基于血管边缘特征的眼底荧光血管造影图像拼接

根据眼底荧光血管造影图像的特点,提出了一种基于血管边缘特征的图像拼接方法.首先,对在眼底荧光血管造影图像进行预处理的基础上,利用小波边缘检测算法检测出血管的图像边缘;然后,基于链码描述方法进行特征匹配;最后,采用了一种基于局部区域灰度信息的图像融合方法对眼底荧光血管造影图像进行拼接.数据处理结果表明,该方法能够得到较理...     

数字化血管减影造影手术教学系统的设计

充分利用医院现有网络资源,设计了一套数字化血管减影造影（DSA）手术教学系统,系统前端采集的信号主要包括手术视音频、心电监护信号等。通过控制分发传输系统、终端示教系统展示手术过程中的所有信息,同时还设专门语音双向传输系统。通过实际应用,DSA手术中的视频、实时透视和造影图像、声音等信号传输一切正常,该系统适用于DSA手术的教学。     

数字化眼底彩照及荧光血管造影诊断糖尿病视网膜病变临床分析

目的观察数字化眼底彩照及荧光血管造影对糖尿病视网膜病变的诊断价值.方法?对糖尿病视网膜病变患者60例进行数字化眼底彩照及荧光血管造影检查,对比诊断准确率.结果?数字眼底彩照诊断左眼准确90.20%,右眼92.31%,组间比较,P>0.05.结论?数字化眼底彩照及荧光血管造影诊断糖尿病视网膜病变均有较高的应用价值.     

蓝韵医用X射线装置＂雅典娜＂

Athena多功能数字化X线透视摄影系统是蓝韵成功研发的新一代医用数字X线诊断系统。全面兼顾摄影、透视、造影检查的数字化解决方案。采用蓝韵医疗最新数字影像技术。既能进行大尺寸的平板静态图像采集,又能通过影增CCD电视系统进行动态图像采集,使临床检查手段更加丰富。     

大型数字化平板DSA设备技术新进展

数字减影血管造影(DSA)设备新技术发展非常迅速,目前数字化平板DSA已经取代影像增强器DSA成为数字减影设备发展的主流方向。本文以SIEMENS artis zee ceiling为例,从平板探测器数字影像采集、高压发生器和球管、导管床机架系统、图像显示及存储、X射线防护和配套设施、DSA高级功能等方面就大型数字化平板DSA设备的进展作一较详细的介绍,对旋转DSA、三维DSA图像重建、3D血管路径图和步进DSA等先进功能的发展以及临床使用作相关探讨。     

YD-100型数字减影血管造影系统的研制

本文介绍的ＹＤ－１００型数字减影血管造影系统采用了高速度大容量的图像帧存储器、计算机对Ｘ线机的连机控制、脉冲方式下的图像采集、数字电影和软件模块化设计等先进技术。临床应用表明该系统有良好的应用前景。     

第68届中国国际医疗器械秋季博览会展品选介

蓝韵医用X射线装置"雅典娜"Athena多功能数字化X线透视摄影系统是蓝韵成功研发的新一代医用数字X线诊断系统。全面兼顾摄影、透视、造影检查的数字化解决方案。采用蓝韵医疗最新数字影像技术。既能进行大尺寸的平板静态图像采集,又能通过影增CCD电视系统进行动态图像采集,使临床检查手段更加丰富。     

58例前部缺血性视神经病变的临床分析

目的：观察前部缺血性视神经病变的视野检查和眼底荧光血管造影等特征,探讨其对前部缺血性视神经病变的临床应用价值。方法：对58例（58眼）前部缺血性视神经病变的视野和眼底荧光血管造影的图像进行分析。结果：眼底表现以视盘苍白水肿为最常见。视野主要表现为与生理盲点相连的象限性、相对性或绝对性缺损,其中上方缺损9眼（占15.5%）,下方缺损21眼（占36.2%）。大部分36眼（62.1%）眼底荧光血管造影表现为早期视盘缺血区弱荧光,晚期荧光增强。结论：本组病例42只眼（占72.4%）仅依靠眼底荧光血管造影表现可以确定视盘缺血的部位,16只眼（占27.6%）视盘缺血部位的确定需要结合视野检查结果。因此,视野检查结合眼底荧光血管造影可提高前部缺血性视神经病变的诊断率。     

数字眼底荧光造影和图像分析系统在诊断和治疗AMD中的应用

目的:探讨眼底数字荧光素血管造影(fundus fluorescein angiog-raphy,FFA)和图像分析系统在年龄相关性黄斑变性(age-related macular degeneration,AMD)的诊断和治疗中的应用及临床价值.方法:用TOPCON TRC-50EX眼底荧光造影仪对74例AMD疑诊患者进行FFA检查.结果:在79例中,确诊AMD74例,136眼,其中萎缩型114眼(83.82%),渗出型AMD22眼(16.17%),5例7眼排除.结论:眼底荧光造影和图像分析系统有助于早期确诊AMD,并发现AMD患者的CNV的位置,大小,性质,有助于指导治疗和评价预后.     

