(RIS) Radiology information system means a computer system that stores and processes the information for a radiology department and can be linked to the hospital information system.
The principal purpose of a RIS consists of taking over the general functions of the administration inclusive planning, monitoring and communication of all data regarding patients and its investigations in the radiology. The correct images should reach, at the correct time, the correct users. For this reason the RIS must contain a workflow management in order to simplify and steer the data flow at the individual view stations or devices (laser cameras etc.). The Radiology Information System is optimally complemented with a Picture Archiving and Communication System (PACS).

RIS Tasks:

Rayleigh scattering is the backscattering of ultrasound from blood. The echoes detected from blood are created through interference between scattered wavelets from numerous point scatterers. Rayleigh Scatterers are objects whose dimensions are much less than the ultrasound wavelength. Rayleigh scattering increases with frequency raised to the 4th power and provides much of the diagnostic information from ultrasound. Doubling the ultrasonic frequency makes the echoes from blood 16 times as strong. The intensity of the backscattered echoes is proportional to the total number of scatterers, which means that the echo amplitude is proportional to the square root of the total number of scatterers.
At normal blood flow, the number of point scatterers in blood is proportional to the number of red blood cells. When blood flow is turbulent, or accelerating fast (e.g. in a stenosis), the number of inhomogeneities in the red blood cell concentration will increase.

See also Scattered Echo.

The reflector is a stationary plate component of a flowprobe used in Doppler ultrasound. Each transducer alternately emits an ultrasound beam which is reflected from this reflector to the receiving transducer. The fixed distance of the reflective pathway is critical to the measurement of the ultrasonic transit time and the accurate measurement of volume flow.

See also Target Strength.

From Siemens Medical Systems;
'The SONOLINE Omnia™ ultrasound system offers mobility, high performance, and ease of use. This digital imaging system delivers excellent 2D, color flow, and Doppler image quality for a variety of general imaging exam types. In addition, the SONOLINE Omnia with cardiac option includes special features that enable use for adult cardiac imaging.'

From Siemens Medical Systems;
'This extremely flexible system supports targeted applications for OB/GYN, Radiology, Internal Medicine, Urology, and Prostate Brachytherapy. The large transducer selection, most with high-frequency capabilities, provides the right tool for general imaging, radiology, and internal medicine applications.'