Shu Pan 1,2Li Wang 1,2Yuanzheng Ma 3Guangyu Zhang 1,2[ ... ]Sihua Yang 1,2,*
Author Affiliations
Abstract
1 South China Normal University, College of Biophotonics, MOE Key Laboratory of Laser Life Science and Institute of Laser Life Science, Guangzhou, China
2 South China Normal University, College of Biophotonics, Guangdong Provincial Key Laboratory of Laser Life Science, Guangzhou, China
3 Tsinghua University, Tsinghua-Berkeley Shenzhen Institute, Tsinghua Shenzhen International Graduate School, Shenzhen, China
4 Guangzhou Medical University, School of Biomedical Engineering, Guangzhou, China
5 Guangdong Laboratory Animals Monitoring Institute, Guangdong Key Laboratory of Laboratory Animals, Guangzhou, China
Accurate localization of blood vessels with image navigation is a key element in vascular-related medical research and vascular surgery. However, current vascular navigation techniques cannot provide naked-eye visualization of deep vascular information noninvasively and with high resolution, resulting in inaccurate vascular anatomy and diminished surgical success rates. Here, we introduce a photoacoustic-enabled automatic vascular navigation method combining photoacoustic computed tomography with augmented and mixed reality, for the first time, to our knowledge, enabling accurate and noninvasive visualization of the deep microvascular network within the tissues in real time on a real surgical surface. This approach achieves precise vascular localization accuracy (<0.89 mm) and tiny vascular relocation latency (<1 s) through a zero-mean normalization idea-based visual tracking algorithm and a curved surface-fitting algorithm. Further, the subcutaneous vessels of minimum diameter (∼0.15 mm) in rabbit thigh and the maximum depth (∼7 mm) in human arm can be vividly projected on the skin surface with a computer vision-based projection tracking system to simulate preoperative and intraoperative vascular localization. Thereby, this strategy provides a way to visualize deep vessels without damage on the surgical surface and with precise image navigation, opening an avenue for the application of photoacoustic imaging in surgical operations.
photoacoustic imaging image navigation augmented reality mixed reality vascular localization 
Advanced Photonics Nexus
2023, 2(4): 046001
作者单位
摘要
山东科技大学测绘与空间信息学院,山东 青岛 266590
针对采用水平二维中线进行大纵坡隧道横断面提取时误差较大的问题,提出一种高效的隧道点云三维中轴线与横断面提取方法。首先采用边界格网和角度双重约束,提取隧道二维边界点;然后对边界点进行多条件约束的迭代最小二乘拟合,提取水平中线点和侧面中线点,进而将侧面中线点正射投影至水平中线点所在的竖直曲面,得到三维中轴点;最后引入微元思想确定三维中轴点对应的法平面方程,将法平面两侧一定厚度的点云投影至该平面,实现隧道横断面提取。结果表明,该方法能够准确提取隧道三维中轴线和横断面,横断面提取误差在3.06%以内,适用于各种纵坡的直线型、弯曲型隧道。
遥感 隧道激光点云 三维中轴线 横断面 迭代最小二乘 
激光与光电子学进展
2022, 59(8): 0828006
作者单位
摘要
1 吉林交通职业技术学院电子信息学院, 吉林 长春 130012
2 长春理工大学国有资产管理处, 吉林 长春 130022
