基于双聚类和可视化的重金属污染领域研究热点探析

目的 探究2006-2015年间国内重金属污染领域文献的研究热点.方法 以中国知网数据库重金属污染的文献数据为研究对象,采用BICOMB软件生成70个高频关键词的词篇矩阵,将该矩阵导入gCLUTO软件中进行双聚类分析并可视化,得到重金属污染的研究热点.结果 重金属污染文献聚类结果主要集中在5个方面.包括重金属污染对农作物的影响;重金属污染造成的生态风险及评价;植物对重金属污染的防治作用;土壤重金属的生物有效性;重金属污染造成的食品安全及人体健康风险问题.结论 通过双聚类分析和可视化,可以得出当前重金属污染领域的研究热点,从而为科研人员和环保部门提供一定的参考依据.     

正念的研究现状——基于ISI Web of Science数据库的CiteSpace分析

为总结当前正念研究的现状,探究未来的研究方向。利用可视化分析软件CiteSpaceⅢ对2009年-2018年ISI Web of Science数据库中7 395篇有关正念的文献进行作者、机构和关键词分析,挖掘正念研究领域的作者间、机构间合作情况和研究现状。结果显示,十年中正念研究领域内各作者多以小团体为单位进行合作,机构间的合作具有整体性,研究现状主要体现在正念的临床应用。     

基于文献学的国内分级诊疗研究分析

随着分级诊疗制度的进一步推行,针对分级诊疗相关政策、实践的研究成为当前医改政策研究的一个热点。以“中国知网”数据库四大主要来源期刊库作为数据来源,以2012年-2018年发表的347篇文献作为样本,采用文献计量学研究方法并借用可视化软件CiteSpaceⅢ作为分析工具,绘制国内从事分级诊疗研究的机构、作者的现状与研究热点图谱。通过关键词聚类和关键词频度分析发现,双向转诊、医联体、社区卫生服务、医疗联合体、全科医生是分级诊疗研究的热点,同时发现机构、作者之间合作及研究议题的深度和广度富有广阔前景,为国家制定相关卫生政策提供了依据     

医学图像可视化及加速技术的研究进展和趋势****☆

摘要：近年来图像可视化技术蓬勃发展,相应的各种加速算法也层出不穷,本文将尝试就此内容进行综述和概括。首先介绍可视化技术的两大分支——面绘制和体绘制的含义和主要特点;其次详细介绍体绘制技术中一些典型算法的基本原理及各自特点;然后分别从软件和硬件角度归纳体绘制技术中常用的加速技术;最后展望医学图像可视化及加速技术的发展趋势。     

A Functional Map of Cervical Metastases from Oral Squamous Cell Carcinoma

A visual summary of underlying patterns in metastases from oral squamous cell carcinoma (SCC) was created by the mathematical technique of multidimensional scaling (MDS). MDS creates a "functional" map of the neck, such that adjacent sites share similar probabilities of disease. We mapped the metastases from 130 sequential cases of oral SCC in the UK. Binary Euclidean distances were calculated from tallies of metastases at all possible pairs of neck levels (I-V on each side) for each of seven different primary sites: buccal mucosa, lower alveolus, floor of mouth, ventral tongue/floor of mouth, lateral tongue, retromolar trigone, and oropharynx. A two-dimensional functional map of the neck was made from these distances. The map explains 82% of the input data (p < 0.01). This is the first functional mapping of neck levels. The technique can now be used to summarize and compare patterns of metastases in different populations.     

The disembodied eye: Consequences of displacing perception from action

In our research, people use actions to expose hidden targets as planar images displayed either in situ or ex situ (displaced remotely). We show that because ex situ viewing impedes relating actions to their perceptual consequences, it impairs localizing targets, including compensating for surface deformation, and directing movement toward them. Using a 3D analogue of anorthoscopic perception, we demonstrate that spatio-temporal integration of contiguous planar slices is possible when action and perception are co-located, but not when they are separated. Ex situ viewing precludes the formation of a spatial frame of reference that supports complex visualization from action.     

基于百度地图的钉螺监测系统的实现

目的基于百度地图构建钉螺监测系统。方法收集历史有螺、现有螺等钉螺监测环境基础信息及各类钉螺监测数据,建立钉螺监测数据库,利用地理信息系统(Geographic Information System,GIS)电子围栏技术及百度地图开发者接口(Application Program Interface,API)完成各钉螺监测环境的电子围栏设定,并完成电子围栏同钉螺监测数据库的关联。结果基于百度地图建立了钉螺监测系统。该系统包含"钉螺监测环境数据库"、"动态监测端"、"电子地图展示"3个模块。通过PC端、智能手机端,均可在百度地图上查看钉螺监测信息。结论基于百度地图开发的钉螺监测系统,可以作为查、灭螺等钉螺监测资料数字化、动态化管理的工具,以及可视化展现的平台。     

Four-dimensional flow magnetic resonance imaging in cirrhosis

Since its introduction in the 1970’s, magnetic resonance imaging (MRI) has become a standard imaging modality. With its broad and standardized application, it is firmly established in the clinical routine and an essential element in cardiovascular and abdominal imaging. In addition to sonography and computer tomography, MRI is a valuable tool for diagnosing cardiovascular and abdominal diseases, for determining disease severity, and for assessing therapeutic success. MRI techniques have improved over the last few decades, revealing not just morphologic information, but functional information about perfusion, diffusion and hemodynamics as well. Four-dimensional (4D) flow MRI, a time-resolved phase contrast-MRI with three-dimensional (3D) anatomic coverage and velocity encoding along all three flow directions has been used to comprehensively assess complex cardiovascular hemodynamics in multiple regions of the body. The technique enables visualization of 3D blood flow patterns and retrospective quantification of blood flow parameters in a region of interest. Over the last few years, 4D flow MRI has been increasingly performed in the abdominal region. By applying different acceleration techniques, taking 4D flow MRI measurements has dropped to a reasonable scanning time of 8 to 12 min. These new developments have encouraged a growing number of patient studies in the literature validating the technique’s potential for enhanced evaluation of blood flow parameters within the liver’s complex vascular system. The purpose of this review article is to broaden our understanding of 4D flow MRI for the assessment of liver hemodynamics by providing insights into acquisition, data analysis, visualization and quantification. Furthermore, in this article we highlight its development, focussing on the clinical application of the technique.