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arXiv 2304.05074physics.med-ph
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使用多透镜衍射层提升用于3D大视场超声定位显微镜的换能器矩阵灵敏度:一项仿真研究

Boosting transducer matrix sensitivity for 3D large field ultrasound localization microscopy using a multi-lens diffracting layer: a simulation study

Hugues Favre, Mathieu Pernot, Mickael Tanter, Clément Papadacci

AI总结:

本研究通过仿真提出一种结合大多发散元件与校正延迟律波束成形及多透镜衍射层的新型3D成像方法,有效提升了经颅超声定位显微镜的灵敏度,在大型合成微血管体模中成功检测到93%的微泡,展现出实现大视场穿骨3D ULM的巨大潜力。

摘要:

绘制全脑微血流图对于脑部疾病的早期诊断至关重要。超声定位显微镜(ULM)最近被应用于以微米级尺度绘制并量化成年患者大脑中的二维微血流。由于经颅能量损失显著降低了成像灵敏度,全脑3D临床ULM仍面临挑战。具有大表面积的大孔径探头可以同时提高分辨率和灵敏度。然而,大的有效表面意味着需要数千个声学元件,临床转化受限。在本研究中,我们通过仿真研究了一种基于大发散元件并结合采用校正延迟律的适配波束成形的新型高灵敏度3D成像方法,以提高灵敏度。首先,模拟了不同尺寸和形状的单个元件的声压场。对于弯曲元件,在保持高发射声压的同时测量到了高指向性。通过点扩散函数分析,比较了尺寸为10x10 cm、包含256个元件的矩阵阵列,分别采用小($λ$/2)、大(4$λ$)和弯曲(4$λ$)元件。在经颅配置下,使用该矩阵阵列对一个充满每帧100个微泡的大型合成微血管体模进行了成像。所提出的方法检测到了93%的微泡,这表明多透镜衍射层在实现穿透骨骼的大视场3D ULM方面具有巨大潜力。

英文摘要:

Mapping blood microflows of the whole brain is crucial for early diagnosis of cerebral diseases. Ultrasound localization microscopy (ULM) was recently applied to map and quantify blood microflows in 2D in the brain of adult patients down to the micron scale. Whole brain 3D clinical ULM remains challenging due to the transcranial energy loss which significantly reduces the imaging sensitivity. Large aperture probes with a large surface can increase both resolution and sensitivity. However, a large active surface implies thousands of acoustic elements, with limited clinical translation. In this study, we investigate via simulations a new high-sensitive 3D imaging approach based on large diverging elements, combined with an adapted beamforming with corrected delay laws, to increase sensitivity. First, pressure fields from single elements with different sizes and shapes were simulated. High directivity was measured for curved element while maintaining high transmit pressure. Matrix arrays of 256 elements with a dimension of 10x10 cm with small ( $λ$ /2), large (4 $λ$ ), and curved elements (4 $λ$ ) were compared through point spread functions analysis. A large synthetic microvessel phantom filled with 100 microbubbles per frame was imaged using the matrix arrays in a transcranial configuration. 93% of the bubbles were detected with the proposed approach demonstrating that the multi-lens diffracting layer has a strong potential to enable 3D ULM over a large field of view through the bones.

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。

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