构建DICOM中间件实现远程医学影像信息的异地共享

针对目前医院信息化建设中急待解决的影像信息共享的问题,围绕医学图像的国际标准DICOM这一技术核心,提出并构建一种基于DICOM标准的中间件软件,成功实现多家医院PACS间医学影像信息的远程存储和远程通讯,有效地解决不同PACS之间医学图像数据的兼容性问题,满足传输过程中的安全性和可靠性的要求,从而达到了多家医院PACS系统之间医学影像资源异地共享的目的.     

数字化医院的网络安全问题及对策探究

数字化管理和一流的医疗设备是医院现代化的两个主要组成部分,通过计算机网络,PACS系统实现了各类医疗图像信息的集中管理和共享,HIS系统则把医院的事务管理和医疗业务进行信息化管理,计算机网络和数字化管理在医院中的作用显得日益重要。为加强网络管理,保障数字化、信息化管理的安全,本文在分析医院信息网络安全所面临问题的基础上,探讨了解决计算机病毒、信息系统崩溃、数据遗失等问题的措施。     

基于影像编码和传输技术的PACS

PACS在医疗诊断和治疗过程中占有非常重要的地位,其重要性已被人们所认识。在我国由于PACS中若干关键技术没有得到解决,共发展仍然处于起步阶段,本介绍了一个基于无损压缩和影像传输技术的PACS,对其设计中的总体结构、存储策略、涉及到的国际标准进行了描述,并重点介绍了基于医学影像特征的无损压缩方法,以及基于TCP／IP协议的影像传输方法。实际系统的运行结果表明,系统的设计是合理的,压缩算法针对于医学影像有较好的压缩效果,同时传输方法可以很好地支持医学影像服务器和医生工作站之间点对多点的通信。     

基于云PACS系统的DICOM协议安全通信框架

传统的PACS系统存储和维护海量医疗影像数据成本高昂,且经由DICOM协议传输的影像数据容易遭到黑客攻击,造成数据被非法篡取、病人隐私泄露等数据安全性问题。提出一种PACS云服务模型以满足数据存储、维护、安全传输等需求。设计的统一身份认证框架采用基于USB Key强身份认证方案和基于SSL通用身份认证方案两种混合验证模式,经过安全性分析表明,此框架能够保证数据的秘密性、认证性和完整性,并能抵御常见的中间人攻击、重放攻击和字典攻击,有效确保云PACS系统中DICOM协议安全通信。     

PACS设计与实现中的几个关键问题

医学图像归档及通信系统（PACS）的设计与实现是医学图像处理领域的研究热点,同时对医院构建放射学信息系统、医院信息系统有着重要意义。结合开发图像归档服务器的经验,分析和探讨了PACS设计和实现中的几个关键问题,比如PACS的功能选择、PACS底层通信协议的选择、数据库的管理、图像存储媒体的选择、图像诊断工作站的选择、支持远程医疗的WEB数据发布策略等等。最后,阐述了一个新构建的小型PACS的机构和主要技术。     

一种新型PACS系统存储方案设计

在PACS系统存储应用特征分析的基础上,提出对医学图像实施多层存储的思想,并具体设计了医学图像高速存储中数据替换的方法。     

基于无线局域网络技术的PACS系统

随着人们对医疗系统准确性、及时性、方便性要求的不断提高,医疗数据与图象的处理、存档及传输等技术成为大量的医疗系统人员近年来研究的热点。DICOM标准的出现又进一步大大推进了这一领域的研究。该文分析了目前我国医疗处理及传输技术的现状,提出了一种基于无线局域网的PACS解决方案,对该系统的体系结构和关键技术进行了剖析,并分析了它在未来医疗系统发展中的重要作用。     

基于DCMTK的医学影像工作站设计

随着可视化技术的发展,现代医学已越来越离不开医学影像信息。作为PACS系统的重要子系统的医学影像工作站近几年具有突破性的发展和广泛性的应用,使影像诊断活动从过去经验主导模式逐渐向更加科学、精确的数字化模式转变。本研究利用VC＋＋和DCMTK3.5.4开发了基于DICOM3.0的影像工作站系统。主要介绍了DCMTK的下载、编译、调用其静态库的方法及系统的功能设计和编写过程。系统能实现对DICOM图像文件的显示、编辑、传输、存储、图文报告编辑与常用格式图像的转换,并支持C-STORE、C-MOVE、C-GET、C-FIND等服务。     

实现医学影象存档和传输系统中的若干关键技术

ＰＡＣＳ的重要性已被人们所认识,并且其技术在近１５ａ中得到了迅速发展。但是,实现ＰＡＣＳ仍然还有很多问题有待于解决。该文通过大量有关文献研究,指出并分析了实现ＰＡＣＳ过程中涉及到的关键技术,特别是对国际医学影象通信标准的内容进行了介绍;讨论了系统中有关影象存档和处理显示功能的软件设计方法;分析了常用的大容量影象数据存储方式,并给出了国内目前可行的解决方案。最后指出,为了跟上国际医学信息技术的发展潮     

Planning for PACS at Osaka University Hospital.

We have a plan to adopt PACS as a medical image information system in the new hospital. In order to construct PACS suitable for our hospital, a preliminary survey was carried out to determine how PACS should be introduced and what are the physicians requirements for a new medical image system. The most important requirement of the physicians was a good quality workstation. Our plan of a new medical image information system is as follows. A primary database will be constructed according to each of modalities in the Department of Radiology. In the Department of Medical Information Science, we will make a secondary database according to the patient. Although it may be difficult for us to obtain a sufficient budget digitalizing all medical images by our move to the new hospital, our goal is to establish total PACS throughout the new hospital in 1995.     