提出了一种基于显著性特征的可见光与红外图像融合算法来改善目标的融合质量。引入显著检测器对红外图像进行处理, 生成显著映射;进一步分析红外图像并检测兴趣点,提取图像中的显著兴趣点;通过计算显著兴趣点的凸壳确定显著区域;利用显著兴趣点凸壳 对初始显著映射进行优化,使目标定位更加精确。根据区域映射获取可见光图像的背景区域;根据不同的融合准则对目标、背景区域进行融合, 获得最终的融合图像。结果表明与当前可见光图像融合技术相比,所提算法在标准差、联合熵与边缘信息因子等指标方面具有优势, 其融合图像的细节纹理更清晰。
图像处理 图像融合 显著性映射 兴趣点凸壳 融合准则 image processing image fusion saliency mapping interest points convex hull fusion criterion 
量子电子学报
2017, 34(5): 540
作者单位
摘要
1 中国科学院核能安全技术研究所, 安徽 合肥 230031
2 安徽建筑大学电子与信息工程学院, 安徽 合肥 230601
采用频域多帧循环迭代解卷积算法(CIBD),针对提高复原图像的准确性和快速性两个方面进行研究。以退化序列中任意帧作为起始帧,逐次增加迭代帧,确保更多的观测帧参与循环迭代解卷积以增加复原的准确性;通过图像间的相关矩阵估计初始点扩展函数(PSF),采用尺度梯度投影法,自适应迭代步长,增加迭代终止条件等措施提高算法的收敛速度。实验结果表明,采用提议的算法能够有效地重建不同大气湍流条件下的远距离观测图像,性能优于传统多帧盲反卷积(MBD)迭代算法。
大气光学 盲反卷积 循环迭代 多尺度投影梯度 自适应迭代步长 
激光与光电子学进展
2014, 51(7): 071002
作者单位
摘要
哈尔滨工业大学机电工程学院, 黑龙江 哈尔滨 150001
研制出一种分程式双灵敏度的光纤光栅压力/温度一体化监测装置。利用分程式的封装结构,在没有改变光纤光栅其他监测指标前提下,增大了压力测量范围。通过设定封装结构尺寸及材料使该装置实现压力/温度双灵敏度一体化监测。进行了压力/温度监测性能实验,实验结果表明,该监测装置的压力监测范围为0~30 MPa,温度监测范围0 ℃~150 ℃。在0~15 MPa、15~30 MPa监测范围内压力灵敏度分别为352.5 pm/MPa和223.3 pm/MPa,线性拟合度分别为99.42%和99.33%;温度灵敏度分别为33.5 pm/℃和22.5 pm/℃,线性拟合度分别为99.69%和99.61%。该传感器结构简单、性能指标优越,具有较高的应用价值。
光栅 光纤光栅 压力/温度监测 分程式 双灵敏度 
中国激光
2013, 40(2): 0205005
Author Affiliations
Abstract
The effect of hydrostatic pressure (up to 28 MPa) on Brillouin frequency shift (BFS) within two types of bare, single-mode fibers is studied via Brillouin optical time domain analysis technique. Experimental results show a negative linear relation between pressure and BFS, with almost the same sensitivity in both types of fibers. The average value of experimental slopes is –0.742 MHz/MPa. This value is found to be well suited to theoretical analysis on the basis of data on bulk silica glass in previous reports. This preliminary evaluation may result in a new method for distributed pressure sensing along silica optical fiber.
060.0060 Fiber optics and optical communications 060.4370 Nonlinear optics, fibers 120.5820 Scattering measurements 060.2370 Fiber optics sensors 
Chinese Optics Letters
2012, 10(10): 100604
Author Affiliations
Abstract
School of Mechanical and Electronical Engineering, Harbin Institute of Technology, Harbin 150001
In order to increase the multiplexing density of the fiber Bragg gratings (FBGs) for a low cost per-sensor, based on the analysis of the spectrum shadow distortion (SSD), a novel successive demultiplexing scheme for FBG sensors has been developed. It is based on the optical code division multiple access (CDMA) balanced demodulation. A high-density multiplexing-demultiplexing system for FBG sensors has been designed, and corresponding simulation carried out has demonstrated that the FBG sensors’ reflective signals can still be obtained accurately and respectively, even if FBG sensors’ operating bandwidths heavily overlap. The SSD has been greatly mitigated.
FBG传感器 复用 网络 060.2370 Fiber optics sensors 060.4230 Multiplexing 060.4250 Networks 
Chinese Optics Letters
2009, 7(1): 0123

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