语音生成实时MRI在0.55 T的时间
Yongwan Lim1, Prakash Kumar1, Krishna S Nayak1
1Ming Hsieh Department of Electrical and Computer Engineering, Viterbi School of Engineering, University of Southern California, Los Angeles, California, USA.
Magnetic resonance in medicine
|October 6, 2023
概括
高性能0.55T实时MRI (RT-MRI) 成功可视化了语音的产生. 与GRE相比,优化的螺旋平衡SSFP序列提供了优越的图像质量和信号噪声比 (SNR),性能优于更高的场强度.
科学领域:
- 医疗成像医学成像
- 生物物理学的生物物理.
- 语音科学 语言科学
背景情况:
- 实时MRI (RT-MRI) 对于理解语音表达至关重要.
- 传统的MRI场强度 (1.5T,3T) 在动态语音任务中存在速度和图像质量的限制.
- 当代较低场强度系统为提高RT-MRI性能提供了潜力.
研究的目的:
- 用0.55TMRI系统演示语音制作RT-MRI.使用0.55TMRI系统.
- 评估不同成像参数的性能权衡.
- 为了比较0.55T系统的能力与传统的更高场强度.
主要方法:
- 健康的成年志愿者在0.55T系统上接受了RT-MRI,该系统具有高性能梯度和8通道上呼吸道线圈.
- 基于螺旋的平衡SSFP (bSSFP) 和渐变回忆回声 (GRE) 脉冲序列被采用了时间有限差异受约束的重建.
- 测试了三个螺旋读数持续时间 (8.90,5.58,3.48毫秒),以评估关器对比度,模糊度和工件.
主要成果:
- 螺旋式GRE和bSSFP都捕获了快速演讲期间的舌头边界动态.
- 螺旋bSSFP具有最短的读数 (3.48ms,TR=5.30ms) 产生了最佳的图像质量,比GRE提供了1.54倍的SNR提升.
- bSSFP提供了更高的SNR,但在TR>10.9毫秒时易受带带工件的影响;较长的读数增加了SNR效率,但也导致模糊.
结论:
- 高性能0.55TMRI系统可用于语音生成RT-MRI.
- 螺旋bSSFP可以有效地用于声道成像,而无需带状文物.
- 与语音RT-MRI的1.5T或3T系统相比,0.55T系统显示出更高的SNR效率和图像质量.
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