用AI预测颅骨对超声波的干扰,实现精准脑部无创治疗。
A Skull-Adaptive Framework for AI-Based 3D Transcranial Focused Ultrasound Simulation
- 基于3D颅骨CT和超声位置,用深度学习直接预测超声波场分布。
- 模型在真实颅骨上实现毫米级精度,速度比传统仿真快上千倍。
- 适合医学影像、神经调控与深度学习交叉研究者使用。
经颅聚焦超声(tFUS)是一种新兴的非侵入性脑刺激与治疗技术,可实现毫米级空间精度并靶向深部脑区。然而,人类颅骨的异质性和各向异性会导致超声波前传播严重畸变,需依赖数值求解器进行耗时的个性化规划与校正。为此,我们构建了TFUScapes——首个大规模、高分辨率的tFUS仿真数据集,基于真实人体颅骨的T1加权MRI图像生成。采用k-Wave伪谱求解器构建可扩展的仿真流水线,每个仿真输出由放置于真实头皮位置的聚焦超声换能器产生的稳态压力场。同时提出DeepTFUS模型,通过输入3D CT体积与换能器位置,直接估计归一化压力场。该模型在U-Net基础上引入换能器感知条件,结合傅里叶编码的位置嵌入与MLP层生成全局换能器嵌入,并通过特征调制、动态卷积与交叉注意力机制融合到编码器特征中。训练采用空间加权与梯度敏感损失函数,实现高保真波场逼近。TFUScapes数据集已公开发布,以推动计算声学、神经技术与深度学习交叉领域研究。项目主页:https://github.com/CAMMA-public/TFUScapes。
原文摘要 · Abstract (English)
Transcranial focused ultrasound (tFUS) is an emerging modality for non-invasive brain stimulation and therapeutic intervention, offering millimeter-scale spatial precision and the ability to target deep brain structures. However, the heterogeneous and anisotropic nature of the human skull introduces significant distortions to the propagating ultrasound wavefront, which require time-consuming patient-specific planning and corrections using numerical solvers for accurate targeting. To enable data-driven approaches in this domain, we introduce TFUScapes, the first large-scale, high-resolution dataset of tFUS simulations through anatomically realistic human skulls derived from T1-weighted MRI images. We have developed a scalable simulation engine pipeline using the k-Wave pseudo-spectral solver, where each simulation returns a steady-state pressure field generated by a focused ultrasound transducer placed at realistic scalp locations. In addition to the dataset, we present DeepTFUS, a deep learning model that estimates normalized pressure fields directly from input 3D CT volumes and transducer position. The model extends a U-Net backbone with transducer-aware conditioning, incorporating Fourier-encoded position embeddings and MLP layers to create global transducer embeddings. These embeddings are fused with U-Net encoder features via feature-wise modulation, dynamic convolutions, and cross-attention mechanisms. The model is trained using a combination of spatially weighted and gradient-sensitive loss functions, enabling it to approximate high-fidelity wavefields. The TFUScapes dataset is publicly released to accelerate research at the intersection of computational acoustics, neurotechnology, and deep learning. The project page is available at https://github.com/CAMMA-public/TFUScapes.
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