高速数据存储在CT成像系统中的应用研究

Study on High Speed Data Storage in CT Imaging System

计算机断层扫描系统(CT)是现代医学影像学中重要的临床诊断工具,它可以直接向医生提供患者组织和器官的生理及病理变化。现代CT的发展方向是更快的扫描时间和更好的图像质量,从而对数据存储系统提出了更高的要求。本文首先对比研究了目前数据存储系统的存在问题和解决速度瓶颈的可行性方案,提出了独立硬盘存储系统的设计思路。然后通过研究IDE硬盘的工作原理和模式,采用可编程控制器和VHDL实现高速数据存储系统设计。本文研究的高速数据存储系统,不通过计算机系统实现对数据的直接存储和读取,避免了对成像系统资源的占用。同时本高速数据存储系统具有可扩展性,可以满足未来系统发展对带宽的不断需要。通过实验验证,本文设计的高速数据存储系统实现了大容量数据的高速传输和存储,速度稳定达到160MB/s,通过扩展还可以进一步提高性能,完全满足了螺旋CT系统对数据存储功能和速度方面的要求。上述成果在实际CT系统中的成功试用,表明了本文研发结果的有效性与实用性。

Computed tomography （CT） is an important tool in modem medical imaging for clinical diagnosis. It can provide doctors with the physiological and pathological changes in tissues and organs of the patients. The development of CT is towards the direction of the faster scan time and better image quality, thus demand the data storage system to a higher level. The paper first make a comparative research on the data storage problems existing on the current DAS system and possible methods to solve the speed bottleneck, and prompt a new design method. Then through studying the working principle and transfer protocol of 1DE hard disk, the new design is fulfilled by using FPGA programmable chip and VHDL logic. The high speed data storage systems studied in this paper bypasses the computer system for storage and retrieval of data, and avoids occupying the resources of imaging system. In addition, the high speed data storage system is expandable to meet future system developments of the continuing need for bandwidth. Through the research and design, the high speed data storage system is capable of large-capacity high speed data storage with the data transfer rate of 160MB/s. It can also be expanded and further improve its performance, to meet the functional and speed requirements of future MSCT system. The results of field running on CT imaging system show the aim of the design is achieved.