Classification decision tree algorithm assisting in diagnosing solitary pulmonary nodule by SPECT/CT fusion imaging

Objective To develop a classification tree algorithm to improve diagnostic performances of 99mTc-MIBI SPECT/CT fusion imaging in differentiating solitary pulmonary nodules (SPNs). Methods Forty-four SPNs, including 30 malignant cases and 14 benign ones that were eventually pathologically identified, were included in this prospective study. All patients received 99Tcm-MIBI SPECT/CT scanning at an early stage and a delayed stage before operation. Thirty predictor variables, including 11 clinical variables, 4 variables of emission and 15 variables of transmission information from SPECT/CT scanning, were analyzed independently by the classification tree algorithm and radiological residents. Diagnostic rules were demonstrated in tree-topology, and diagnostic performances were compared with Area under Curve (AUC) of Receiver Operating Characteristic Curve (ROC). Results A classification decision tree with lowest relative cost of 0.340 was developed for 99Tcm-MIBI SPECT/CT scanning in which the value of Target/Normal region of 99Tcm-MIBI uptake in the delayed stage and in the early stage, age, cough and specula sign were five most important contributors. The sensitivity and specificity were 93.33% and 78. 57e, respectively, a little higher than those of the expert. The sensitivity and specificity by residents of Grade one were 76.67% and 28.57%, respectively, and AUC of CART and expert was 0.886±0.055 and 0.829±0.062, respectively, and the corresponding AUC of residents was 0.566±0.092. Comparisons of AUCs suggest that performance of CART was similar to that of expert (P=0.204), but greater than that of residents (P<0.001). Conclusion Our data mining technique using classification decision tree has a much higher accuracy than residents. It suggests that the application of this algorithm will significantly improve the diagnostic performance of residents.     

舰船大容量变压器励磁涌流的故障识别

舰船电力系统已经逐步由传统的低压电力系统过渡到中压电力系统,变压器在舰船电力系统中地位和作用也日益凸现,对变压器的保护也日益重要,尤其是在发生短路故障时,迅速可靠的跳闸,是保证变压器安全的重要手段。大容量变压器的内部短路故障主要依靠差动保护,而励磁涌流往往会引起差动保护误动作,因此如何快速识别励磁涌流是确保变压器安全可靠的前提条件。     

透过港口看经济

港口是经济运行的"晴雨表",它们完成了全国近七成的外贸出口量,上下游有数以千万计的外贸企业和市场,透过它们,触摸经济脉搏。港口是经济运行的"晴雨表",记者近日走访上海港、宁波港、苏州港、广州港、连云港港等五大港口,透过这些"窗口",触摸经济脉搏。港口:"以前是船等码头,眼下是码头等船"苏州港地处长江入海口咽喉地带,以3.8亿吨的年货     

我国会计电算化的现状及对策

进入21世纪以来,随着经济全球化趋势的不断发展,我国经济发展日新月异,会计电算化已经成为企业经济管理系统的重要组成部分,在国民经济各个部门的应用日益普及。但在我国会计电算化高速发展的同时,也不可避免地出现了一些问题,本文就我国目前会计电算化发展的现状作出分析,并就这些问题提出切实可行的对策。     

基于大数据平台的铁路电务专业数据可视化交互系统

铁路电务专业数据复杂、种类繁多、实时性较强,通过大数据平台对数据进行整合汇集、即时共享、可视化交互展现,可以更直观地分析数据,更有效地利用数据,进而及时发现并处理问题.基于大数据平台的铁路电务专业数据可视化交互系统基于大数据技术架构,利用前端可视化图形库,结合地理信息服务组件,为铁路电务专业不同类别的用户提供多维度、多...     

加快珠海高栏海铁联运发展的对策研究

加快发展海铁联运,对落实运输结构调整,改善生态环境,促进区域经济协调发展具有重要意义.文章在分析珠海高栏海铁联运现状的基础上,对珠海高栏发展海铁联运的优势、劣势及外部机遇、挑战进行SWOT分析.然后,以政策和环境为指导方向,针对珠海高栏的发展海铁联运特点,制定海铁联运发展战略.     

一种汽车空调控制器数据处理系统的设计

针对汽车空调控制器稳定性分析的需求,开发了一种空调控制器数据处理系统,使用Python语言对空调出风口温度性能曲线进行趋势提取以及数据分析,并通过Laravel框架搭建Web应用网站,实现对Python脚本的调用。工程师只需要通过网站上传测试数据,即可准确快速地得到可视化的图表结果,提升了空调控制器数据处理的效率。     

航海促进维生素的发现

营养不良的悲剧人类开始航海的早期,舰船上卫生条件极差,又根本不懂得营养,因此大批水手患病、死亡。据记载,公元533年6月,东罗马远征军在君士坦丁堡上船,浩浩荡荡500艘船(最大载重750吨,最小只有45吨),由2万名水手驾驶着;随护的有92艘快速小战船,由2千名拜占庭奴隶划桨。因为风向不利,他们在罗奔尼撒的梅多尼停留了很久时间,仅由于食物缺乏,营养不佳,竟有500人倒毙于疾病之下。国外历史学家打趣地说:“如果人类早一些了解人体营养基本需要的话,可以避免水手在远航中死亡,也     

交流配电板中功率表接线错误的改正

在制造和修理船舶交流配电板时，常遇见交流功率表指示不准确的问题。除仪表本身出现的故障或转换开关接触不良，熔断器烧断等原因外，仪表接线不正确或互感器、仪表对应端接线不对也会造成指示不准确。解决接线问题很棘手，如按排列组合的方法调换接线，最多时需要调换47次。我们根据多年的经验就三相有功测量及三相功率表的接线作一简单的分析，从中摸索出一套改正功率表错误接线的方法。