Design of multi-slice CT data acquisition system and its measurement
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摘要: 提出了一种多通道、高密度、高精度数据采集系统的设计方案.采用基于现场可编程逻辑门阵列(FPGA, Field Programmable Gate Arrays)内嵌软核的体系结构,实现了多通道数据的缓冲、格式转换、乒乓读写等流水操作,解决了多层CT(Computed Tomography)有限扫描时间内数据量大、时序要求严格和数据传输精确性要求高的问题;同时利用高精度电压源和精密电阻模拟了前端输入,设计了基于PXI(PCI eXtensions for Instrumentation)总线的虚拟仪器,精确测试了设计系统的性能且未额外引入噪声.方案已成功应用于多层CT中,同时也为数据采集提供一种借鉴.
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关键词:
- 数据采集 /
- 现场可编程逻辑门阵列 /
- 数据处理 /
- 测试
Abstract: A multi-channel, high density and precision real-time DAS(data acquisition system) design approach was presented. It based on the embedded soft core structure, and the real-time signal processing pipeline of multi-channel data buffer, format conversion, coding transmission and ping-pang operation were realized, the problem of more quantities of data, more strict timing sequence and precision of data transmission of multi-slice CT(computed tomography)in limited scan time were solved. Meanwhile, the high precise voltage source and the sensitive registers were used to simulate the input current of DAS. The virtual instrumentation based on PXI(PCI extensions for instrumentation) bus technology was put forward to test the performance of designed DAS, without extra noise involved. The approach has been applied in multi-slice CT, it can also act as an example for data acquisition system reference.-
Key words:
- data acquisition /
- field programmable gate arrays /
- data handling /
- measurements
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