Picture Archiving and Communication System PACS
Posted by China Sourcing CommentatorJun 20
Image Archiving and Communication System PACS
I. Introduction
rapid administration of medical imaging information is one of the biggest challenges in medicine today. Patients with complex medical problems, a large number of radiological examinations can be conducted in areas physically separated, resulting in the existing studies inadvertently duplicated. Simultaneous access to radiological images may be needed for exact interpretation. In addition, multiple sentences for a patient, doctors want to check images. As medical centers increase in size, disease increased complexity and demand for a rapid transfer of information increases accordingly, the ability of systems based on X-ray films to meet these requirements down. The films are often unavailable or lost, and storage costs of the films are relatively high. The system is designed to store images in computers and has been developed on high resolution screens in the 10-12 years. The Picture Archiving and Communication System (PACS) to test the limits of film-based storage systems easily economic gains and rapid recovery of individual images, access images from multiple modalities, and simultaneous access same image to multiple pages to be overcome. However, acceptance of this new technology because of high capital costs, limited spatial resolution screens, limited spatial resolution of the scanning procedure for radiographic projection, slow play (compared to film-based systems) limited and the need for a system-backup redundancy cases represent a failure of a component. Most PACS are prototypes currently in use are intended for research purposes, although lately some have taken place in major segments
radiology PACS are computers or networks dedicated to storage, retrieval, distribution and presentation of images. Medical images are stored in an independent format. The most common format for image storage is DICOM (Digital Imaging and Communications in Medicine). Most PACS handle images from various medical imaging instruments, including ultrasound (U.S.), magnetic resonance imaging (MRI), positron emission tomography (PET), computed tomography (CT), endoscopy (ENDO ), mammography (MAMMO), Digital Radiography (DR), computed radiography (CR), etc.
Picture Archiving and Communication System II
The principles of PACS were initially in meetings of radiologists in 1982 discussed. Various people are credited with the invention of the term PACS. Cardiovascular radiologist Dr Andre-Duerinckx reported in 1983 that he first used the term in 1981. Dr Samuel Dwyer, however, credits Dr Judith M. Prewitt for the introduction of the concept. Dr Harold Glass, a medical physicist working in London in the 1990s the British government obtained funding and manages the project for many years to transform the Hammersmith Hospital in London as the first filmless hospital in the UK. Dr. Glass died a few months after the project came to life, but one of the pioneers of the PACS organizational skills to function effectively, smaller departments often can not be larger than the departments credited. Just take off with the recent development in imaging technology, the ability of film-based systems to meet the growing needs of radiology services. PACS electronic experience, cost-effective storage, rapid retrieval of images acquired, access to images with multiple modalities, and was developed to provide simultaneous access to multiply websites. Entry of a PACS can come from digital and analog sources (if they are scanned). PACS consists primarily of a recording device (an electronic gateway to the system), data management system (a special computer system that controls the flow of information across the network), the storage devices images (both short and long term archive) transmission system (which serves locally on large areas), produce display stations (including a computer, monitor, text, screen monitors and user interface) and equipment from images (currently a multi-format, or laser-camera). The objectives of PACS are to improve operational efficiency while maintaining or improving diagnostic capabilities. A. Modules Image Acquisition
recording device is an electronic portal images to PACS and can be an analog to digital converter or a device that runs on digital information from a device for processing digital image. The number of acquisition modules, changes to work with a PACS system and is based on its size and composition of input devices and digital.
data management system is a specialized computer that the storage of images
network, and image acquisition devices inspections to ensure an orderly traffic system to get. This computer manages the patient data and images and associated reports. The system of data management in the short and long term archiving capabilities. Usually uses the term magnetic storage media, and the long-term archiving uses optical media. Anchive the short term has a low capacity, but is often used (ie, high utilization), while the long-term archiving has a high capacity and low utilization. C. Transmission Network
data for images, text and system commands via networks, local area or wide to be transferred. The network could be the middle of a twisted wire pain, coaxial cables are connected to fibenoptic. A variety of network topologies (eg star) are available, each with its own advantages and disadvantages. In addition, several communication protocols have been
(eg Transmission Control Protocol / Internet Protocol [TCP / IP]) exist for the management of information in the network. These logs contain instructions on how data is moved over the network. D. Image viewing station
image display stations are the most important interface zone with doctors from a PACS. A base station includes a computer with local stunage to monitor a text, a variable number of video monitors and a user interface. A base station that can reproduce the entire spectrum of tasks, the speed of the display and the spatial resolution of film systems not yet built. In fact, the cost of creating such a station
would be enormous. To minimize the potential cost of the studies were conducted to determine the spatial resolution and contrast necessary to have a minimum range of imaging tasks. This information can then be used to generate a series of workstations with different levels of complexity, so that appropriate equipment is selected for the task. E. Hard-copy devices
Although the primary mode of storage and display with a PACS is an electronic system, the provision for the creation of a conventional x-rays at the age of film to be made. Multi-format cameras, laser cameras are currently the most common way to meet this demand.
