Hardware Design And Implementation Of High Speed Pipelined Dht For Helical Cone-beam Ct 3d Reconstruction

With the emergence of multi-slice spiral CT (Computed Tomography),medical CT spiral cone-beam CT is changing. Spiral cone-beam scan with reconstruction images obtained with the scan speed, spatial resolution advantages, while it is complicated in theory and technology, especially in the speed of implementation has been a bottleneck, where Hilbert filtering and back projection are two steps constraining the real-time. This paper is an exploratory research of the Hilbert filter.As a part of the spiral cone-beam CT (CBCT) reconstruction of the FPGA hardware acceleration system, the discrete Hilbert transform implementation method of the exactly reconstruction algorithm Katsevich is studied and the high-speed pipelined hardware architecture is proposed. By exploring the background of this issue, the Fast Fourier transform method for high-speed hardware design is proposed and is successfully implemented on the FPGA platform.Three parts are contained in this paper as follows:First, the spiral cone-beam CT Katsevich algorithm key step in the imaging process is deeply studied, and the three Hilbert filter and its realization is deeply analysed and compared, and the method of selecting the discrete Fourier transform XiAlbert transformation reasons is described.Second, several Fast Fourier transform algorithm was compared, a pipelined architecture of Discretion Hilbert transform is proposed based on the Winograd algorithm and CORDIC algorithm, and specific method for in-depth discussions, completion of the design of various parts of work is finally completed, and the simulation is passed.Finally, its hardware architecture is implemented based on Xilinx Virtex-5 family XC5VLX50T FPGA device in ISE10.1 environment. Final results of synthesis is that the rate of Slice is about 50%, the maximum operating frequency is 200MHz, and the entire design on the ML-561 development board is successfully tested.It is great practical significance of the high-speed pipelined design of discrete Hilbert transformation. It is provided a good condition and accuracy for with for the future three-dimensional spiral CBCT image reconstruction to achieve the overall real-time, and it is competitive and prospected for timeliness and cost.