0 <em>μ</em> Magnetic Polarizer for 1.5-T MRI

Hassan Ali; Erik Forsberg; Hu Jun

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0 μ Magnetic Polarizer for 1.5-T MRI

机译：0 μ磁偏振器，用于1.5-T MRI

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Study of human pathologies and acquisition of anatomical images without any surgical intervention inside human body is possible because of magnetic resonance imaging (MRI). This work exploits the notable properties of zero permeability (0 μ) split ring resonators (SRR) metamaterial (MM) magnetic polarizer which could distort, control and reject uniform RF (radio frequency) magnetic field for 1.5-T MRI systems. Unique polarizer was proposed to etch on PCB (printed circuit board) slabs for compact thickness of 5 mm only. In addition, polarizer was loaded with novel combination of parametric elements (capacitors, inductors) which could made the structure tunable to achieve resonance at different working frequencies. We achieved the value of relative permeability, μr=0.02+j0.1 for 1.5-T MRI systems at 63.85 MHz. Furthermore polarizer, when used with MRI scanner at optimized position, uniformly redistributed and enhanced the magnetic field while lowered specific absorption ratio (SAR), induced electric field, power dissipation, and locally improved SNR (signal to noise ratio) at the scanned region of phantom {real case was human body}. The polarizer minimized the damaging effects of RF energy absorption in human tissue and prevented them from heating. 展开▼

机译：由于磁共振成像（MRI），在人体内部无需任何外科干预的情况下，就可以进行人体病理学研究和获取解剖图像。这项工作利用了零磁导率（0μ）裂环谐振器（SRR）超材料（MM）磁偏振器的显着特性，它可以扭曲，控制和拒绝1.5-T MRI系统的均匀RF（射频）磁场。提出了一种独特的偏光片，用于在PCB（印刷电路板）板上蚀刻，厚度仅为5 mm。此外，偏振器装有参数元件（电容器，电感器）的新颖组合，可以使结构可调以在不同的工作频率下实现共振。对于63.85 MHz处的1.5-T MRI系统，我们获得了相对磁导率的值μr= 0.02 + j0.1。此外，当偏振片与MRI扫描器一起使用时处于最佳位置时，可以均匀地重新分布并增强磁场，同时降低比吸收比（SAR），感应电场，功率耗散，并在扫描后的区域局部改善SNR（信噪比）。幻影{实际情况是人体}。偏振器可最大程度地减少人体组织中射频能量吸收的破坏作用，并防止它们发热。展开▼

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《Journal of Electrical & Electronic Systems》 |2017年第4期|共8页

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Hassan Ali; Erik Forsberg; Hu Jun;
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中图分类无线电电子学、电信技术;

关键词
MRIZero permeabilitySRRSAR;

机译：MRI零渗透率;

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机译：非对比度3-Tesla磁共振成像（3-T MRI）对股骨 - 髋臼冲击中的1.5-Tesla磁共振射率（1.5-T MRA）的诊断性能

2. Is Dedicated Extremity 1.5-T MRI Equivalent to Standard Large-Bore 1.5-T MRI for Foot and Knee Examinations? [J] . Sutter Reto, Tresch Florian, Buck Florian M., AJR: American Journal of Roentgenology : Including Diagnostic Radiology, Radiation Oncology, Nuclear Medicine, Ultrasonography and Related Basic Sciences . 2014,第6期

机译：足部和膝盖检查专用的末端1.5-T MRI等效于标准的大口径1.5-T MRI吗？

3. In vivo cellular imaging of magnetically labeled hybridomas in the spleen with a 1.5-T clinical MRI system. [J] . Smirnov P, Gazeau F, Lewin M, Magnetic resonance in medicine: official journal of the Society of Magnetic Resonance in Medicine . 2004,第1期

机译：用1.5-T临床MRI系统对脾脏中磁性标记杂交瘤进行体内细胞成像。

4. Sensitivity of a 1.5-T MRI system for electromagnetic fields [C] . Harberts Dick W., van Helvoort Mark International Symposium on Electromagnetic Compatibility . 2014

机译：1.5 T MRI系统对电磁场的灵敏度

5. Pre-polarized MRI in a zero readout magnetic field and radiofrequency selective excitation in zero-field NMR. [D] . Agrawal, Aarati. 2004

机译：零读出磁场中的预极化MRI和零场NMR中的射频选择性激发。

6. Utility of manual fractional anisotropy measurements in the management of patients with Parkinson disease: a feasibility study with a 1.5-T magnetic resonance imaging system [O] . Romulo V de Oliveira, João S Pereira 2021

机译：手动分数各向异性测量在帕金森病患者管理中的效用：具有1.5-T磁共振成像系统的可行性研究

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机译：用于检测患者的生理状况的生理状态检测装置，并且在用于磁共振成像的磁共振成像系统，MRI系统的扫描期间最小化所产生的干扰量。 MRI系统的操作方法和压力检测装置，用于检测压力信号并最小化磁共振成像扫描过程中产生的干扰量。带孔的磁共振系统。

4. The system of magnetic resonance imaging (MRI) for the maintenance of the geometric alignment scans of diagnosis during the examination of a patient, the method of magnetic resonance imaging (MRI) for the maintenance of the geometric alignment scans of diagnosis during the examination of a patient.And the system of magnetic resonance imaging (MRI) for the maintenance of the geometric alignment scans to diagnose a patient [P] . 外国专利： BR112014032716A2 . 2017-06-27

机译：用于在患者检查期间维持诊断的几何对准扫描的磁共振成像（MRI）系统，用于在患者检查期间维持诊断的几何对准扫描的磁共振成像（MRI）方法病人以及用于维持几何对准扫描以诊断病人的磁共振成像（MRI）系统

5. Field frequency barrier system for use in MRI-system comprises magnets, polarized magnetic field, gradient spool unit and micro spool [P] . 外国专利： DE10041808A1 . 2001-03-29

机译：用于MRI系统的场频屏障系统包括磁体，极化磁场，梯度阀芯单元和微型阀芯

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0 μ Magnetic Polarizer for 1.5-T MRI

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