interfaces with other systems F.
to function correctly, the system of image management, management interface with patients from other health care systems. This includes but is not a radiology information system (Ill.) and a hospital information system (HIS) is limited. The objectives of connecting to a RIS PACS and HIS in order to preserve the integrity of the global system and the performance of each system components using only the data needed to optimize each phone. The 1115 offers basic medical history, results reporting and data collection for the Department of Administration. The SA manages the demographic patient care standards and distributes information on the medical center.
I opted for the X-ray image retrieval system and communication for coronary heart disease (CCU) in a teaching hospital of 700 beds, as an example in my project for the PACS. The main components of the module are in the PACS radiology department and shared with PACS radiology of the child. An important objective of the design was to create a system in which the acquisition, routing and management of image data of the patient with minimal operator intervention are achieved creates. Automatic registration of images linking a computed radiography (CR) unit, RCF-1 reached 01 (Fuji Photo Film, Kanagawa, Japan) to an external host, VAX-i i / mini 750 (Digital Equipment Corporation , Maynard, MA.) These two components are integrated via an interface unit, which was developed internally. The host computer is used to manage the processing and transfer of data from creation, storage and archiving will be displayed.
Under normal conditions, is the only operation manual data entry and management of the database required to enter the patient name, hospital identification (ID) and the hospital section of the code CR console. This task is performed by a radiology technologist at the time of the imaging plate is performed. Once this is completed, the rest of the process is fully automated. The software that resides on the host computer detects the incoming imaging plate and initiate data transfer unit CR. Hospital section of code is used to rotate the image, a corresponding database (in this case, the database CCU). Data from the raw image with resolution 2048 x 2048 x 8 bits stored in the file structure standard image for PACS and archived set
reformatted. Then, the image file is subsampled to 51 x 51 2 x 2 8-bit resolution for the display and the patient list is updated to extend the new entry. Active patient images are stored on magnetic disk for quick access. Forty-five megabytes of hard drive space was allocated to the base of CCU, the maximum of 180 images online offers. Images are automatically archived for a unit of optical disk library FileNet in Costa Mesa, California) and Hitachi (Tokyo, Japan) was prepared. If a patient is on the user terminal is selected in the CCU, the image files are loaded onto a Gould 1P8500 image processor (Fremont, CA) and transfer video signals in real time to the CCU via a broadband network. Three channels with Blonder Tongue-video-modulators (Oldbridge, NJ), multiplexed with the bandwidth of 8 MHz. The viewing station in the CCU is composed of three 13-in. (30 cm) diagonally, 5i displays 2-line (Panasonic Industrial Company, Secaucus, NJ) and VT-00-I terminal for the user interface. A. User Interface
The user interacts with the system via a keyboard terminal VT I 00. A list of patients and various image processing functions in a menu format provided. In a typical distance, the first session the doctor selects a patient from the alphabetical list of assets and patients. The terminal prompts the user to wait while the database is searched. The pictures are shown on three screens in reverse chronological order, starting with the last recorded image (Fig. 2). The information appears at the bottom of the screen the patient’s name and hospital identification number and the date and time of recording images contain. At this point, the viewer can return to the list, more pictures of the patient during, or turn a function of image-editing program. The editing features include image zoom (pixel replication), medium and windows, reversing the rotation of gray, left-right reversal, and the image. B. Databases
databases using Indexed Sequential Access Method (ISAM) files. Most of the database contains patient information such as patient name, identification number of hospital, the number of images acquired to date, and the code of the image, which issued automatically if the patient has entered the database for the first time. The code of the image also serves as the primary key for the recording of image-based links that information with each image file bids, including the date of acquisition procedures, the current position of image (magnetic disk, optical disk, or both) and the volume and the physical address of the archive to optical disc. The images are from the magnetic disk according to a probability algorithm, the images should be checked at least cleared determined.
patients return is the last image to be recovered.
From the library of optical discs for comparison.