DSA图像质量保证技术

DSA是电子计算机与常规X线血管造影相结合的一种新的检查方法。作为一种实时图像采集和处理系统，其记录方式与传统血管造影方式有所不同，其存储于硬盘、磁带、光盘的数字减影图像可随时通过检索重现，经系统处理可获得多种影像学诊断和治疗疾病的图像信息，图像信息质量的优劣直接关系诊疗效果。本文从医学影像技术学角度出发，通过对科室数字减影血管造影图像质量分析及各项技术要素优化总结，就DSA图像质量及相关技术做如下浅析。     

输出查找表算法在DSA中的应用

目前少见到关于输出查找表算法在数字减影血管造影术中应用的报道。本文将输出查找表算法应用于数字减影血管造影术中,探讨不同输出查找表算法对数字减影血管造影图像的影响。研究表明：不同的输出查找表算法会得到不同效果的数字减影血管造影图像,使用分段幂函数或分段指数函数可以得到比较理想的减影图像。     

Evaluation of digital skin images submitted by patients who received practical training or an online tutorial

We evaluated the ability of subjects to capture and submit teledermatology images with a digital camera. We also examined whether participants who received individual training sessions would capture better-quality images than participants who were provided only with self-training. Fifty participants were randomized between in-person training and self-training via an online tutorial. The majority of participants were young, well educated women. Two dermatologists reading the images for quality indicators had high agreement that digital images acquired were of high quality: images were well framed, appropriately bright, in focus and did not have a shadow. There was moderate agreement on diagnosis-related indicators, such as the presence or absence of pustules or papules and acne versus rosacea. There was no difference in the image-quality attributes between participants personally trained and those trained with the online tutorial. Subjects participating in this study were able to acquire images of good quality, irrespective of whether they received practical training or used an online tutorial.     

眼底血管荧光造影机改造为数码眼底血管造影系统

在原有的RC-310眼底血管造影机基础上购置一套数字化摄像系统,将原来配备的普通光学相机改造成数字化成像影机及打印系统。该系统可以立即获得成像结果,病人可以马上拿到图文并茂的彩色检查报告,同时可长期保存清晰的数字化图像。     

眼底血管荧光造影机改造为数码眼底血管造影系统

在原有的RC-310眼底血管造影机基础上购置一套数字化摄像系统，将原来配备的普通光学相机改造成数字化成像影机及打印系统。该系统可以立即获得成像结果，病人可以马上拿到图文并茂的彩色检查报告，同时可长期保存清晰的数字化图像。     

倍频Nd：YAG（532）激光治疗糖尿病性视网膜病变83例的护理报告

目的总结应用倍频Nd：YAG（532）激光治疗糖尿病性视网膜病变83例的护理体验。方法根据眼底血管荧光造影,应用倍频Nd：YAG（532）激光治疗83例（137眼）糖尿病性视网膜病变患者,配合医生做好诊断时的眼底血管荧光造影检查、术前的心理护理和术前准备、以及术后的宣教回访等护理工作。结果83例（137眼）糖尿病性视网膜病变患者的光凝有效率达89．7％。结论对糖尿病性视网膜病变患者及时进行激光光凝术,配合全面、细致、周到的护理,可使绝大部分患者避免失明,提高其生活质量。     

Picture archiving and fundus imaging in a glaucoma clinic

Ophthalmological image archiving and distribution can be automated using a picture archiving and communication system (PACS). A fundus PACS has been in clinical use since February 2000 at the ophthalmology clinic of Tampere University Hospital. It consists of a digital fundus camera, an imaging workstation, from which new patients can be added to the archive, 10 viewing stations and an image archive server. In glaucoma imaging, the fundus images taken from a patient are transferred from the imaging workstation to the image archive server and are then immediately available from the physician's viewing workstation; the transfer time of an average image, of 350 kbit, is 0.0035 s, even though the archive is located 5 km away. After 18 months of operation there were over 16,000 images archived; these took 5.3 GByte of a total storage capacity of 41.9 GByte. The network and archive server achieved 99% reliability in use. Digital imaging makes it possible to shift ophthalmology clinics towards more patient-oriented treatment procedures.     

Quantitative Light Fluorescense (QLF) and Polarized White Light (PWL) assessments of dental fluorosis in an epidemiological setting

ABSTRACT: BACKGROUND: To determine if a novel dual camera imaging system employing both polarized white light (PWL) and quantitative light induced fluorescence imaging (QLF) is appropriate for measuring enamel fluorosis in an epidemiological setting. The use of remote and objective scoring systems is of importance in fluorosis assessments due to the potential risk of examiner bias. METHODS: Subjects were recruited from a panel previously characterized for fluorosis and caries to ensure a range of fluorosis presentation. A total of 164 children, aged 11 years (+/-1.3) participated following consent. Each child was examined using the novel imaging system, a traditional digital SLR camera, and clinically examined using the Dean's and Thylstrup and Fejerskov (TF) Indices. Polarized white light and SLR images were scored for both Dean's and TF indices and fluorescence images were automatically scored using software. RESULTS: Data from 164 children were available with a good distribution of fluorosis severity. The automated software analysis of QLF images demonstrated significant correlations with the clinical examinations for both Dean's and TF index. Agreement (measured by weighted Kappa's) between examiners scoring clinically, from polarized photographs and from SLR images ranged from 0.56 to 0.92. CONCLUSIONS: The study suggests that the use of a digital imaging system to capture images for either automated software analysis, or remote assessment by human readers is appropriate for epidemiological work. The use of recorded images enables study archiving, assessment by multiple examiners, remote assessment and objectivity due to the blinding of subject status.     

老年肝病患者DSA减影经验总结

目的:通过分析老年肝病患者减影失败或影像较差的图像,找出原因。方法:使用GE公司的Innova 4100数字血管造影机,Mark V ProVis 60/150高压注射器。回顾性分析40例数字减影血管造影图像。结果:优质图像占80%,良好的图像占15%,需要再次减影的占5%。结论:通过设定合适的造影剂注射速度、浓度、总量及注射压力等参数,并要求患者给予良好的配合,来获得优良的图像。