Abstract
A micro-scale 3dB high power RF (Radio Frequency) balance 4 Ports Bridge of MRI (Magnet Resonator Imaging) is realized with 3D PCB manufacturing and integrated capacity and theoretical calculation in this paper . At first a analysis method is proposed based on transmission line theory of the 1/4-wavelength and the lump and transmission parameters, and the transmisson line length and lump components of capacitors value are gotted for this micro-scale bridge. Then this Micro-Balance Bridge (MBB) manufacturing with FR4 and overall size is 100mm 60 mm 1 mm, and it size reduce 1/3 compared with plane bridge. MBB could be achieved 2 ways amplitude balance is about 0.1dB, phase balance is 1 , insert loss is about 0.3dB, flatness is not more than 0.01dB on the operate frequency of 64MHZ 5MHZ. This bridge could be supported input pulse power more than 1000 W by temperature experiment result. Use MBB integrate into the MRI systems and make imaging experiment and could reduce 20% imaging time from 1.2 ms to 900us, and it has good efficiency and homogeneity.
Highlights
The magnetic resonance RF power bridge is splitted one way high power signal to two ways balance signals to polarize the body coil with its phase’s difference of 90 degrees
This paper proposes a microwave hybrid bridge, which firstly optimizes the design from theoretical analysis and simulation
The Micro-bridge w be integrated into the Xingaoyi 1.5T MRI system and scan with SE(SPIN Echo) pulse sequence, and get the high performance like as SNR, polarization effective, isolation and hot effective compared with XGYBB product, and has very small size
Summary
The magnetic resonance RF power bridge is splitted one way high power signal to two ways balance signals to polarize the body coil with its phase’s difference of 90 degrees. In order to improve the polarization efficiency of the coil, it is necessary to realize the phase difference of the two ways signal to be accurate to 90 degrees, and the two signals amplitudes are balanced. Compared with the domestic and international magnetic resonance system transmitting power bridge, the balance bridge has better isolation and balancer. It could be easy integrated with the RF transmitting coil to achieve the entire miniaturized magnetic resonance RF front-end system if further studied. At last,this BB are taken he imaging experiment in MRI system and the image uniformity and polarity are improved compared with the international products of the same type
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