C clinical surgery UCC is one of the largest intensive care units in hospitals. It is five floors above and 1000 feet (300 m) of the Department of Radiology is located. This unit has held an average daily occupancy rate of 25.9 patients, and the average length of stay in the unit is 4.4 days. While in the CCU, 72% of patients had at least one chest radiograph. On average, 10 breast exams are performed each day, about half of them with a mobile unit. As the use of the mobile device is often a sign of the critical condition of the patient, a protocol created these images (about five inspections per day) from now to make way for CCU physicians throughout the system digital display. Traditionally, for watching movies, the doctor has the radiology department would be to check the patient’s film jacket, a procedure that is quite long. After a month of long-term clinical trial, the system was released for medical CCU for their use. The system may at any time was available, and doctors between the film and advertising system to choose the digital display. The decision on the system for clinical use, without restriction of press release was prepared under the premise that the functionality of a computer system must be defined and evaluated in the context of the normal task. The use and system performance were recorded in a file (1) verifies the name and identification number of hospital patients, (2) the date and time of visits, (3) the function image processing used (s) that provide (4) the identification of image manipulation, and (5) the speed of various operations. DICOM IV
DICOM stands for Digital Imaging and Communications in Medicine. His standard was developed by the National Electrical Manufacturers Association (NEMA) was established to assist in the distribution and viewing of medical images such as CT, MRI and ultrasound. Part 10 of the standard describes a file format for the distribution of images. This format is an extension of the old standard NEMA. Most people refer to image files that are compliant with Part 10 of the DICOM standard as DICOM format files. A single DICOM file contains both a header (which stores information about the patient’s name, the type of scan, image dimensions, etc.) and all the image data (containing information in three dimensions). This differs from the popular Analyze format, which stores the image data (*. img) to a file and the header data in another file (*. hdr). Another difference between DICOM and Analyze the data must be DICOM images can be compressed (encapsulated) to reduce the size of the image. Files can be compressed using variants with or without loss of JPEG format and a lossless encoding Run-Length (which is identical to the compression packed bits found in some TIFF-format images). be A.
DICOM header The following image shows a hypothetical DICOM image file. In this example, the first 794 bytes of a header in DICOM format, which describes the image dimensions and retains other text information used for scanning. The size of this header varies depending on the amount of header information is stored. This defines the header is an image that the dimensions 109x91x2 voxels, with a resolution of 1 data byte per voxel (so the size of the entire image will be 19,838). The image data follows the header (the head and the image data are stored in the same file). In addition, the DICOM header is displayed. The DICOM requires a 128-byte preamble (these 128 bytes are usually all set to zero), followed by the letter “D”, “I”, “C”, “M”. This is followed by the header, which conducted in groups, will be. For example, the group is the group 0002hex information on the meta file, and (in the example on the left) contains 3 elements. If we define the length of the group, stores the file version and the third stores the transfer syntax
DICOM elements required depends on the type of file. For example, the mode of image, “MR” (see Group: 0008:0060 element), so it should be elements that describe the MRI echo time. The absence of this information in this image is a violation of the DICOM standard. In practice, most DICOM format viewers (including MRIcro and ezDICOM) does not check for most of these elements, extracting only the header information that describes the size of the image.
NEMA DICOM preceded, and the structure is very similar, with many of the same elements. The main difference is that the NEMA format does not have 128-byte data offset buffer or DMTC the main characters. ” In addition, NEMA is not explicitly multi-image (3D), then the element is not present 0028.0008
was of particular importance is the group:. Element 0002:0010. This defines the “transfer syntax unique identification.” This value specifies the structure of image data, revealing whether the data has been compressed. Note that many DICOM viewers can only uncompressed raw data. DICOM images can be both by the common system lossy JPEG compression (which are high-frequency information lost) and a system for lossless JPEG, the new is rarely outside of medical imaging (which is the original and rare Huffman lossless JPEG, uncompressed and efficient JPEG-LS algorithm). Note that the coverage of the syntax of the compression technique (if any), transfer to the UID also reports the byte order for raw data. Different computers store integer values ??differently, so-called “Big Endian” and “little endian” order. Consider a 16-bit integer with a value of 257: the most significant byte stores the value 01 (= 255), while the least significant byte stores the value 02 Some computers would save this value as 01.02 while others see it as saving 02.01. Therefore, for data that is more than 8-bits per sample, a DICOM viewer, the order of bytes of data are exchanged in the order used by your computer.
