arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2606.09497physics.med-ph
收藏

经颅聚焦超声模拟中颅骨声学建模策略的实验验证:交叉比较研究

Experimental Validation of Skull Acoustic Modelling Strategies for Transcranial Focused Ultrasound Simulation: A Cross-Comparison Study

University of York(约克大学);University of Dundee(邓迪大学)

Han Li, Aidan J Horner, Xinyu Zhang, Zhihong Huang

AI总结:

本研究实验比较了五种k-Wave颅骨模型在220-1000 kHz频率下的性能,发现峰值压力误差20%-31%,强度误差41%-77%,焦点体积误差11%-67%,定位偏差数毫米,线性映射模型压力误差最低但无模型在所有指标上一致占优。

摘要:

颅骨的精确声学建模对于模拟引导的经颅聚焦超声(tFUS)至关重要,但常用的颅骨参数化策略在复杂性和报告准确性上存在差异。本研究实验比较了五种k-Wave颅骨模型:两种体素级线性映射模型、两种三层模型和一种单层固定参数模型。测试了来自五个历史人类颅骨和两个Thiel-防腐人类颅骨的十九个感兴趣区域,频率为220 kHz、680 kHz和1000 kHz。使用声全息重建碗状表面源场,并将模拟的颅内压力场与针式水听器测量结果进行基准比较。在不同频率下,平均峰值压力误差范围为20%至31%,而强度误差达到41%至77%。-6 dB焦点体积误差范围为11%至67%,焦点位置偏差通常为几毫米。模拟通常预测的插入损耗小于测量值,表明倾向于低估颅骨相关衰减并高估透射的颅内暴露。具有固定衰减的线性映射模型给出了最低的频率平均压力误差,但没有任何模型在所有指标上显示出一致的优势。这些结果表明,当前的颅骨模型可以再现总体颅内波束模式,同时在暴露、焦点覆盖和目标定位方面保留显著的定量不确定性。

英文摘要:

Accurate acoustic modelling of the skull is essential for simulation-guided transcranial focused ultrasound (tFUS), but commonly used skull parameterisation strategies differ in complexity and reported accuracy. This study experimentally compared five k-Wave skull models: two voxel-wise linear mapping models, two three-layer models, and one single-layer fixed-parameter model. Nineteen regions of interest from five historical and two Thiel-embalmed human skulls were tested at 220 kHz, 680 kHz, and 1000 kHz. Bowl-surface source fields were reconstructed using acoustic holography, and simulated intracranial pressure fields were benchmarked against needle-hydrophone measurements. Across frequencies, mean peak-pressure errors ranged from 20% to 31%, whereas intensity errors reached 41% to 77%. Errors in -6 dB focal volume ranged from 11% to 67%, and focal-position discrepancies were typically several millimetres. Simulations generally predicted smaller insertion losses than measured, indicating a tendency to underestimate skull-related attenuation and overestimate transmitted intracranial exposure. The linear mapping model with fixed attenuation gave the lowest frequency-averaged pressure error, but no model showed a consistent advantage across all metrics. These results show that current skull models can reproduce gross intracranial beam patterns while retaining substantial quantitative uncertainty in exposure, focal coverage, and target localisation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