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1、BLH2AUZE邓建奇1刘东权2周激流1,21 (四川大学电子信息学院,成都610064)2 (四川大学计算机学院,成都610064)K1s1M1ZE,.dZEBt,4ByLH2AUZEbZEi9QM,7|Q_E,yBAUS1a256VbZEaqLC,?TPMAUS4AUsOqb1oM2A Real-time Flow Velocity Estimation Applied to Ultrasound Color DisplayDengJianqi1Liu Dongquan2Zhou Jiliu1,21 (College of Electronic InformationEngineering
2、,Sichuan University, Chengdu610064,China)2 (College of Computer Science, Sichuan University, Chengdu610064,China)AbstractIn this paper the theory of autocorrelation algorithm for color flow mapping is analyzed and a newway for ultrasound color flow velocity estimation and real-timedisplay is propose
3、d. The method sets up a mappingtable which directly relates to thedynamicdisplay range and has only 256 entries using an inverse mapping methodinstead of calculating the arctangent valuedirectly. This method is ideal for softwareimplementation and offers aninteractive way to the user for changing th
4、e dynamic range of flow velocity and thus to increasing the displayresolution.Key wordsColor flow imageColor Doppler ultrasoundColor flow mapping185A=iv%,V2|v%_,s?qN|1bd9(N|(qW%12,V7V|9|(q9bYV2NdSm,V8=83b9,|TmbLVm,iO5WAZ_b-MM9P2|Cro,1M%,7NM9.d9QMf,FQMf,q)1yBvV,ibNAUVU,yN,4ZE,i9QM,7|Q_,gyVUsV1L1W1bN1
5、AUS1,7OV256bN!9VyBd4K(In#L)Z_1bZEaqLC,?TPMAUS4AUsOq,+Y+Y9FAUSb2D2o%h,h?2o|V8FQlo|bo|LcbLN,5C#%Qo|),V/Bmbm1Ub3DJ Biomed Eng2007;24(3)530j533m1mFig1Flow chart of velocityestimation2. 1|hl5Co|)7bBo2|,YVBFIaQ|bBbWMQ,B+nMFI/Q|7|Q2oMM,NlI/Q|,T(1)U:S(n,m) = I(n,m)+ jQ(n,m), 0mM- 1(1)T(1)VU|BTb2. 25Cro1M1,l
6、|(F#5CQo)|byN,4,A1bVF#5CQoqB,sYXY9ND),*Y/XV?02n- 1iBL(ls)b,LUTbWn+ x|%Y/X1/2xbTL!n12 bit,10.0005,x|11,yN9123bitbTLUT8bit,*LUTV18MBi%bWb(2)LUTV,?MbyN,TL=Ms,1vBlu,*dsOqL=b3.2ZE%25,4BZE,Vy9v,7OV!AUSMAUsOqbVatan2lT?,T(6)U:v= atan2(Y,X)=atan(y/x)P+ atan(y/x)- P+ atan(y/x)atan(y/x)x 0,y0;0v 0,y0;- P/2 0,y 0x 0,y0x 0,y 0x 0,y0x 0,y 0(14): CnewT(13)3LUT,Bt2(b- a+ 1)/256b6,S1=(int)(t1), S2= (int)(128t2+ t1) ,S3= (int)( 256t2+t1)b8,BAUSa,b,d|9B1024LUTVCnew,|VUW#S1aS2S3.d,b4LT#)LEV,1yBy/x5323D24KW1,y/xWM,Ks,T(14),VSy/xW1bTd8(color map) ,- PjP 0, 255 ,W50.2567,m3Ubm3S0,255
