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arXiv 2406.01746physics.med-ph
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使用行列阵列在小鼠大脑中进行3D经颅动态超声定位显微镜

3D transcranial Dynamic Ultrasound Localization Microscopy in the mouse brain using a Row-Column Array

Alice Wu, Jonathan Porée, Gerardo Ramos-Palacios, Chloé Bourquin, Nin Ghigo, Alexis Leconte, Paul Xing, Abbas F. Sadikot, Michaël Chassé, Jean Provost

AI总结:

本研究利用行列阵列(RCA)和动态超声定位显微镜(DULM)序列,在小鼠大脑中实现了高时空分辨率的3D经颅血流测量,验证了该方法在脑血管成像中的可行性与可重复性。

摘要:

现有成像技术无法全面评估脑血流动力学在神经退行性疾病中的作用。近期,2D动态超声定位显微镜(DULM)实现了以亚波长分辨率对脉动血流进行定量映射。然而,为获得准确的速度估计,3D成像更为合适,特别是对于大脑这样血管化复杂的器官。使用矩阵阵列探头可实现3D+t DULM,但在成本、与高通道数相关的设备复杂性以及工作频率方面存在局限。作为替代方案,行列阵列(RCA)能在保持大视场和高帧率的同时减少元件数量。在此,我们展示了使用RCA和具备高时空分辨率的DULM序列在小鼠大脑中进行3D+t血流测量的可行性。使用42个倾斜平面波,以750 Hz的体速率采集了麻醉小鼠(n=7)的经颅图像。在对微泡进行定位和追踪后,获得了3D脑血管网络的超分辨动态密度和速度图。对所有小鼠,分割出的皮质血管显示动脉的脉动性显著高于静脉,这与文献相符。我们的结果证明了使用RCA和DULM实现小鼠脑血管高时空分辨率体成像的可行性与可重复性。

英文摘要:

The role of brain hemodynamics in neurodegenerative diseases cannot be fully assessed using existing imaging technologies. Recently, 2D Dynamic Ultrasound Localization Microscopy (DULM) has allowed for the quantitative mapping of the pulsatile flow at sub-wavelength resolution. However, to obtain accurate velocity estimates, 3D imaging is more adapted, especially for complex vascularized organs like the brain. 3D+t DULM is achievable using matrix array probes, but suffers from limitations in terms of cost, device complexity associated with the high channel count, and operating frequencies. Alternatively, Row Column Arrays (RCA) can reduce the number of elements while maintaining a large field of view and high frame rate. Herein, we demonstrate the feasibility of performing 3D+t blood flow measurements in the mouse brain using an RCA and a DULM sequence with a high spatiotemporal resolution. Transcranial images of anesthetized mice (n=7) were acquired at a volume rate of 750 Hz using 42 tilted plane waves. After microbubbles localization and tracking, super-resolved dynamic density and velocity maps of the 3D brain vascular network were obtained. Cortical vessels were segmented and pulsatility in the arteries was significantly higher than in veins for all mice, in accordance with the literature. Our results demonstrate the feasibility and reproducibility of achieving high spatiotemporal resolution volumes of the mouse brain vasculature with DULM using a RCA.

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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