荧光成像仪器的成像性能测试对于提高仪器的性能和临床转化成功率具有重要意义，成像性能测试的标准化需要一种可以精确模拟荧光光谱的长期稳定的样品作为测试工具。本团队提出了一种荧光发光模拟系统，该系统可以模拟荧光样品的激发效率、荧光发射谱特性和荧光空间分布特性，可以替代真实的荧光剂仿体对荧光成像类仪器进行量化表征。该系统采用的是基于线性滤光片和液晶显示器的光谱模拟方法。本团队还设计了一种改进的最小二乘光谱拟合算法，该算法可以自动模拟任意荧光发射谱。使用该系统模拟了近红外荧光造影剂吲哚菁绿(ICG)的发光特性，并对不同荧光成像仪器的成像灵敏度进行了测试。实验结果表明，所设计的荧光发光模拟系统可以稳定精准地模拟荧光样品的发光特性。

Near infrared (NIR) fluorescence imaging guided photodynamic therapy (PDT) is a technique which has been developed in many clinical trials due to its advantage of real-time optical monitoring, specific spatiotemporal selectivity, and minimal invasiveness. For this, photosensitizers with NIR fluorescence emission and high 1O2 generation quantum yield are highly desirable. Herein, we designed and synthesized a "donor–acceptor" (D-A) structured semiconductor polymer (SP), which was then wrapped with an amphiphilic compound (Pluronicr F127) to prepare water-soluble nanoparticles (F-SP NPs). The obtained F-SP NPs exhibit good water solubility, excellent particle size stability, strong absorbance at deep red region, and strong NIR fluorescent emission characteristics. The maximal mass extinction coe±cient and fluorescence quantum yield of these F-SPs were calculated to be 21.7 L/(g·cm) and 6.5%, respectively. Moreover, the 1O2 quantum yield of 89% for F-SP NPs has been achieved under 635 nm laser irradiation, which is higher than Methylene Blue, Ce6, and PpIX. The outstanding properties of these F-SP NPs originate from their unique D-A molecular characteristic. This work should help guide the design of novel semiconductor polymer for NIR fluorescent imaging guided PDT applications.

探索合成方法简单的近红外比率荧光探针具有重要意义。本文以高山榕树叶为碳源，乙醇、丙酮为提取剂，采用溶剂热法于200 ℃高压反应釜中反应10 h，一步合成具有近红外双发射荧光特性的碳量子点(CDs)。透射电镜(TEM)表明合成的CDs分散性好、平均尺寸约为4.70 nm，晶格常数为0.32 nm。X射线衍射(XRD)结果显示该碳点在2θ=22°附近有一个较宽的衍射峰，表明该CDs为sp2杂化的无定形碳。傅里叶红外光谱(FT-IR)显示其含有氨基、羰基、醇羟基和甲基。荧光光谱表明，最大激发波长410 nm，最大发射波长为466 nm和676 nm。以硫酸奎宁做参比测得荧光量子产率为26.31%。实验还探讨了CDs的酸碱、光学、抗盐和金属离子的稳定性以及细胞成像效果。以上结果表明，该碳点具有原料廉价易得、制作简便、对酸碱稳定、抗光漂白性良好等优点，具有良好的光学成像应用前景。

Early detection of vulnerable plaques is the critical step in the prevention of acute coronary events. Morphology, composition, and mechanical property of a coronary artery have been demonstrated to be the key characteristics for the identification of vulnerable plaques. Several intravascular multimodal imaging technologies providing co-registered simultaneous images have been developed and applied in clinical studies to improve the characterization of atherosclerosis. In this paper, the authors review the present system and probe designs of representative intravascular multimodal techniques. In addition, the scientific innovations, potential limitations, and future directions of these technologies are also discussed.

以近红外荧光碳量子点为探针, 以赭曲霉毒素A(OTA)适配体为特异性结合体, 建立了近红外荧光核酸适体OTA传感检测平台。研究显示, 所建立的近红外荧光核酸适体OTA传感对OTA具有高特异性, 其他真菌毒素无明显干扰。研究了传感体系组成、pH值、孵化时间等因素对近红外荧光传感性能的影响, 确定了最优检测条件。在最优检测条件下, OTA 浓度在0.015~1.5 ng·mL-1范围与体系荧光强度恢复呈良好线性关系, 检测限为8 pg·mL-1。该方法用于连翘、葛根、莲子、麦芽、陈皮、甘草等中草药中痕量OTA的测定, 发现这些中药材都存在赭曲霉毒素A的污染。

Objective: We study the biomedical optical properties of the color light and near-infrared fluorescence separated-merged imager. Materials and Methods: The color light and near-infrared fluorescence separated-merged imager can illuminate the visible light and the near-infrared light of 760 ± 10 nm, receiving the reflected light and 835 ± 10 nm near-infrared fluorescence, and display the color, fluorescence and merge image. ICG solution of different concentration, including standing time, was allocated to study the best imaging condition in vitro, and the depth of fluorescence penetration was studied with 5% agarose gel; the imaging characteristics of the imager was studied using SD rat; and then the SLNs tracing in 4 cases of penile carcinoma was performed. Results: When the concentration of ICG is 13.11 μmol/L, the fluorescence intensity and the merge image are the best. The maximum depth of fluorescence imaging is 9mm in 5% agarose gel, while the bone has the greatest influence on it. The SLNs tracing shows that the imager can locate the SLNs in vitro, to achieve perioperative navigation during biopsy. Conclusion: There are many factors that affect the imaging effect, but the imaging effect of the imager meets the requirement of vision in a wide range, and can effectively trace the SLNs in perioperative period.

Previous studies have shown cost effectiveness and quality-of-life benefit of pneumatic compression therapy (PCT) for lymphedema (LE). Insurers, such as the Centers for Medicare/Medicaid (CMS), however, desire visual proof that PCT moves lymph. Near-infrared fluorescence lymphatic imaging (NIRFLI) was used to visualize lymphatic anatomy and function in four subjects with primary and cancer treatment-related LE of the lower extremities before, during, and after PCT. Optically transparent and windowed PCT garments allowed visualization of lymph movement during single, 1h PCT treatment sessions. Visualization revealed significant extravascular and lymphatic vascular movement of intradermally injected dye in all subjects. In one subject with sufficient patent lymphatic vessels to allow quantification of lymph pumping velocities and frequencies, these values were significantly increased during and after PCT as compared to pre-treatment values. Lymphatic contractile activity in patent lymphatic vessels occurred in concert with the sequential cycling of PCT. Direct visualization revealed increased lymphatic function, during and after PCT therapy, in all LE-affected extremities. Further studies are warranted to assess the effects of PCT pressure and sequences on lymph uptake and movement.