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Abstract #3282

Eddy current measuring device for gradient correction with shieldedcoaxialcable coils

Qingyun Liu1, Xueyan Song2, Kecheng Yuan1, Chuangjia Liu3, Yunyu Gao3, Lin Chen2, and Bensheng Qiu1
1Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei, Anhui, China, 2Institute of Advanced Technology, University of Science and Technology of China, Hefei, Anhui, China, 3Anhui Fuqing Medical Equipment Company, Hefei, Anhui, China

Synopsis

Keywords: Gradients, Non-Array RF Coils, Antennas & Waveguides, eddy current; shielded‐coaxial‐cable coils; gradient correction; MRI

Motivation: Rapid changes in gradient magnetic fields induce eddy currents, posing a considerable challenge to the accuracy and stability of MRI systems.

Goal(s): Accurate measurement of eddy currents is crucial for the rapid and efficient design of eddy current compensation parameters.

Approach: The gradient eddy current measuring device utilizes coaxial cables to construct coil units and compares the channels crosstalk with traditional copper coils.

Results: The device leverages the shielding effect of coaxial cables to reduce mutual interference between coils. With a a power crosstalk ratio above 30dB between any two units, the channel isolation is higher than that of traditional copper coils.

Impact: By precisely quantifying the magnitude and distribution of eddy currents, MRI system engineers and researchers can develop effective correction algorithms that mitigate their impact on image quality. A dedicated eddy current measurement device necessitates a high-isolation to acquire MR signals.

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