Hospital operating room teaching monitoring and medical imaging technology is relatively high, requires extremely high definition and color reproduction, high-fidelity two-way advancement, rich control functions and network transmission functions. Our company's accumulated experience and technical exploration in recent years have mastered computer multimedia control, microwave wireless and remote network transmission technologies. In order to improve the hospital's service ability, enhance the hospital's image and competitiveness, in today's rapid development of science and technology, large hospitals incorporate medical teaching into plans that take into account current and future development levels, which is an ideal and comprehensive solution. Method. Aiming at this assumption, we made an appropriate design plan according to the actual needs of the hospital and related design specifications, which fully reflects the advanced, scientific, reliable, and reasonable characteristics of the hospital medical video teaching system.
System design requirements:
The system consists of video and audio acquisition subsystem, broadcast subsystem, and department broadcast subsystem. The video and audio acquisition subsystem includes front-end cameras, pickups, and front-end digital video and audio acquisition machines. The broadcast control subsystem is controlled by the central control host. And video storage server; the department broadcast subsystem consists of medical video workstations, multimedia projectors, electric projection screens. The video and audio acquisition subsystem is set in each operating room; the broadcast control subsystem is set in the general control center; the department broadcast subsystem is set in its own demonstration department, so that the scene situation of the operating room we need to watch can be called in the demonstration department as needed. .
3. Design scheme system:
This design solution uses Xunfei video video teaching system, which is the most advanced video teaching solution using MPEG4 video and audio compression algorithm. Not only has it been used in hospitals in Shanghai, Beijing, Yunnan and other regions, but it has also passed expert identification.
Video visual education system is mainly composed of the following three parts:
1. Real-time acquisition subsystem;
2. Broadcast control subsystem;
3. The department broadcasts the subsystem.
The structure of the system is as follows:
3.1. Real-time acquisition subsystem
This subsystem can be divided into front-end acquisition equipment and acquisition workstations.
3.1.1 Video and audio front-end acquisition equipment <br /> For each operating room, two video inputs and one audio input are required. One of the video recording devices is designed as a fixed camera placed at the corner of the operating room. This camera should be able to clearly and comprehensively reflect and record the image information of the surgical process. The second channel video recording device is designed as a camera installed above the operating table. This camera should be able to clearly reflect and record the image information of the surgical details. It should cooperate with the installation of the shadowless lamp above the operating table, and try to use small and concealed equipment To reduce the impact on the decoration of the operating room. The choice of audio recording equipment is very critical, because we must consider the special environment of the operating room, which can not only interfere with the operating room equipment, but also have a good and stable pickup effect, and at the same time, it must be easy to use and maintain. In view of the above requirements, we choose a flat ceiling microphone for audio collection. This microphone has high sensitivity and weak directivity. It is particularly suitable for large-scale multi-source acquisition. It can be easily installed on the ceiling or shadowless lamp in the operating room;
At the same time, in order to ensure the real-time high-fidelity intercom function between the teaching room and the operating room, we choose a combination of amplifiers with good sound quality to achieve the sound reinforcement of the operating room (teaching room sound reinforcement equipment) Also choose this combination) to meet the system's requirements in terms of sound quality.
3.1.2 Audio and Video Collection Workstation
XF200X digital full real-time acquisition workstation is the product of the rapid development of high-tech computers and communications. It mainly uses the computer's large-capacity hard disk to retain large quantities of video data. During the design process, MPEG4, multicast, and multi-channel control are used. High-tech in the computer field, etc. At the same time, a number of technologies such as practical PTZ control, screen segmentation, and matrix switching have been added to form a true "multimedia integrated acquisition and transmission system". Compared with traditional analog systems and similar products, this system has the characteristics of real-time, multi-channel, integration, networking, compatibility, etc., it can realize matrix switching on a control host, multi-screen segmentation, simultaneous video and audio transmission, and digital real-time recording , Remote PTZ control and other functions.
3.2 Broadcast control subsystem <br /> A central control machine and a storage on-demand server are configured in the control center. Install Xunfei's "Multimedia Teaching Control System" on the central control machine to switch and control all images, and its monitoring range and authority can be set through the system software. This central control machine can realize the function of "online broadcast" through WWW service. Xunfei storage and on-demand software is installed on the storage on-demand server, which supports network storage, network on-demand, and rebroadcasting of any operating room surgical video and audio data;
3.3 Display classroom playback subsystem <br /> In each classroom, a teaching workstation, multimedia projector and electric projection screen are equipped.
