The Study Of Digital X-ray Unit Data Stored And Communication

X-Radiography, based on photography and perspective, is always playing an important role in clinical diagnosis. With the progress of computer science and electron technology, Digital Radiography (DR) has oriented the new developing direction of X-Ray diagnosis technology since it had been introduced to clinic in 1980's and its effect on diagnosis evaluated ever since. DR is an electronic image acquisition system consisting of the sensor, a frame grabber in the computer and the software required to control the sensor and the do some basic manipulation. Advantages of DR are the immediate availability of the images, the lower radiation dose, the possibility of image enhancement, image reconstruction and computer aided image analysis, transmission of images by telephone, and storage of large numbers of images in image-databases. The developments of internet makes the digital X-Ray unit a hot research point in medical imaging technology, which uses the network to collect, deliver, save and communicate data. As well as digital medical equipments trends the development of medical diagnosis technology. Radiology Information System (RIS) and latterly, Picture Achieving and Communication Systems (PACS) are both digital technology. PACS, developed on the progress of digital imaging, computer and Internet technology, is an integrated system aimed for acquiring, displaying, storing, transferring and managing medical images. Supported by theadvanced image processing and communicated technology, PACS connects all medical imaging equipments into the hospital's network. So medical images gathered by these equipments can be captured, transferred and shared in the whole hospital, which makes the hospital daily work more efficient. Since digitalization of storage and transmission of medical images is the first step for telemedicine, PACS proved to be the base of telemedicine technology.Currently, the digital X-Ray units used in clinical laboratories in the hospitals of our country are mostly base on Charge Coupled Device (CCD) technology. A CCD system, including image-intensify equipment, CCD and A/D converter, works like that: the X-Ray is transformed to visible light through image intensify equipment, then to video signals by CCD. The video signals are turned into digital matrix-image by A/D converter and finally stored, transported and post-processed by computers.But how to make the digital X-Ray units, existed, to meet the piratical requests of PACS. First, the hospital should establish physical network. And then to chose a protocol for the PACS. The Digital Image Communication in Medicine (DICOM) 3.0 would be a No.l choice. The DICOM is a global accepted standard for communication of medical image between computers. Almost all the new medical equipments support the protocol. The good opening and extension features guarantee the success of PACS.In this thesis, the DICOM protocol implementation and application are discussed base on existed X-Ray units. This includes:1) Study and discussion on DICOM application entity's architecture and DICOM working mechanism. And a model of DICOM network communications was proposed.2) Based on the model, we discussed how to design and implement DICOM protocol, and developed a DICOM network library.3) With the use of this library, we described the development of the most important DICOM service class: storage service class.4) Realizing data stored and communication, according to the question of digital X-ray unit.