基于字典学习的稀疏角度采样光声信号重建

来源 :光学学报 | 被引量 : 1次 | 上传用户:yaoyaosara
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
光声成像兼具光学成像的高对比度和超声成像对深层组织的高分辨率等优点,在生物医学成像领域具有巨大的潜力,而且发展十分迅速;光声成像通过在多个角度进行光声信号的采集,可以获得生物组织的二维或三维光学吸收分布图像;但实际的光声成像往往因硬件条件和成像时间的制约而难以采集角度足够多的光声信号;在信号采样不足的情况下,光声图像的重建质量会严重下降,出现大量伪迹。针对该问题,提出了一种基于字典学习与稀疏表示的恢复重建算法,采用该算法对光声信号进行预处理,并进行仿真实验。结果表明:与不经过光声信号超分辨率重建的时
其他文献
The nanorod structure is an alternative scheme to develop high-efficiency deep ultraviolet light-emitting diodes (DUV LEDs). In this paper, we first report the electrically injected 274-nm AlGaN nanorod array DUV LEDs fabricated by the nanosphere lithogra
期刊
以分子吸收线作基准对激光频率(波长)进行稳定,稳定度很快就突破大关, 1973年达到了10-12量极的水平。其后,这工作在美、苏、日、德、英、法等国展开,均确切地获得了10-12~10-13的稳定度,并尝试向10-14目标进军。
期刊
Myopia has become a noteworthy issue due to the increasing use of our eyes. We propose a continuous power variation vision-training device based on Alvarez lenses with the power ranging from
期刊
期刊
The operational procedures for efficiently reconstructing the two-dimensional image of a body by the filtered back projection are described in this paper. The projections are interpolated for four times of original projection by zero-padding the original
提出了测量惯性转动的新方法。它的根据是将无源环形谐振腔用作转动的敏感元件,用外激光器测量谐振腔的顺时针和逆时针的长度之差。包括了初步性能数据。
期刊
A photonic front-end in the 5G wireless network based on wavelength-division multiplexing optical communication requires low-cost tunable transceivers. By exploiting polymer waveguide Bragg-grating technology, we propose a tunable transceiver consisting o
期刊
The basic optical properties of the newly synthesized pyrromethene-BF2 derivative (Compound 1) were investigated systematically by its ultraviolet to visible (UV-visible) absorption, fluorescence and triplet-triplet absorption. Its lasing characteristics
本文采用LiNbO3晶体作为动态全息存储元件和相位共轭反射镜,实现了全光学联想存储器。提出了正交参考光束法存储图像,用于以上结构时,可使联想存储器的存储容量提高一倍。