Surgery – Truss – Pad
Patent
1994-12-20
1995-10-31
Manue, George
Surgery
Truss
Pad
A61B 800
Patent
active
054620589
ABSTRACT:
There is provided an ultrasonic diagnostic system wherein received signals are generated in such a manner that ultrasonic pulse beams are transmitted within a subject and reflecting ultrasonic waves from an inside of the subject are received, and a tomographic image is obtained on the basis of the received signals. The ultrasonic diagnostic system is capable of detecting a velocity or a velocity gradient as to the tissue within the subject. Two digital complex signals [R.sub.i (t)+j I.sub.i (t)] and [R.sub.i (t+.DELTA..tau.)+j I.sub.i (t+.DELTA..tau.)], which are apart from each other by .DELTA..tau., are obtained from a complex signal (quadrature detection signal) [h.sub.ci (t)+j h.sub.si (t)] outputted from a complex signal conversion circuit. A phase difference .DELTA..theta..sub.i,i+1 (t) is determined from a complex correlation value C.sub.i,i (t,.DELTA..tau.) of these two complex signals. Further, the phase difference .DELTA..theta..sub.i,i+1 (t) is determined from a complex correlation value C.sub.i,i+1 (t) of signal-to-signal during repetition of transmission of ultrasonic pulse beams. Using these phase differences, time difference .DELTA. t corresponding to a movement quantity within the subject is calculated on the basis of equation:
REFERENCES:
patent: 5268876 (1993-12-01), Rachlin
patent: 5278757 (1994-01-01), Hoctor et al.
patent: 5363851 (1994-11-01), Hall et al.
"Proceeding of the 53rd Meetings of the Japan Society of Ultrasonics in Medicine," Lecture Treatises Collection (JSUM Treatises Collection No. 53), Nov. 1988.
Iizuka Miyuki
Shiba Akira
Yamada Isamu
Fujitsu Limited
Manue George
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