ժҪ �����һ�ֶ�ͨ�������ܶȡ��߾������ݲɼ�ϵͳ����Ʒ���.���û����ֳ��ɱ����������(FPGA, Field Programmable Gate Arrays)��Ƕ��˵���ϵ�ṹ,ʵ���˶�ͨ�����ݵĻ��塢��ʽת����ƹ�Ҷ�д����ˮ����,����˶��CT(Computed Tomography)����ɨ��ʱ������������ʱ��Ҫ���ϸ�����ݴ��侫ȷ��Ҫ��ߵ�����;ͬʱ���ø߾��ȵ�ѹԴ�;��ܵ���ģ����ǰ������,����˻���PXI(PCI eXtensions for Instrumentation)���ߵ���������,��ȷ���������ϵͳ��������δ������������.�����ѳɹ�Ӧ���ڶ��CT��,ͬʱҲΪ���ݲɼ��ṩһ�ֽ��.
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.