In addition to the transfer syntax UID, will adjust the image specified by the samples per pixel (0028:0002), Photometric Interpretation (0028:0004), the bits allocated (0028:0100). For most MRI and CT images, the photometric interpretation is a continuous monochrome (eg typically depicted with pixels in grayscale). In DICOM, these monochrome images, a photometric interpretation of “monochrome1″ (low values ??= bright, high values ??= dim) or ‘MONOCHROME2 “are (low values ??= dark, high values ??= bright) was added. However, ultrasound images of numerous medical and color photographs and it is supported by photometric interpretations (palette, for example, RGB, CMYK, YBR, etc) described. Some color images (eg RGB) store 3 samples per pixel ( one for red, green and blue), while. store to store images in monochrome and pallets usually only one sample each of the images images 8-bit (256 steps) or 16-bits per sample (65,535 levels ), though some scanners save data in 12-bit or 32 – bit resolution can be described. Thus, an RGB image that stores three samples per pixel at 8-bits per potentially 16 million colors “(diced 256).
ezDICOM B. The ezDICOM is software that is easy to use, mature (stable, even if only a few bugs) and a wide range of medical images, including proprietary formats and DICOM images can see. For example, addition, most DICOM viewers can only read free a small subset of the DICOM images are available, while ezDICOM can see a wide range of images. In addition to DICOM images, the software will automatically detect and display the Analyze, GE (LX, Genesis), the Inter-File, Siemens (Magnetom, Somatom) and NEMA images. The greatest strength is ezDICOM it is free and open source. He is a lot of variations Medical image ‘in the wild’ – a lot of them are poorly documented or poorly. By free ezDICOM has developed a wide base of user, ensuring the quality of the code. Thousands people have used and sent in pictures ezDICOM unusual and rare, and the code is now mature and able to read almost every major medical images. Thus, the user of the most important force of this software. It is important to recognize the many people who shared their images with the developers. The advantage of open source is that programmers can modify and improve the code if they want. The project was launched by Wolfgang Krug and Chris Rorden has been extended and maintained. The development was led by Earl F. Glynn ‘s helped Tutorials Programming General David Clunie and Medical Imaging FAQ. This software is provided by the BSD open source license. You can distribute the two projects and compile the source code. However, you must also distribute the license (self-compiled program makes this easy: The license is installed in the “about” window). The license also notes that the software is provided “as is”, use at your own risk. This software tries to faithfully reproduce medical images. It is not designed for clinical use: computer monitors can vary widely in image quality. Are all grayscale images in 256 gray levels shown.
self ezDICOM for Windows program is a simple but very useful for viewing medical images. This software works on computers with Windows 95 or higher and requires less than 300 KB of memory. To show an image, simply drag and drop the image on the Program (or you can select “Open …” from the “File” menu). ezDICOM Despite the simplicity has a number of powerful features. For example, you can adjust the brightness and contrast of an image with high accuracy. You can animate images, the number of segments (see, for example, a heart beats in time to see or at different depths in the brain) have. L standalone application ezDICOM [version 1, version 19] is free software and is distributed as a compressed ZIP file – simply unzip the file and double-click ezDICOM.exe. Delphi source code is also included, and a personal edition of this compiler is available. D. DCM 2JPG
DCM2JPG console application is a simple command line Windows program. If you drop a file on the program, it is a JPEG version of the image (if not, whether the program is “dcm2png.exe” or the “dcm2bmp.exe ‘to create images in PNG or BMP). You can (most grayscale DICOM images have a much higher precision than the standard bitmap format stored) and the program of the command line, make special functions such as changing the brightness and contrast. Another nice feature is the ability to create beautiful enlarged versions of ‘DICOM images – such as saving an image of 128×128 pixels 192×192 pixel bitmap (scaling is done using a bilinear interpolation method to reduce jagged edges). Both a compiled program and source code (ezDICOM-based) can be downloaded from the Internet. The program has several command as follows:
? brightness b [center of the window]: A, H, -9999 .. 9999 for self, headers personalized default: auto
? Contrast c [window size]: A, H, 0 .. 9999 for self, headers, custom default: auto-f
? Format Output: B, P, J, txtfor bmp, png, jpg, txt, default directory
? jpg-o output, for example ‘C: temp “B. default source directory
? -s [no error reported] Silent: y for yes or no, default: none
? Z-14 Zoom of output, eg”1 0.5”for the Standard to zoom 150%: 1.0
V. Conclusion This report gave a brief description of Picture Archiving and Communication System CAP. It explains the components to install and how it works through an example of a radiology image archiving system and a communication intensive care unit. It also shows the format of the file extension of the image of the CAP and how it is displayed in the software ezDICOM. However, the output format of ezDICOM can easily be converted to another format like jpg to meet the requirements of a software called DCM2JPG simple console application. It is really interesting in this life, to see how science affects people’s lives.
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