高速大容量数据通道在数字成像系统中的应用研究

【作者】 黄建科；

【导师】 彭楚武； 李金宝；

【作者基本信息】 湖南大学 ， 控制工程， 2003， 硕士

【摘要】 X线摄像技术与数字化的结合，摆脱了常规的胶片式存储与管理模式，作为一种新型的X线成像方式，广泛地应用于临床。由于技术和经济条件的限制，国内X线成像的数字化一直未能大规模顺利实施。目前，国内最具挑战性的是X线实时高分辨率成像装置的研制，要实现高分辨率医学图像的获取、显示、存贮、传送和管理必须具有高速大容量的数据通道进行数据传输。因此研究和设计高速大容量的数据通道是具有积极意义的。 本文首先对数字减影血管造影(DSA)成像系统的组成结构和数据流向进行了深入研究和分析，并对系统中的数据流向进行了完整的归纳和总结，给出了X线数字成像系统中的高速大容量数据通道的设计方案；在对SDRAM的控制方式做了深入探讨后，给出了实现大容量多条SDRAM共同工作的解决方案，在此基础上设计了大容量帧存板实现对图象数据进行高速存储；通过对PCI总线接口的深入研究，优化后端状态机设计和低层驱动程序开发，给出了完整的PCI接口方案实现高速DMA数据传输，完全可以满足视频传输要求；深入研究了基于大规模可编程器件的数字系统设计方法，针对通用FIFO使能信号漂移、输出数据难于建立和保持等设计难点，提出了利用FPGA中的锁相环提供多个时钟相移的信号来提高系统稳定性的解决方案，从而实现利用FIFO来协调系统各模块之间的数据高速传输。 上述成果在实际数字成像系统中的成功应用，表明了本文研发结果的有效性与实用性。更多还原

【Abstract】 As a creative X-ray imaging mechanism, the X-ray photograph and digitalizing technology has been widely used in medical treatment because of its non-physical film storage. For reasons of the economical and technical limitation, the digitization of X-ray imaging has not been widely used in our country. It is a real challenge that real-time high resolving power formation of image device of X-ray is made at home, which should include the fetching, displaying, storing, conveying and management of images in high resolving power. It is very important that data channel with high speed and large capacity carry on data transmission in this device. As a result, researching on the data channel wiht high speed and large capacity will contribute to the area of medical imaging systems.Further investigated and analyzed composition structure and flow data that DSA’s formation of image is systematic at first in this paper, carried on intact summing up to the data in the system, Having given out the plan of design of high speed and large capacity data channel of digital formation of image system of X-ray; Deeper discussion of control way on SDRAM, give solution that many pieces of SDRAM works togetherses of realizing heavy capacity, Designing of heavy capacity deposit board realize storing at a high speed to vision data by frame on the basis of this; Through further investigations of interface of PCI Bus, Optimize back end state machine design and urge procedure making with lower ,Giving intact PCI interface scheme that realize high speed DMA data transmission and satisfy request of video transmitting; Further investigate the figure systematic design method of programmable logic devices,Due to the difficult point of drifting about of enabled signal in FIFO in common use and setting up and keeping of output signal,method has been proposed of improving stability of system making use of signal utilizing the phase locking ring in FPGA to offer a lot of clocks to move thus realize coordinating the data between every module of system to transmit at a high speed by making use of FIFO.Successful application of the above achievements among system of digital formation of image indicate the efficacy and utility of the result studied and explored in this paper.更多还原