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Abstract #0954

High Resolution DTI using Dual-density Spiral for Efficient Sampling and Reduced Off-resonance Artifacts

Xiaodong Ma 1 , Zhe Zhang 1 , Hui Zhang 1 , Bida Zhang 2 , Sheng Fang 3 , and Hua Guo 1

1 Center for Biomedical Imaging Research, Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, China, 2 Healthcare Department, Philips Research China, Shanghai, China, 3 Institute of nuclear and new energy technology, Tsinghua University, Beijing, China

While variable density spiral (VDS) has been used to generate high resolution diffusion tensor imaging, it has low sampling efficiency and severe off-resonance artifacts caused by prolonged readout duration. To solve this, a more efficient trajectory, dual-density spiral (DDS), was proposed to replace VDS in DTI. In vivo results show that DDS can improve the sampling efficiency and reduce off-resonance blurring compared to VDS. Besides, it can correct the motion-induced phase errors more effectively since a larger full-sampling region and thus higher resolution navigator can be provided.

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