【摘 要】
：
We constructed a flexible gold-polydimethylsiloxane (gold-PDMS) nanocomposites film with controllable thickness and light transmittance, to realize optically-excited simultaneous photoacoustic (PA) and ultrasound (US) imaging under a single laser pulse ir
【机 构】
：
MOEKeyLaboratoryofLaserLifeScience,SouthChinaNormalUniversity,Guangzhou510631,P.R.ChinaInstituteofLa
【出 处】
：
JournalofInnovativeOpticalHealthSciences
论文部分内容阅读
We constructed a flexible gold-polydimethylsiloxane (gold-PDMS) nanocomposites film with controllable thickness and light transmittance, to realize optically-excited simultaneous photoacoustic (PA) and ultrasound (US) imaging under a single laser pulse irradiation. Benefiting from the excellent thermoelastic properties, the gold-PDMS film absorbs part of the incident laser energy and produces a high-intensity US, which is used to realize US imaging. Meanwhile, the partly transmitted light is used to excite samples for PA imaging. By controlling the thickness of the gold-PDMS, we can control the center frequency in the US imaging. We experimentally analyzed the frequency of the produced US signal by the gold-PDMS film and compared it with the finite element analysis (FEA) method, where the experiments agree with the FEA results. This method is demonstrated by the experiments on phantoms and a mouse model. Our work provides a cost-effective methodology for simultaneous PA and US imaging.
其他文献
利用激光诱导击穿光谱(LIBS)技术与基于遗传算法优化的误差反向传播(GA-BP)神经网络对常见的9种塑料进行分类识别。通过激光诱导击穿塑料表面产生等离子光谱,用光谱仪对每种塑料采集100组光谱数据,以美国国家标准与技术研究院(NIST)的原子光谱数据库为参考,对主要的元素特征谱线进行精确标定。选取15条特征谱线进行分析,通过主成分分析(PAC)法对光谱数据进行降维处理,并建立GA-BP神经网络模型。实验结果表明,通过PCA法对数据进行降维后,GA-BP神经网络的识别效率得到很大提高,平均识别精度为99.
By optimizing the gain configuration and length of the loop, a 90-tone optical frequency comb (OFC) is successfully generated based on recirculating frequency shifter structure. The peak-to-peak power fluctuation of the 90-tone OFC is 4.26 dB and the tone
采用时域有限差分(FDTD)法,对由银-氧化铟锡(ITO)薄膜构成的一维光子晶体结构在300~800 nm波段范围内的滤波特性进行了研究。仿真研究了金属缺陷层厚度、入射角度和ITO膜厚度等对光子晶体滤波特性的影响。对不同参量下光子晶体结构的色散曲线也进行了仿真计算,并分析了色散机理。结果表明,改变缺陷层的厚度能够调制光子晶体的滤波范围及滤波波形;入射光线小角度范围(0°~20°)内的变化对该光子晶体滤波性能的影响甚微;随着ITO膜厚度的增加,滤波波谱呈周期性变化。
对于弱吸收薄腹,当薄膜和基底的折射率在一定数值范围内时,含有吸收比的公式可以用来计算薄膜的消光系数.该式不能用来计算已经没有干涉效应的厚的强吸收膜的消光系数.
提出了应用于光刻机照明系统照明光场均匀性的高精度校正方法,该方法通过优化手指阵列式均匀性校正器中校正手指前端的形状及其排布方式来提高校正能力和精度。仿真结果表明:当校正手指错开排布时,手指阵列式均匀性校正器的校正精度优于0.2%;当校正手指的前端有倒斜角且双层错开排布时,手指阵列式均匀性校正器的校正精度优于0.16%,比常规手指阵列式均匀性校正器的校正精度提高约一倍。
Many papers have been published on the theory of magnetic insulation and the use of Zflow analysis of magnetically insulated transmission lines (MITLs). We describe herein a novel design process using the circuit code SCREAMER for
A 100-Gb/s high-speed optical transmitter is proposed and experimentally demonstrated. Based on frequency-quadrupling technique, two sub-channels with a fixed 50-GHz spacing are obtained from one laser source. Using return-to-zero differential quadrature
结合同轴X射线相位衬度成像(XPCI)中的Born近似相位恢复法和CT技术,实现了基于单一物像距同轴X射线相位衬度CT(IL-XPCT)投影图像的相位恢复切片重构方法。利用上海光源X射线成像及生物医学应用光束线站的单色光开展模型和生物样品(蝗虫)IL-XPCT研究。对比显示,进行相位恢复后,能获得更好的IL-XPCT重构切片和三维重建图像。实验结果表明,本方法具有用于生物活体样品三维无损成像研究的
在超高真空的条件下,测量了清洁、自由银表面产生的光学二次谐波随基波电矢量与入射面之间夹角(?)的变化,从而通过理论公式,求得由Rudnick和Stern引入的,用于衡量垂直面电流密度的唯象参数a的值,在入射基频光波长为1.064μm时,被测定为-4.0±0.8.