基于DICOM的数据组织及医学图像序列提取方法研究

DICOM标准是应用在PACS系统中的一个医学数字成像和通信的国际标准,文章在深入研究DICOM标准的基础上,结合在实际中开发PACS系统的相关经验,对基于DICOM的数据组织层次进行了较为深入的分析,给出了提取DICOM文件中相关属性信息并解析分离图像数据信息的一般方法,最终提取出基于DICOM标准的医学图像序列。     

Clinical application of a magneto-optical disk image filing system/image save and carry (ISAC) system.

We propose the utilization of portable magneto optical disks for image filing. The main problems in PACS are the need for a high-speed local area network (LAN) and a large mass storage device. An image filing system--image save and carry (ISAC)--is one solution for these problems in present PACS and requires minimal additional hardware and cost for the installation. Whenever a patient is examined, the clerk carries the medical record and the ISAC magneto-optical disk for recording image data, and after inspection records the image data into the magneto-optical disk. We investigated the number of image retrievals done for inpatients and outpatients in 1988 at our radiation therapy department. The data storage requirements were on the average 18.5 MB for outpatients and 173.9 MB for inpatients. An ISAC display console needs also an easy-to-use man/machine interface for specifying images and image display characteristics in order to realize the ISAC system.     

User and manufacturer's requirements for IMAC standardization in Japan.

Many radiologists and radiological technologists understand that Picture Archiving and Communication Systems (PACS) are useful not only for image management but also for improving the quality of patient care. However, such systems have not yet been widely installed in hospitals. In order to determine why radiologists have not installed a PACS in their hospitals, we carried out a written survey of 400 Japanese hospitals asking them to describe the current image management activities, the problems inherent in PACS and the problems related to standardization. 216 hospitals responded, and the following suggestions were compiled concerning possible improvements to PACS. (1) PACS benefit needs to be improved with respect to patient care. (2) The cost of PACS should be reduced. (3) The system should be easier to operate and should save time. (4) Standardization is needed to allow simplified, cost-effective networking. We also carried out a written survey of 25 PACS and related equipment manufacturers asking them to describe the opinions inherent in current PACs and the problems related to standardization. Ten manufacturers responded, and the various suggestions were compiled concerning possible improvements to the PAC system.     

PACS中的图象管理与预取技术的研究

介绍医学图象的分类,着重介绍解放军总医院在研制PACS系统中采用的医学图象管理和图象预取技术。     

基于混沌序列的脆弱数字水印算法

为解决Yeung-Mintzer脆弱水印算法的安全性问题,提出一种基于混沌序列的水印算法。采用混沌序列对Yeung-Mintzer脆弱水印算法进行改进,得到更好的水印不可见性和篡改检测率,同时保留原算法运算速度快、检测定位能力强、盲检测等优点。理论分析和实验结果证明,该算法可以应用于法律证据图像、医疗图像等安全性和图像质量要求高的领域,有效地检测对图像的篡改部分。     

基于VB和MATLAB的医学图像处理系统设计

探讨利用VB和MATLAB在医学图像处理领域混合编程的方法。通过ActiveX技术将VB和MATLAB混合编程实现图像处理,建立Windows环境下的图像处理系统。该系统可以对医学图像进行图像预处理和图像增强方面的操作,尤其在图像的灰度变换、消除噪声和边缘检测方面具有良好的效果。通过VB和MATLAB进行混合编程可以减少设计的时间,降低编程难度,同时兼顾了代码安全和界面友好,适合于开发一个在Windows工作环境下运行的、具有丰富的程序接口以及图像处理能力的应用软件,且大大提高了开发效率。     

DICOM数据集研究和DICOM图像处理软件的实现

针对DICOM3.0标准,详细分析了DICOM文件结构及DICOM数据集,给出了其中一些关键技术问题及相应的解决措施。最后基于VC.Net2003开发出一种DICOM医学图像处理软件,该软件能实现DICOM医学图像的显示、测量以及与通用图像格式转换等功能。     

PACS系统的存储技术研究与实现

介绍了PACS系统在医学影像领域的应用，分析了PACS系统对存储的需求，论述了不同存储技术实现机制和在PACS中的应用．并利用SAN，NAS，DAS几种不同的技术，设计并实施了医院的存储方案，突出在线存储为特点，利用虚拟化存储技术，实现大容量、高性能、高可靠性的医学影像存储．     

Digital watermarking: Applicability for developing trust in medical imaging workflows state of the art review

Medical images can be intentionally or unintentionally manipulated both within the secure medical system environment and outside, as images are viewed, extracted and transmitted. Many organisations have invested heavily in Picture Archiving and Communication Systems (PACS), which are intended to facilitate data security. However, it is common for images, and records, to be extracted from these for a wide range of accepted practices, such as external second opinion, transmission to another care provider, patient data request, etc. Therefore, confirming trust within medical imaging workflows has become essential. Digital watermarking has been recognised as a promising approach for ensuring the authenticity and integrity of medical images. Authenticity refers to the ability to identify the information origin and prove that the data relates to the right patient. Integrity means the capacity to ensure that the information has not been altered without authorisation.This paper presents a survey of medical images watermarking and offers an evident scene for concerned researchers by analysing the robustness and limitations of various existing approaches. This includes studying the security levels of medical images within PACS system, clarifying the requirements of medical images watermarking and defining the purposes of watermarking approaches when applied to medical images.     

Adaptive reversible watermarking for authentication and privacy protection of medical records

Multimedia Tools and Applications - Medical systems, such as PACS or scanners, are vulnerable to security and forgery attacks. Consequently, medical records, such as patient information and medical...