多尺度注意力与Transformer改进的U-Net高质量电阻抗层析成像方法
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1.天津工业大学电子与信息工程学院天津300387;2.天津市光电检测技术与系统重点实验室天津300387

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R318;TH701;TN911.7

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天津市自然科学基金重点项目(24JCZDJC00790)、国家自然科学基金(61872269)项目资助


High-quality electrical impedance tomography method based on multi-scale attention and transformer-enhanced U-Net
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1.School of Electronics & Information Engineering, Tiangong University, Tianjin 300387, China; 2.Tianjin Key Laboratory of Optoelectronic Detection Technology and System, Tianjin 300387, Chin

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    摘要:

    由于现有卷积网络固有的局部感受野造成的复杂特征表达局限性,忽略全局分布信息所造成的内含物电导率参数重建不准确和形状失真,限制了电阻抗层析成像技术在实际中的应用。提出了一种基于注意力与视觉Transformer混合的端到端深度学习方法(HiRef-EIT)。该方法以U-Net为骨干网络,采用层级特征堆叠构建多尺度空间信息表达;设计了多头空间衰减注意力(MHRA)模块作为编码器,降低计算复杂度的同时保持全局信息建模能力;引入基于通道注意力和坐标注意力并行的瓶颈连接模块,分别从通道层面和空间层面构建电导率分布和内含物形状的潜在表示,采用基于交叉注意力的解码器单元实现全局-局部信息的多尺度融合,增强模型的特征表达能力。HiRef-EIT通过大量的仿真数据训练获得最优模型参数,并在多样化复杂形状和肺部仿真模型进行了实验验证。定量评估指标表明,该方法在重建图像中的均方根误差(RMSE)结果为6.028,结构相似性指数(SSIM)结果为0.956,可视化结果表明重建结果和真实分布具有很好的一致性。实验结果表明,提出的HiRef-EIT展现出了良好的鲁棒性和泛化能力,相较于传统的卷积网络成像模型,该方法为EIT在医学诊断、工业过程监测等领域的应用提供了高质量成像解决方案。

    Abstract:

    Due to the inherent local receptive field limitations of conventional convolutional networks, the representation of complex features in electrical impedance tomography (EIT) is often restricted, leading to inaccurate reconstruction of inclusion conductivity parameters and shape distortion caused by the neglect of global distribution information. To address these challenges, this paper proposes an end-to-end deep learning framework, HiRef-EIT, which integrates attention mechanisms and vision Transformers. Built upon a U-Net backbone, the proposed method employs hierarchical feature stacking to construct a multi-scale latent space representation. A multi-head spatial reduction attention(MHRA) module is designed to reduce computational complexity while preserving global modeling capability. Additionally, a skip bottleneck module combining channel attention and coordinate attention in parallel is introduced to capture the latent representations of conductivity distribution and inclusion shape from both the channel and spatial perspectives. A decoder unit based on cross-attention is employed to achieve global-local multi-scale feature fusion, thereby enhancing the model’s representation capacity. HiRef-EIT is trained using a large volume of simulated data to obtain optimal model parameters, and is experimentally validated on diverse complex-shaped phantoms and lung simulation models. Quantitative evaluation metrics demonstrate that the proposed method achieves a root mean square error (RMSE) of 6.028 and a structural similarity index (SSIM) of 0.956, with visual results showing strong consistency with the ground truth distributions and boundaries. The experimental results reveal that HiRef-EIT exhibits excellent robustness and generalization. Compared with traditional convolutional imaging models, the proposed method offers a high-quality imaging solution for EIT, thus holding significant theoretical and practical value for applications in medical diagnostics and industrial process monitoring.

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李秀艳,吴文旭,王琦.多尺度注意力与Transformer改进的U-Net高质量电阻抗层析成像方法[J].电子测量与仪器学报,2026,40(5):179-190

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  • 在线发布日期: 2026-07-13
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