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Purpose and description of PACS graphic workstation system

2018-09-06

The PACS system is a comprehensive system that realizes the acquisition, storage, transmission and management of medical images through a computer network. It basically replaces the various complicated operations traditionally performed on image film. The system started abroad in the 1980s, matured in the early 1990s, and has been widely used in clinical practice.

I. Introduction The PACS system is divided into eight parts: real-time image acquisition, image analysis, image query, management, storage, graphic editing and printing, consultation center, remote consultation and system management. Among them, real-time image acquisition is the key. At present, foreign products basically use medical equipment or CR equipment based on the DICOM3 interface based on international standards in image acquisition. Most of the rest are analog signal equipment or camera equipment. Based on this situation, strive to make the existing equipment as much as possible online. Our PACS system formulates the following solutions: For digital non-destructive acquisition with DICOM3 interface: For analog equipment with non-DICOM3 interface, use analog video acquisition: For X-ray photographic equipment and foreign film, historical film, use scanned The method is collected, and these three methods are integrated into the whole system. This covers all medical imaging devices while effectively supporting DICOM3.

2. System plan

The system includes seven subsystems, as follows:

1. Image real-time acquisition subsystem

The system collects image information from various medical equipments into the computer. According to the system design, our hospital adopts three acquisition methods: digital (DICOM3, Ethernet), analog video and scanning. In the digital mode, the system realizes the function of real-time automatic acquisition without manual operation. The acquired images based on DICOM3 have no loss, and the display mode and operation mode of the images are also consistent with those in medical equipment. In the analog video acquisition mode, the video signal captured by the computer in real time is converted to convert the analog image of the medical equipment into a computer digital image in a unified format. In the scanning mode, we found that the application program of the scanner itself is not very suitable for the operation of medical images. Therefore, our hospital cooperated with Beijing Huayuan Technology Co., Ltd. to design a scanning application specifically for medical images, so that the scanning operation is completely embedded. The whole system does not need to be manually operated separately; for a film with multiple images, the image can be automatically cut by the computer; for the film whose size exceeds the scanner's width, it can be automatically spliced in the computer without creating gaps. This effectively reduces the workload of scanning operations.

2. Image Analysis and Processing Subsystem

This subsystem analyzes and processes the images collected by the computer (including three methods) as needed to help doctors diagnose. The functions include grayscale/contrast adjustment, window width/window level adjustment, single/multiple display, Zoom in/out, local zoom, quantitative measurement (CT value, length, angle and area of arbitrary curve, etc.), image scale measurement, image rotation, image printing and various image annotations, etc., among which window width/window level adjustment, CT value adjustment The measurement is exactly the same as the operation of the CT machine.

3. Image query, management and storage subsystem

This subsystem establishes database storage management for the medical images collected by the computer, so that both the radiology department and the clinical doctor can call the patient's diagnostic information and images at any time through the network, so as to provide better diagnosis for medical personnel at all levels. , Research work and study conditions. The system provides a variety of keywords for comprehensive retrieval of patient image information. Keywords include name, age, gender, examination number, clinic number, diagnosing doctor and visiting time, etc. The retrieval process and method are designed to be very flexible and easy for doctors to operate. In terms of storage, advanced lossless compression algorithms are used to compress storage in real time.

4. Graphic Editing and Printing Subsystem This system can help doctors to input patient information through a dictionary, such as name, age, gender, examination number, outpatient number, inpatient number, diagnostic engineer, visiting time and diagnosis result, etc. If the patient has undergone radiation therapy Section inspection (regardless of type) can be directly called out without re-entry; after data entry, a standard diagnostic report will be provided, with graphic and text editing, and output through a laser or color inkjet printer. In addition to diagnostic reports, the system can also help clinicians edit scientific research and teaching articles.

5. Digital images

Write-back subsystem This system can not only capture images from medical equipment, but also write back the image data in the computer to digital imaging equipment such as CT and MRI when needed for photography or further image post-processing. The write-back function is divided into two parts, and the effect is the same as when the original equipment is directly produced. The analog video and scanned images can also be written back after special processing by the program in this system, and the effect is ideal.

6. Consultation Center Subsystem

The system consists of high-brightness, high-definition collective display equipment, projectors and special scanning equipment. Its main function is to organically combine the data and images of various examinations according to the needs of diagnosis to help doctors conduct comparative analysis. It effectively breaks through the bottleneck that the previous PACS system cannot fully display diagnostic images and data due to insufficient display capability. Thus, the use effect of the PACS system in diagnosis is effectively improved.

7. Remote Consultation Subsystem

This system uses the hospital local area network and the external Internet network and telephone line as the communication medium to realize the transmission of original image data and other information of patients between hospitals, and can provide remote consultation services for patients conveniently, so that patients in different places can enjoy to a high-level expert diagnosis.

8. system management subsystem

3. Summary

The main body of the PACS system composed of these 8 subsystems can effectively improve the efficiency of medical images used by doctors at all levels, and is very helpful for the preoperative preparation of surgical patients, clinical diagnosis and doctors' scientific research and teaching; Under the premise of complying with medical regulations, the number of films produced can be gradually reduced, thereby reducing the labor and financial resources spent on film production and achieving better economic benefits; by using electronic archiving, there is no problem of film aging and loss of original information, The continuous operation of medical imaging has been improved and it will bring more benefits to the hospital.

Tel： 400-688-0628

Company address: F113, Guangzhou International Business Incubator, No. 3 Lanyue Road, Huangpu District, Guangzhou

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Tel： 400-688-0628

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