The color Doppler method is widely used for velocity imaging, in particular in the medical application of circulatory blood flow visualization. However, the accuracy of medical systems and their… (More)

We investigate topology changing processes in the WKB approximation of four dimensional quantum cosmology with a negative cosmological constant. As Riemannian manifolds which describe quantum… (More)

Recently, the authors described a new algorithm for ultrasonic Doppler imaging and velocity estimation using log-step multicarrier signals. The algorithm achieved a velocity estimation precision that… (More)

We investigate topology-changing processes in 4-dimensional quantum gravity with a negative cosmological constant. By playing the “gluing-polytope game” in hyperbolic geometry, we explicitly… (More)

In airborne acoustic imaging the synthetic transmit aperture (STA) technology is widely used to improve the lateral resolution limited by the aperture of the microphone array. As for an STA system we… (More)

The paper describes a 3D acoustic imaging system that uses a 2D receiver array and a 2D transmitter array. For many years, high quality acoustic imaging has been achieved by using synthetic transmit… (More)