Ultrasound Database • •
The sampling rate is the number of samples taken per unit of time. In digital signal processing (Nyquist theory) it is necessary to sample twice as fast as the highest frequency component.
![]() Further Reading: Basics:
•
The scattered echo originates from relatively small, weakly reflective, irregularly shaped objects, and is less angle dependent and less intense. The mathematical treatment of non-specular reflection involves the Rayleigh probability density function (i.e. blood cells).
•
The scattering strength is proportional to the sixth power of the radius of the point scatterer, and furthermore inversely proportional to the fourth power of the ultrasound wavelength (i.e., proportional to the fourth power of the ultrasound frequency). The scattering strength of a point scatterer is measured by cross-section scattering. See also Proportionality Constant, Backscattering. • ![]() 'The perfect practice system... The SD 240E is a compact and ergonomically designed system, standard equipped with two probe connectors. The user has a choice out of more than 12 linear, curved and annular phased array probes which can be used with this perfect office unit. Total Image Focus and cine memory technology are just the icing on the cake.' This product is not available in the US, Australia, or New Zealand from Philips Medical Systems.' Specifications for this system will be available soon. |