数据驱动的电导率脑成像使用3T核磁共振
Kyu-Jin Jung1, Stefano Mandija2,3, Chuanjiang Cui1
1Department of Electrical and Electronic Engineering, Yonsei University, Seoul, Republic of Korea.
Human brain mapping
|July 19, 2023
概括
人工神经网络 (ANN) 通过使用模拟数据进行更准确的脑电导图来改善磁共振电特性断层扫描 (MR-EPT) 导电性成像. 这种方法对临床应用和疾病检测有前途.
科学领域:
- 生物医学工程 生物医学工程
- 医疗成像医学成像
- 计算电磁学 计算机电磁学
背景情况:
- 磁共振电特性断层扫描 (MR-EPT) 非侵入性地测量组织电特性 (EPs),如导电性.
- 组织导电性在临床研究中显示出作为生物标记物的潜力.
- 传统的MR-EPT导电性重建由于数值假设而面临不准确性.
研究的目的:
- 开发基于人工神经网络 (ANN) 的非线性导电性估计器,以改善大脑成像.
- 克服传统基于模型的MR-EPT导电性重建的局限性.
- 通过模拟,in-silico和in-vivo数据验证ANN方法.
主要方法:
- 从有限差异时间域 (FDTD) 电磁模拟中对201个合成的T2加权自旋回声 (SE) 数据集进行了ANN训练.
- 培训数据集包括T2-w SE大小和转接阶段信息.
- 使用in-silico,志愿者和患者数据对ANN进行了评估,并与传统的基于阶段的EPT方法 (例如S-G Kernel,cr-EPT,Poly-Fit,基于Integral) 相比.
主要成果:
- 与体实验中的传统方法相比,ANN方法产生了更准确的导电性图,结构保存更好.
- 基于ANN的重建显示在体内数据 (包括病理) 上的质量,概括性和稳定性得到改善.
- 该方法在各种信号噪声比 (SNR) 级别和可重复性条件下显示出可靠的性能.
结论:
- 拟议的基于ANN的MR-EPT导电性估计器显著提高了脑导电性成像的准确性和质量.
- 该网络从模拟到体外数据 (包括病理) 的概括能力突显了其临床潜力.
- 这种方法为医疗应用中的定量导电性映射提供了更强大,更准确的替代方案.
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