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在0.55T时标记MRI的可行性

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

|September 2, 2025

概括

标记MRI是可行的0.55T的心脏和语音成像. 使用REALTAG的先进技术,如螺旋平衡稳定状态自由前行 (bSSFP),为肌肉运动分析提供足够的信号噪声比 (SNR) 和标记持久性.

科学领域:

磁共振成像 (MRI)
生物医学工程

背景情况:

由于T1时间短,低场MRI (0.55T) 对标记MRI具有挑战性.
需要先进的技术来最大限度地提高功能成像的标签对比度和信号噪声比率 (SNR).

研究的目的:

评估标记MRI在0.55T的可行性.
在这种场强度下评估心脏和语音生成应用的标记持久性.

主要方法:

使用阶段敏感标记 (REALTAG) 与基于二维网格的准备和螺旋平衡稳定状态自由前行 (bSSFP) 成像.
在0.55T系统的健康志愿者中获取心脏和语音数据.
对标记持久性和对比度与噪声比率进行螺旋bSSFP与常规梯度回忆回声 (GRE) 的比较.

主要成果:

REALTAG 准备和相位敏感重建使得标语线在 0. 55 T 处快速恢复.
与GRE相比,螺旋式bSSFP的SNR提高了1. 35倍,标记持久性提高了1. 6倍.
用螺旋式bSSFP达到大约851毫秒,而用GRE达到506毫秒,对比度为6的值.

结论:

标记MRI可在0.55T下进行功能肌肉运动分析,包括心脏和语音应用.
与REALTAG制剂结合的螺旋bSSFP提供了足够的SNR和对比度,可视化心脏机制和舌头运动.

关键词:

0.55 T 其他房地产公司在SPAMM 真实时间MRI 螺旋式 bSSFP 标记成像

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