Quadrature transceive wireless coil: Design concept and application for bilateral breast MRI at 1.5 T

电磁线圈 成像体模 射频线圈 扫描仪 声学 物理 正交(天文学) 核磁共振 谐振器 光学 材料科学 量子力学
作者
Viktor Puchnin,Aigerim Jandaliyeva,Anna Hurshkainen,Georgiy Solomakha,Anton Nikulin,Polina Petrova,Anna Lavrenteva,Anna Andreychenko,Alena V. Shchelokova
出处
期刊:Magnetic Resonance in Medicine [Wiley]
标识
DOI:10.1002/mrm.29507
摘要

Purpose Development of a novel quadrature inductively driven transceive wireless coil for breast MRI at 1.5 T. Methods A quadrature wireless coil (HHMM-coil) design has been developed as a combination of two linearly polarized coils: a pair of ‘metasolenoid’ coils (MM-coil) and a pair of Helmholtz-type coils (HH-coil). The MM-coil consisted of an array of split-loop resonators. The HH-coil design included two electrically connected flat spirals. All the wireless coils were coupled to a whole-body birdcage coil. The HHMM-coil was studied and compared to the linear coils in terms of transmit and SAR efficiencies via numerical simulations. A prototype of HHMM-coil was built and tested on a 1.5 T scanner in a phantom and healthy volunteer. We also proposed an extended design of the HHMM-coil and compared its performance to a dedicated breast array. Results Numerical simulations of the HHMM-coil with a female voxel model have shown more than a 2.5-fold increase in transmit efficiency and a 1.7-fold enhancement of SAR efficiency compared to the linearly polarized coils. Phantom and in vivo imaging showed good agreement with the numerical simulations. Moreover, the HHMM-coil provided good image quality, visualizing all areas of interest similar to a multichannel breast array with a 32% reduction in signal-to-noise ratio. Conclusion The proposed quadrature HHMM-coil allows the B 1 + $$ {\mathrm{B}}_1^{+} $$ -field to be significantly better focused in the region-of-interest compared to the linearly polarized coils. Thus, the HHMM-coil provides high-quality breast imaging on a 1.5 T scanner using a whole-body birdcage coil for transmit and receive.
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