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Abstract #4192

Varying Echo Spacing for Acoustic Noise Optimization in Single-Shot Echo-Planar Imaging

Zhenliang Lin1, Qikang Li1, Huanhuan Liu2, Ming Liu2, Qiufeng Yin2, Rui Wang3, Guobin Li3, Dengbin Wang2, and Jie Luo1
1Shanghai Jiao Tong University, Shanghai, China, 2Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China, 3Shanghai United Imaging Healthcare Co., Ltd, Shanghai, China

Single-shot echoplanar imaging (EPI) sequence is a commonly used readout scheme for functional and diffusion magnetic resonance imaging (fMRI and dMRI). It features fast alternating gradient that generate loud acoustic noise, often causing discomfort for patients and even pose risk for sensitive populations. In this study, we used genetic algorithm to optimize both sound pressure level and spectral entropy for single-shot EPI sequence by varying the duration of each readout unit with a sinusoidal waveform, changing the timbre significantly with increased entropy and reduced loudness. The sequence was implemented on a 3.0T pediatric uMR Alpha system.

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