The workstation can receive video and audio data from any operating room for real-time surgical viewing, surgical teaching and surgical intercom. At the same time, the operating room information can be automatically collected, and the video can be projected on the electric projection screen through a multimedia projector in a full screen manner.
3.4 System Expansion Ability:
3.4.1 System networking capability:
System networking capability is an important indicator to measure the pros and cons of a system design. This project design fully considers the system's networking capability, and strong networking capability is one of the advantages of the XF200x system.
With the gradual expansion of the system, each department may have its own live broadcast room and transmission system. Once these systems appear, they can be networked with the current system, so that video and audio and system information resources can be shared. The systems are connected through an IP network.
3.4.2 Expansion capacity of live broadcast room:
Through the selection and increase of the number of workstation models, the smooth expansion of the live room system can be achieved without restrictions.
3.5 system functions:
3.5.1 Medical Video Acquisition Workstation
- Audio and video collection: 2 real-time channels per host (with a total codec delay of less than 100 milliseconds and a total system delay of no more than 0.5 seconds). Synchronous video and audio collection, compression, storage, network transmission, and playback; 25 frames / second per channel , Standard resolution 352 × 288, maximum resolution 720 * 576; can be enlarged to full screen, local details can be enlarged without limitation;
- Super high compression ratio:
Adopt the industry's top compression technology MPEG-4 algorithm, the compression ratio is as high as 1: 500, each channel only needs 60 ~ 180M hard disk space (including video and audio); support CBR and VBR mode, CBR mode network transmission bandwidth 10K ~ 2M Adjustable, VBR mode can set the image loss ratio.
Four recording modes:
Manual recording, timing recording, alarm recording, motion detection recording;
- PTZ control:
Supports three variable control of lens aperture, zoom, and focus; supports all-round control of the PTZ; can be controlled at monitoring workstations and network sub-control terminals; supports multiple decoder protocols such as PELCO-D, AV2001, ABK2000, V1200 .
- Alarm management:
16 inputs, 8 outputs, free definition of linkage rules, alarm information storage, network transmission, query;
- Network sending:
Supports multi-user network monitoring, supports multicast, TCP, UDP data stream output, and can penetrate network layer agents.
- Safety management:
Important operations require permission password verification to prevent unrelated persons from viewing, deleting, and modifying image data; unauthorized persons cannot access remotely;
- Smart applications:
Start / stop timed recording and timed motion detection by time period; the image has motion detection function; compression ratio, image quality, and network bandwidth can be adjusted locally and remotely.
- Friendly interface:
Full Chinese graphical interface, simple and practical, easy to operate, no training required; B / S structure.
3.5.2 Medical Video Master Control Workstation
- real time monitoring:
Simultaneously receive audio and video data of any 16 monitoring points in the network and decode and display, which can realize multi-screen monitoring of 1, 4, 9, and 16 screens; you can group monitoring points to automatically patrol and monitor; monitoring stations and master control stations can It is one-to-one, one-to-many, many-to-one, and many-to-many remote control: PTZ and lens can be controlled by any authorized monitoring point.
- Support heterogeneous networks:
Supports various networks capable of carrying IP data (telecom network, Internet, data leased line, satellite, wireless), supports remote real-time monitoring across routers, remote retrieval and viewing of historical data, remote control; supports multicast function.
- Multiple display modes:
1, 4, 9, and 16 screen split multi-screen monitoring, which can be displayed on all channels or single channels, and can be connected to large screen projection or rear projection.
- Tree device management:
A tree structure is used to organize each monitoring point, which is easy to operate; it has good scalability and is not limited by the number of monitoring points.
- Centralized alarm processing:
The subordinate monitoring station automatically receives alarm information, and prompts the administrator with sound and light and mobile phone text messages.
- Remote configuration:
Perform remote parameter configuration, system restart, and other maintenance operations on subordinate monitoring stations.
- Condition monitoring:
Able to detect the online status of subordinate monitoring workstations in real time and dynamically detect the network bandwidth of the connected channel.
- Store manually:
Any number of audio and video data for real-time monitoring can be manually stored on the server.
3.5.3 Medical Video Storage Server <br /> The medical video storage server enables users to see any video signal in the operating room at any time and anywhere. The server also provides data-on-demand functions. Users can either directly request the stored files on the server or on-demand local files through the system's distributed query function. The server provides users with hierarchical authentication services to enable different levels of users to have different levels of control and monitoring. See the right, high-level users can preempt the control commands of low-level users.