用空间与解剖信息融合提升脑白质纤维追踪精度,减少假阳性连接。
Deep Learning-Based Diffusion MRI Tractography: Integrating Spatial and Anatomical Information
- 结合卷积层空间特征与Transformer解剖结构建模,优化长程纤维预测。
- 在仿真数据上实现66.2%有效纤维率、63.8%白质覆盖,重建24/25束。
- 适用于多中心采集方案,优于传统RNN方法,尤其减少过延伸现象。
扩散MRI纤维追踪技术可无创可视化大脑白质通路,在神经科学与临床中对脑连接及神经疾病研究至关重要。然而,重建轨迹的准确性长期受限。近年深度学习虽提升了白质覆盖,却常导致大量假阳性连接,主因是依赖局部信息预测长程轨迹。为此,本文提出新框架,融合图像域空间信息(通过卷积层提取)与沿轨迹的解剖信息(由Transformer解码器建模),并采用加权损失函数缓解训练中的纤维类别不平衡问题。在模拟的ISMRM 2015追踪挑战数据集上,该方法实现66.2%的有效纤维率、63.8%白质覆盖,并成功重建24/25条纤维束。在多中心Tractoinferno数据集上,该方法可适应不同扩散MRI采集方案,相较基于RNN的方法,白质覆盖提升5.7%,过延伸降低4.1%。
原文摘要 · Abstract (English)
Diffusion MRI tractography technique enables non-invasive visualization of the white matter pathways in the brain. It plays a crucial role in neuroscience and clinical fields by facilitating the study of brain connectivity and neurological disorders. However, the accuracy of reconstructed tractograms has been a longstanding challenge. Recently, deep learning methods have been applied to improve tractograms for better white matter coverage, but often comes at the expense of generating excessive false-positive connections. This is largely due to their reliance on local information to predict long range streamlines. To improve the accuracy of streamline propagation predictions, we introduce a novel deep learning framework that integrates image-domain spatial information and anatomical information along tracts, with the former extracted through convolutional layers and the later modeled via a Transformer-decoder. Additionally, we employ a weighted loss function to address fiber class imbalance encountered during training. We evaluate the proposed method on the simulated ISMRM 2015 Tractography Challenge dataset, achieving a valid streamline rate of 66.2%, white matter coverage of 63.8%, and successfully reconstructing 24 out of 25 bundles. Furthermore, on the multi-site Tractoinferno dataset, the proposed method demonstrates its ability to handle various diffusion MRI acquisition schemes, achieving a 5.7% increase in white matter coverage and a 4.1% decrease in overreach compared to RNN-based methods.
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