In this paper we report on the first toroidally focused 2D real-time laser-ultrasonic imaging system and a modified filtered back projection algorithm that can be used in the region near the waist of the astigmatic laser-ultrasonic probe beam. The system is capable of visualizing an acupuncture needle 0.2 mm in diameter located at ∼4 cm depth in water. The lateral spatial resolution is better than ∼0.32 mm and axial spatial resolution is ∼30 μm. The achieved frame rate is up to 30 Hz. The depth dependency of the sensitivity region width and lateral resolution are experimentally measured and discussed. The array is intended to be used as a part of combined real-time photoacoustic and laser-ultrasonic imaging system.

在本文中，我们报告了第一个环形聚焦二维实时激光超声成像系统和一种改进的滤波反投影算法，该算法可用于像散激光超声探测光束腰部附近的区域。该系统能够可视化位于水中约 4 厘米深度的直径 0.2 毫米的针灸针。横向空间分辨率优于~0.32 mm，轴向空间分辨率为~30 μm。实现的帧速率高达 30 Hz。通过实验测量并讨论了敏感区域宽度和横向分辨率的深度依赖性。该阵列旨在用作实时光声和激光超声成像组合系统的一部分。