频屏蔽效果和梯度感应涡流性能的影响。然而，这项工作的结果适用于任何核磁共振兼容设备的屏蔽考虑。设计了六种不同厚度、图案和材料的屏蔽外壳结构：固体和分段铜、磷青铜网（PBM）和碳纤维复合材料（CFC）。进行了一系列射频屏蔽效能和梯度感应涡流测试。在屏蔽效果方面，与CFC和分段结构相比，不同厚度和PBM结构的固体铜的屏蔽效果明显更好（>15 dB）。对于梯度感应涡流性能，不同厚度的固体铜屏蔽结构与分段铜、PBM和CFC屏蔽结构相比，其效果显著差达3.89 dB。我们已经评估了几种屏蔽设计的射频屏蔽效果和梯度感应涡流伪像，只有PBM在这两个方面都显示出积极的结果。
MR-compatible medical devices operate within the MR environment while benefitting from the superior anatomic information of MRI. Avoiding electromagnetic interference between such instrumentation and the MR system is crucial. In this work, various shielding configurations for positron emission tomography (PET) detectors were studied and analyzed regarding RF shielding effectiveness and gradient-induced eddy current performances. However, the results of this work apply to shielding considerations for any MR-compatible devices. Six shielding enclosure configurations with various thicknesses, patterns and materials were designed: solid and segmented copper, phosphor bronze mesh (PBM), and carbon fiber composite (CFC). A series of tests were performed on RF shielding effectiveness and the gradient-induced eddy current. For the shielding effectiveness, the solid copper with various thickness and PBM configurations yield significantly better shielding effectiveness (>15 dB) compared to CFC and segmented configurations. For the gradient-induced eddy current performance, the solid copper shielding configurations with different thicknesses showed significantly worse results, up to a factor of 3.89 dB, compared to the segmented copper, PBM and the CFC configurations. We have evaluated the RF shielding effectiveness and the gradient-induced eddy current artifacts of several shielding designs and only the PBM showed positive outcomes for both aspects.
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影响因子：
3.8
作者：
Grant AM;Lee BJ;Chang CM;Levin CS
通讯作者：
Levin CS
影响因子：
3.3
作者：
AHN, CB;CHO, ZH
通讯作者：
CHO, ZH
DOI：
10.1186/1532-429x-15-18
发表时间：
2013-02-15
期刊：
Journal of cardiovascular magnetic resonance : official journal of the Society for Cardiovascular Magnetic Resonance
影响因子：
--
作者：
Bhandiwad AR;Cummings KW;Crowley M;Woodard PK
通讯作者：
Woodard PK
影响因子：
1.5
作者：
Histed SN;Lindenberg ML;Mena E;Turkbey B;Choyke PL;Kurdziel KA
通讯作者：
Kurdziel KA
DOI：
10.3390/s110302525
发表时间：
2011
期刊：
Sensors (Basel, Switzerland)
影响因子：
--
作者：
García-Martín J;Gómez-Gil J;Vázquez-Sánchez E
通讯作者：
Vázquez-Sánchez E