Wall Filter for Color Flow TI（壁滤色流）.pdf

Product Brief SPRS642– October 2009 Wall Filter for Color Flow Medical Imaging DSP Applications Team 1 Description The module filters the echoes reflected from tissue and vessel walls, so that velocity is estimated only from the moving red blood cells. This module implements the infinite impulse response (IIR) filtering operation. Since the wall filter module needs to operate with finite number of samples, the transient response of the filter becomes very important. Hence, a state space formulation of the IIR filter is used. This module supports zero, step and projection initialization schemes. Project collateral discussed in this document can be downloaded from the following URL: /sc/techlit/sprs642.zip. 2 Kernel Complexity ( C64x+™ CPU cycles, based on CPU cycle accurate Simulator) 0.49865*D*N*N +4.6849*D*N -20.4024*N + 275.1664 where D = Number of samples per scan-line N = Number of ensembles 3 Cycles on TMS320C6455 EVM The performance is given for several example cases on the C6455 EVM in cycles. The test bench for Color Flow (1D) can be used to find cycles of interest for any other valid configuration. D N Test Case EVM Cycles per Scan-Line 200 10 8 19764 256 32 9 172816 256 16 18 52688 4 Memory The following table shows the memory consump