9.8). The velocity at which aliasing occurs is determined by the Nyquist limit, which is dependent on the frequency of emission of the ultrasound pulses (the pulse repetition frequency) and the frequency of the emitted sound. Many echocardiographic units are equipped with a high pulse repetition ...
Police use dopler radars that only look for Doppler-shifted signals, and because the radar beam is a narrow beam, the radar detection only hits one car. Some police are now using a laser technique to measure the speed of cars. This technique is called lidar, and it uses short pulses of...
was between 72 and 77 kHz, the bats shifted the frequency of the CF component of their own echolocation sounds toward that of the artificial pulse, tracking the frequency of the artificial CF component.Bats flying within a large laboratory flight cage were also presented with artificial pulses. ...
2.The Doppler effect, which detects energy pulses, was discovered by Austrian physicist Christian Doppler and named after him. 3.The tripods also allowed researchers to build a JANUS receiver, advanced versions of which could minimize decoding errors and account for the Doppler effect. ...
20. The method of claim 17, wherein the scanning pulses are wide beams. 21. The method of claim 17, wherein the ultrasonic echoes are received by using a multi-beam technology. 22. A system for simultaneously displaying a B-mode image, a Doppler image, and a color blood flow image...
The times to loss of esophageal doppler sounds and loss of aortic fluctuations were not significantly different. However, they were significantly longer than the time to loss of femoral pulses (P < 0.02).The canine asphyxial EMD model can be used for short experimental studies of pseudo-EMD. ...