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Abstract #1473

An easily controllable spread spectrum using chirp radio frequency pulse and its application in compressed sensing MRI

Xiaobo Qu 1 , Ying Chen 1 , Xiaoxing Zhuang 1 , Zhiyu Yan 1 , Di Guo 2 , and Zhong Chen 1

1 Department of Electronic Science, Xiamen University, Xiamen, Fujian, China, 2 School of Computer and Information Engineering, Xiamen University of Technology, Xiamen, Fujian, China

To accelerate imaging, compressed sensing MRI (CS-MRI) suggests performing randomly undersampling to reduce the coherence between the encoding matrix and the sparsity bases. Spread spectrum (SS) is recently introduced to improves the reconstruction by reducing this coherence. But SS is achieved via a second order shim coil which limits modulation intensity and is not convenient to be operated. In this work, we propose a chirp radio frequency (RF) pulses to easily control the spread intensity by choosing a proper bandwidth and apply in CS. Simulation on the sampled data implies that the reconstruction error reduces if a proper bandwidth is provided.

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