G - Physics – 01 – F
Patent
G - Physics
01
F
349/39
G01F 1/66 (2006.01) A61B 8/06 (2006.01) G01P 5/24 (2006.01) G01S 15/58 (2006.01)
Patent
CA 1135827
ABSTRACT A method of determining flow velocities by measu- ring the phase difference between Doppler signals deri- ved from wave pulses and reflected by substantially the same reflector at two different times, the interval bet- ween the times being predetermined, a pair of electric signals being derived according to the method from each Doppler signal by modulation in quadrature, the signals jointly bearing information relating to the phase of the Doppler signal, and a device for performing the method. In order to make full use of the possible measuring range, even at a relatively poor signal/noise ratio, at least a first and a second pair of signals (A, B and A', B' respectively) are combined to form a third pair of electric signals (Re, Im) which together bear an item of information depending on the phase difference between the Doppler signals. Mean-value signals (Re, Im) are for- med, each corresponding to the mean value of one of the third pair of signals, and an output signal which cor- responds to the mean value (.DELTA..PHI.) of the phase difference between the Doppler signals is derived from the mean- value signals. It is particularly advantageous to use the method in an ultrasound diagnostic device for determining the velocity profile of a flow, more particularly of blood in a blood vessel.
340350
Gowling Lafleur Henderson Llp
Hoffmann-La Roche Limited
LandOfFree
Determination of flow velocities by measuring phase... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Determination of flow velocities by measuring phase..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Determination of flow velocities by measuring phase... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-775785