Particle distribution estimation is an important issue in medical diagnosis. In particular, photon scattering in some medical devices extremely degrades image quality and causes measurement inaccuracy. The Monte Carlo (MC) algorithm is regarded as the most accurate particle estimation approach but is still time-consuming, even with graphic processing unit (GPU) acceleration. The goal of this work is to develop an automatic scatter estimation framework for high-efficiency photon distribution estimation. Specifically, a GPU-based MC simulation initially yields a raw scatter signal with a low photon number to hasten scatter generation. In the proposed method, assume that the scatter signal follows Poisson distribution, where an optimization objective function fused with sparse feature penalty is modeled. Then, an over-relaxation algorithm is deduced mathematically to solve this objective function. For optimizing the parameters in the over-relaxation algorithm, the deep $Q$-network in the deep reinforcement learning scheme is built to intelligently interact with the over-relaxation algorithm to accurately and rapidly estimate a scatter signal with the large range of photon numbers. Experimental results demonstrated that our proposed framework can achieve superior performance with structural similarity $ 其他文献 白藜芦醇与人血清白蛋白相互作用的光谱研究 在不同温度下,用荧光猝灭光谱、同步荧光光谱和紫外-可见吸收光谱,研究了白藜芦醇与人血清白蛋白(HSA)相互作用的光谱学行为。根据不同温度下白藜芦醇对HSA的荧光猝灭作用,利用Stern-Volmer方程处理实验数据,结果表明白藜芦醇与HSA的结合常数KA为2.39×105(25 ℃),1.25×105(35 ℃)和1.10×105(45 ℃)。根据Frster非辐射能量转移理论,求出了白藜芦醇与HSA之间的结合距离为3 期刊 白藜芦醇HSA相互作用荧光光谱ResveratrolHuman serum albuminInteractionFluorescence spec Intensity modulation of a tightly focused partially coherent and radially polarized beam Because of the circular symmetry of a completely coherent radially polarized beam, the azimuthal intensity component is zero when it is focused by a high numerical aperture (NA) objective. In this paper, we show that such a conclusion is not tenable under 期刊 一种基于修正直方图的图像增强算法 针对雾天降质图像对比度低的问题,提出了一种基于修正直方图的图像增强算法。统计图像的直方图时,每个像素分为两部分,一部分累加到当前像素灰度级,剩余部分按灰度级平均分配,实现直方图的修正,然后根据修正直方图产生灰度映射函数,由于每个像素只有一部分累加到当前灰度级,这样可以避免局部图像的过度增强。实验表明,该算法比经典的直方图均衡化算法、局部直方图均衡化算法有更好的增强效果。 期刊 修正直方图雾天降质图像图像增强图像去雾图像对比度generalized histogramfog-degraded imageimage enha Terahertz out-of-plane coupler based on compact spot-size converter Low-loss dielectric terahertz (THz) chips are efficient platforms for diverse THz applications. One of the key elements in the chip is the coupler. Most of the available THz couplers are in-plane and couple the THz wave from the metal waveguide to the die 期刊 terahertz devicegrating couplerspot-size converterbeam steering WAVELET-BASED ANALYSIS OF CEREBROVASCULAR DYNAMICS IN NEWBORN RATS WITH INTRACRANIAL HEMORRHAGES Intracranial hemorrhage (IH) is a major problem of neonatal intensive care. The incidence of IH is typically asymptomatic and cannot be effectively detected by standard diagnostic methods. The mechanisms underlying IH are unknown but there is evidence tha 期刊 Brain hemorrhagesoptical coherence tomographycerebrovascular dynamicswavelet 旁轴高斯光束传输性质的矩阵表示及稳定光腔和非稳定光腔模式的统一处理 本文给出对旁轴高斯光束及其传输性质的矩阵表示,把轴高斯光束情况下的ABCD定律推广到旁轴情况.本文还统一处理稳定腔和非稳定腔的模式. 期刊 用超荧光光源实现HCN分子2ν3带红外振转谱测量 采用超荧光光源(SFS)搭建了一个新型的气体吸收谱线测量装置，成功实现了对13.332 kPa气压下H13C14N(HCN)气体分子2ν3振动带精细结构的准确测量。分析了双程后向(DPB)结构的SFS和HCN分子的结构及振动转动模式，所采用的SFS在2 mW输出功率下，激发了2ν3振动带J=0-27的转动能级，输出谱在波长1525.3-1560.3 nm之间平坦度小于1 dBm，可以直接覆盖测量50多条振转谱线，无需多 期刊 测量激光器超荧光光源HCN分子红外振转谱measurementslaserssuper fluoresent sourceHCN molecul 红外与毫米波学报2018年第37卷 总目录 期刊 偏振部分相干激光斜程湍流大气传输的漂移扩展 采用光场的一阶矩和二阶矩作为评价参数，研究了偏振部分相干激光波束在斜程湍流大气传输中的漂移效应和扩展效应。根据推广的惠更斯菲涅耳原理，以椭圆偏振部分相干激光波束为研究对象，推导了斜程传输情况下波束的重心坐标、扩展半径和扩展角的表达式，数值分析了偏振波束两正交分量的相位差、方向角、波长、初始束腰半径和接收机高度对波束漂移及扩展的影响。结果表明，在确定的斜程传输距离和接收机高度下，随着偏振波束两正交分量相位差的增大，漂移效应先增大后减小，在确定的斜程传输距离下，接收机高度越高,波束的漂移效应和扩展效应越小。 期刊 大气光学湍流效应推广的惠更斯菲涅耳原理偏振部分相干激光斜程传输atmospheric opticsturbulence effectsextend 用ATR方法研究LB单分子膜层的等温热脱附过程 对由有机长链花生酸分子所组成的Langmuir-Blodgett单分子膜层(LB膜)的多层结构,利用衰减全反射方法进行了等温热脱附研究,提出了一个物理模型以描述LB膜的脱附过程,得到了LB膜中花生酸分子的不同吸附端的层间脱附能,疏水端为19kcal/mol;亲水端为27kcal/mol. 期刊 与本文相关的学术论文 $